Canon DSLR 5D Mark IV Review for Photographers in 2026
Posted by Syed Ebad on
Canon DSLR 5D Mark IV Review Worth Buying in 2026
The Canon EOS 5D Mark IV is a professional full-frame DSLR built around a 30.4MP CMOS sensor, Canon EF lens mount, 61-point viewfinder autofocus system, Dual Pixel CMOS AF, 7fps continuous shooting and dual CompactFlash and SD memory-card slots. Canon introduced it in 2016, yet the camera remains commercially relevant a decade later because Canon still lists the body for sale and continues to provide support resources.
Its position has changed completely. The Canon DSLR 5D Mark IV is no longer the obvious professional Canon body. EOS R mirrorless cameras now bring subject-recognition autofocus, in-body stabilisation, faster bursts, lighter bodies and vastly stronger video tools. The 5D Mark IV now earns its place through EF lens ownership, optical-viewfinder operation, proven DSLR handling, strong battery endurance and dependable still-image quality.
That distinction controls the buying decision. A photographer who already owns several good EF lenses faces a very different financial calculation from someone building a Canon system from nothing.
Quick Verdict
The Canon 5D Mark IV is still worth buying in 2026 for stills-focused photographers who deliberately want a full-frame DSLR or already own valuable EF lenses.
Its 30.4MP sensor remains capable of professional portrait, wedding, studio, landscape and commercial work. The 61-point autofocus system remains dependable within its covered area, the optical viewfinder has no electronic display delay, dual card slots suit paid assignments, and Canon rates viewfinder battery life at approximately 900 shots under its test conditions.
Its age appears clearly in five areas:
- No in-body image stabilisation
- Fixed rear screen
- 7fps maximum continuous shooting
- Older subject-tracking intelligence
- Heavily compromised 4K workflow
Someone beginning a Canon full-frame system in 2026 should normally start with EOS R. The 5D Mark IV becomes much more convincing when EF lenses already occupy the camera bag.
Canon EOS 5D Mark IV Key Facts
- Camera type: Full-frame DSLR
- Sensor: 30.4MP CMOS
- Processor: DIGIC 6+
- Lens mount: Canon EF
- Viewfinder autofocus: 61 points with up to 41 cross-type points depending on lens
- Live View autofocus: Dual Pixel CMOS AF
- Continuous shooting: Up to 7fps
- ISO: 100–32,000, expandable to 50–102,400
- Screen: Fixed 3.2-inch 1.62-million-dot touchscreen
- Video: DCI 4K up to 30p/25p depending on video system
- 4K codec: Motion JPEG at approximately 500Mbps
- Memory: CompactFlash UDMA7 plus SD/SDHC/SDXC UHS-I
- Battery: LP-E6N or LP-E6
- Battery rating: Approximately 900 viewfinder shots at 23°C
- Body weight: Approximately 800g without battery and cards; approximately 890g in Canon's tested shooting configuration
- Connectivity: Wi-Fi, NFC and GPS
- Body stabilisation: None
- Current firmware: Canon lists firmware 1.4.0 as the latest published update in its support material.
Why the 5D Mark IV Still Has a Place in 2026
The 5D Mark IV remains relevant because image quality does not become obsolete at the same speed as autofocus and video technology.
A well-exposed 30.4MP RAW file from the 5D Mark IV still contains enough resolution for substantial prints, commercial web delivery, wedding albums, portrait work and moderate cropping. The camera also represented a major dynamic-range improvement for Canon DSLRs when its on-sensor analogue-to-digital design arrived. Independent technical testing showed far cleaner shadow recovery than earlier 5D generations.
The physical camera also remains highly developed. Canon had already spent several generations refining the 5D control layout. A deep grip, rear control wheel, top LCD, joystick, dedicated AF controls and optical viewfinder provide a direct working environment that still suits photographers accustomed to professional DSLRs.
Norwich Cameras currently lists the Canon EOS 5D Mark IV Body, reinforcing the unusual fact that this is an older platform still available as a new camera in 2026.
Its continued availability should not be confused with Canon's future development direction. That direction is clearly EOS R.
The 30.4MP Sensor Still Produces Serious Professional Files
Thirty megapixels remains a useful resolution level because it balances detail against file size.
The 5D Mark IV records 6720 × 4480-pixel large RAW and JPEG files. That provides enough resolution for detailed portraits, product photography, landscape prints and moderate cropping without generating the heavier storage burden of today's 45MP-plus cameras. Canon specifies 14-bit RAW recording.
The sensor's improvement over the 22.3MP 5D Mark III is more significant than the numbers alone suggest. The linear resolution increase gives more room for cropping, and the newer sensor architecture substantially improved low-ISO shadow recovery compared with the preceding generation.
High-resolution mirrorless bodies have moved much further. The Canon EOS R5 Mark II now provides 45MP from a back-illuminated stacked sensor. Photographers producing large commercial crops, wildlife enlargements or high-detail advertising work gain real value from that extra resolution.
Most wedding albums, online commercial work and portrait deliveries do not automatically need 45MP. The 5D Mark IV's 30.4MP files can remain easier to process in high-volume workflows.
An Optical Viewfinder Creates a Different Shooting Experience
The optical viewfinder is one of the most legitimate reasons to buy the 5D Mark IV intentionally.
A DSLR viewfinder shows light travelling directly through the lens and optical system. There is no electronic refresh rate, display resolution or processing delay between the scene and your eye.
That can feel particularly natural during long wedding days, sports coverage, documentary work and outdoor photography. The camera can also remain at your eye for extended periods without constantly powering an electronic display.
The trade-off is lost preview information.
An electronic viewfinder can show exposure, white balance, picture style and depth-of-field effects before the photograph is captured. Modern mirrorless cameras can also overlay subject detection and tracking information directly across a much wider part of the frame.
The mirrorless camera range therefore offers a more information-rich experience, but photographers who prefer direct optical viewing can still see the 5D Mark IV as a feature-driven purchase instead of an outdated one.
Where the 61-Point Autofocus System Still Works Well
The 5D Mark IV's viewfinder autofocus remains capable for portraits, weddings, events and moderate action when the subject stays within its AF coverage.
Canon gives the body 61 viewfinder AF points, with up to 41 cross-type points depending on the attached lens. The centre point operates down to -3 EV under Canon's specified conditions, and the camera's 150,000-pixel RGB+IR metering sensor contributes subject information to viewfinder tracking.
Single-point AF can remain highly dependable. Independent testing of the system during moving-subject work found extremely high accuracy when the photographer maintained the selected point over the subject.
Live View uses Dual Pixel CMOS AF and can focus down to -4 EV under Canon's stated conditions. Touch focus is particularly useful for tripod portraits, product work and controlled compositions.
The age appears in subject recognition. The 5D Mark IV does not provide the modern person, animal, bird and vehicle recognition found in Canon's current Dual Pixel CMOS AF II bodies.
The Canon EOS R6 Mark III Body uses modern subject tracking and can register priority faces for event work. That reduces the amount of AF-point management demanded from the photographer.
Seven Frames Per Second Is Enough for Some Action but No Longer Fast
Seven frames per second still captures usable action sequences, but it no longer qualifies as high-speed performance in Canon's current system.
The 5D Mark IV can handle children, ceremonies, moderate wildlife, documentary action and many sports situations where the photographer anticipates the moment. Its viewfinder remains responsive and startup is effectively immediate. Canon specifies continuous shooting up to 7fps.
Modern mirrorless technology changes the scale.
The EOS R6 Mark III reaches up to 40fps with its electronic shutter and can capture frames before the shutter is fully pressed through pre-continuous shooting. Canon also specifies an expanded buffer reaching up to 150 RAW images with supported CFexpress media.
That difference becomes visible with birds in flight, unpredictable sport and fast wildlife.
A photographer shooting portraits, architecture or weddings does not automatically need 40fps. Seven frames per second remains adequate for many assignments, and lower burst volume also reduces culling and storage pressure.
Dual Card Slots and Long Battery Life Still Protect Paid Work
Professional reliability is one area where the 5D Mark IV remains easy to understand.
The body contains one CompactFlash slot and one SD slot. Canon permits several recording configurations, allowing images to be stored across the two cards for capacity or backup purposes.
The media itself is old. CompactFlash UDMA7 and UHS-I SD are much slower than current CFexpress Type B and UHS-II combinations.
The practical benefit is redundancy, not speed.
Wedding photographers, event shooters and commercial teams can retain a second in-camera copy when a paid assignment cannot be recreated.
Battery endurance also remains strong. Canon rates approximately 900 still images using the optical viewfinder at 23°C with an LP-E6N battery. Live View drops the rating to around 300 images because the sensor and rear display remain powered.
That difference illustrates one overlooked DSLR advantage: optical viewing consumes far less power than keeping a sensor and electronic finder active continuously.
No IBIS Changes the Lens Strategy
The 5D Mark IV does not stabilise the sensor, so handheld stabilisation depends on the lens.
That distinction matters far more in 2026 because current Canon mirrorless bodies integrate in-body image stabilisation with compatible lenses. Canon rates the R6 Mark III system at up to 8.5 stops under specified conditions.
A 5D Mark IV user working with an unstabilised Canon EF 35mm f/1.4L II USM receives no camera-based shake correction. Faster shutter speeds, a wider aperture, higher ISO or physical support become necessary as light falls.
A stabilised EF zoom changes the situation. The 5D Mark IV paired with an EF 24-105mm F4L IS II gains lens-based optical stabilisation, making handheld static subjects easier at slower shutter speeds.
Stabilisation still does not freeze a moving person. A wedding guest walking across a dim reception room requires enough shutter speed regardless of IBIS.
EF Lens Ownership Is the Biggest Reason to Buy a 5D Mark IV
The financial case for the 5D Mark IV becomes strongest once good EF lenses are already owned.
Canon EF is one of the deepest mature DSLR lens systems ever produced. Professional zooms, fast primes, macro lenses and super-telephotos remain available across new and used markets. Norwich Cameras' current Canon lenses coverage still includes extensive discussion of EF alongside RF because older glass remains relevant.
An existing working kit might contain:
- Canon EF 24-70mm f/2.8L II USM
- Canon EF 50mm f/1.2L USM
- Canon EF 35mm f/1.4L II USM
- 70-200mm professional zoom
- 100mm macro
- 100-400mm telephoto
Replacing a body is one financial event. Replacing an entire professional lens kit can cost much more.
This is where the 5D Mark IV can beat a technically superior mirrorless camera financially. The DSLR allows those lenses to remain native, balanced around the body and free from an adapter.
The wider camera lens collection also shows how rapidly current lens investment has shifted towards newer mirrorless mounts. Someone building from zero should account for that direction before committing heavily to EF.
The 5D Mark IV With a 24-105mm F4L II as a Complete Working Kit
The Canon EOS 5D Mark IV Kit with 24-105mm f/4L II remains one of the most logical configurations for a photographer who specifically wants the DSLR.
A 24-105mm standard zoom covers wide environmental scenes, documentary framing, normal perspectives, portraits and tighter details without frequent lens changes. The constant F4 aperture keeps exposure behaviour consistent through the zoom range, and lens-based stabilisation compensates for the body having no IBIS.
Wedding photographers can cover groups, room details, candids and portraits. Travel photographers gain one broad focal range. Commercial photographers can use the same combination for environmental images, people and general brand content.
F4 is the compromise.
A Canon EF 24-70mm f/2.8L II USM gathers twice as much light at F2.8 as an F4 lens under matching conditions and provides shallower depth of field. The price is shorter reach and no built-in stabilisation on that particular EF 24-70mm design.
Lens priority should follow the assignment.
4K Video Is the Area Where the 5D Mark IV Has Aged Most
The 5D Mark IV records genuine DCI 4K, but its implementation now creates serious production limitations.
Canon records 4096 × 2160 4K using Motion JPEG at approximately 500Mbps. Frame rates reach 29.97p, 25p, 24p or 23.98p depending on the selected system.
The camera uses a central sensor region for 4K. Canon's own training material describes the resulting field-of-view effect as approximately 1.74x relative to the indicated full-frame focal length. That turns wide-angle lenses into noticeably tighter video tools.
Other restrictions matter more in 2026:
- No 4K 50p or 60p
- No in-body stabilisation
- Fixed rear screen
- Very high 4K bitrate
- HDMI video output is limited compared with current cinema workflows
- Modern open-gate and internal RAW options are absent
- One clip stops after 29 minutes 59 seconds
Dual Pixel CMOS AF remains useful for focus transitions and face tracking in Live View, and Canon Log exists on compatible upgraded versions. Canon still lists a dedicated 5D Mark IV configuration with Canon Log.
A photographer recording occasional clips can work around the limitations.
A filmmaker building a new production system should start elsewhere.
500Mbps Motion JPEG Creates a Surprisingly Heavy Storage Workflow
The 5D Mark IV's 4K codec creates one of its least obvious ownership costs.
A 500Mbps data rate equals approximately 62.5MB every second. That is roughly:
- 3.75GB per minute
- 112GB for a 29 minute 59 second clip
- 225GB for one hour of accumulated 4K footage
Canon's own published recording information lists the 4K bitrate at approximately 500Mbps.
This was a quality-focused approach in 2016 because every video frame is stored as an individual JPEG image. It is inefficient by modern standards.
The storage consequence extends past the memory card. A day containing two hours of 4K material approaches 450GB before backups. Two backup copies can push that one day's storage footprint beyond a terabyte once project files and exports are included.
Current cameras can provide more advanced colour, higher frame rates and more efficient codecs without forcing the same data rate for routine 4K recording.
For 5D Mark IV owners, Full HD remains much easier to manage when 4K resolution adds little to the final delivery.
Wedding and Event Photography Still Suit the 5D Mark IV
Weddings remain one of the strongest use cases for the 5D Mark IV.
Thirty megapixels gives enough detail for albums and cropping. The optical viewfinder supports long shooting days. Dual cards protect paid images. Battery life remains strong, and EF includes decades of event-ready lenses.
The camera pairs naturally with bright professional glass. A 24-70mm F2.8 can cover most of a ceremony and reception, with a 70-200mm adding distance and compression. A prime lens can add a brighter aperture for dark venues and more pronounced subject separation.
Modern wedding cameras reduce operational risk further through subject-recognition AF, IBIS and much faster electronic shooting. The R6 Mark III can register important faces and prioritise them during autofocus, which is highly relevant when the couple has to remain the primary subject within crowded scenes.
The 5D Mark IV remains workable. Modern mirrorless bodies reduce the skill needed to maintain focus under pressure.
Portrait and Studio Photographers Can Still Make a Strong Case
Portrait work exposes fewer of the 5D Mark IV's age-related weaknesses.
A subject sitting in controlled light does not need 40fps capture. Studio flash removes the need for IBIS in many situations. Thirty megapixels provides substantial detail without producing the heavier files of a 45MP body.
The EF lens system remains particularly appealing here.
The Canon EF 50mm f/1.2L USM provides a fast standard perspective with shallow depth of field, and the Canon EF 35mm f/1.4L II USM works well for environmental portraits and wider editorial scenes.
Live View Dual Pixel AF can also be used during tripod-based portrait work, though the fixed LCD makes low and high camera positions less convenient than a vari-angle mirrorless screen.
A studio photographer already invested in EF lenses and flash equipment has little reason to replace a functioning 5D Mark IV solely because newer autofocus exists.
Landscape Photography Benefits From Resolution but Not the Weight
The 5D Mark IV still produces strong landscape files through its 30.4MP full-frame sensor and improved low-ISO dynamic range.
Tripod work also removes several mirrorless advantages. Burst speed carries little value, and lack of IBIS becomes less important once the camera is physically supported.
EF provides strong landscape optics across ultra-wide zooms and primes. The camera's built-in GPS can record location information, which remains useful for travel and repeated landscape projects.
Weight creates the larger objection.
Canon lists the 5D Mark IV at about 890g with battery and cards. A modern R6 Mark III is approximately 699g with battery and card, producing a difference close to 200g before a lens is attached.
That becomes noticeable on long hikes.
Photographers prioritising resolution, stabilisation and reduced body weight can use the broader best camera for landscape photography assessment to see where newer high-resolution mirrorless systems provide stronger field advantages.
Wildlife Photography Exposes the Generational Gap
The 5D Mark IV can photograph wildlife effectively, but current subject-tracking technology changes the experience considerably.
Seven frames per second can capture a bird taking off or an animal running when timing is good. The 61-point system can track motion accurately when the photographer keeps the AF area on the subject.
Modern mirrorless cameras remove more of that burden.
The R6 Mark III provides dedicated animal recognition, electronic capture up to 40fps and pre-continuous recording. That can preserve frames from just before full shutter activation.
The 5D Mark IV still makes sense for larger animals, controlled wildlife, slower subjects and photographers with valuable EF telephotos.
Fast birds and unpredictable action provide a much stronger reason to migrate.
A wider professional photography camera assessment should therefore treat the 5D Mark IV as a specialist legacy-system option, not the current benchmark for action photography.
Moving EF Lenses to EOS R Can Protect Existing Investment
Moving to mirrorless does not automatically require replacing every EF lens.
Canon's EOS R bodies can use compatible EF and EF-S lenses through an EF-EOS R adapter. Canon states that the adapter maintains electronic communication for autofocus and lens operation.
Norwich Cameras lists the Canon Control Ring Mount Adapter EF-EOS R, which adds a configurable control ring as well as the physical EF-to-R connection.
This creates a useful staged migration:
- Keep existing EF lenses.
- Move to an EOS R body.
- Adapt existing glass.
- Replace individual lenses with RF versions only when a real benefit appears.
The Canon RF lenses range then becomes a long-term route instead of an immediate replacement bill.
This migration path weakens one historical argument for staying with a DSLR: EF investment can continue delivering value on EOS R.
The remaining DSLR advantages become optical viewing, handling preference, battery behaviour and a potentially lower body cost.
5D Mark IV or EOS R6 Mark III
The EOS R6 Mark III is the technically stronger all-round camera for a new purchase.
Canon gives it:
- 32.5MP full-frame sensor
- Up to 40fps electronic shooting
- Dual Pixel CMOS AF II
- Person, animal and vehicle recognition
- In-body stabilisation
- CFexpress Type B plus UHS-II SD
- 7K RAW video
- Open Gate recording
- Vari-angle display
- Approximately 699g shooting weight
The 5D Mark IV answers with:
- Optical viewfinder
- Native EF lens mount
- 30.4MP still files
- Familiar DSLR control layout
- Strong optical-viewfinder battery endurance
- CF plus SD dual-card recording
- Mature EF lens ecosystem
The best Canon camera in 2026 is therefore not automatically the newer body for every existing owner. A photographer with £5,000 or £10,000 invested in EF lenses can rationally value compatibility more heavily than autofocus advances.
A photographer starting from nothing should normally build around EOS R.
Norwich Cameras' wider assessment of Canon mirrorless cameras provides the relevant modern system context.
Take the EOS R5 Mark II Route for Resolution and Hybrid Work
The Canon EOS R5 Mark II Body is the stronger Canon route for photographers who genuinely need more resolution and more advanced hybrid capability.
Its 45MP back-illuminated stacked sensor delivers substantially greater cropping freedom than the 5D Mark IV's 30.4MP sensor. Canon also provides electronic shooting up to 30fps and advanced 8K RAW video.
Those features carry workflow costs.
More resolution increases storage use and editing demand. Advanced video requires faster media and substantially more post-production capacity. The R5 Mark II also moves the photographer into the RF system for native lens growth.
The extra capability makes sense for high-resolution commercial work, demanding wildlife, sport and serious hybrid production.
A portrait photographer delivering normal-size client files gains less from the jump.
Buying a 5D Mark IV in 2026 Requires a Different Mindset
A new 5D Mark IV purchase is now a deliberate legacy-system decision.
That is not automatically negative.
Mature systems can provide excellent value because the technical behaviour is well understood, accessories are plentiful, batteries are established and lens options extend across many generations.
The risks are different.
Future Canon development is concentrated on RF. The 5D Mark IV will not gain modern subject-recognition AF, IBIS or new video architecture through firmware. New professional EF lens development has effectively given way to RF system development.
Anyone buying used should inspect:
- General body condition
- Lens mount
- Card doors and slots
- CF pins
- SD slot operation
- USB and HDMI ports
- Rear LCD
- Viewfinder
- Buttons and control wheels
- Autofocus consistency
- Sensor condition
- Battery health
- Weather-sealing surfaces
- History of impacts or moisture
- Current firmware
Canon's support pages still contain recent manuals and firmware resources, and firmware 1.4.0 remains the current published firmware notice.
Who Should Buy the Canon EOS 5D Mark IV?
The Canon EOS 5D Mark IV still makes strong sense for:
Existing Canon EF lens owners
Native EF compatibility can preserve a substantial existing lens investment.
Wedding and event photographers comfortable with DSLR operation
Dual cards, strong battery endurance and dependable still-image quality remain useful.
Portrait photographers
The 30.4MP sensor and mature EF prime system remain highly capable.
Studio photographers
Controlled light reduces the importance of IBIS, extreme burst speed and subject tracking.
Photographers who prefer an optical viewfinder
Mirrorless technology cannot reproduce the exact direct optical viewing experience.
Commercial photographers producing moderate-resolution output
Thirty megapixels remains enough for many client deliverables.
Photographers purchasing a second matching body
Existing 5D Mark IV users may gain more operational consistency from another identical body than from mixing two control systems.
Who Should Avoid It?
The 5D Mark IV is a weak starting point for several buyers.
New Canon system owners should normally begin with RF because future body and lens development centres on EOS R.
Fast wildlife and sports photographers gain major operational benefits from modern subject recognition, pre-capture and high electronic burst rates.
Video-first creators should avoid building a new workflow around 500Mbps Motion JPEG 4K, a central sensor crop and a fixed rear screen.
Handheld low-light photographers relying on unstabilised lenses gain more flexibility from an IBIS-equipped body.
Photographers prioritising low carry weight should account for the 890g shooting weight before lenses.
Hybrid photographers moving constantly between stills and video gain substantially more from current EOS R bodies.
Final Buying Advice
The Canon DSLR 5D Mark IV remains worth buying in 2026 when the purchase protects an existing EF system or fulfils a deliberate preference for DSLR photography.
The 30.4MP sensor still produces professional files. Its optical viewfinder remains direct and responsive. Dual memory cards suit paid work. Battery endurance remains a genuine advantage. EF lens access can reduce total system cost dramatically for photographers already invested in Canon DSLR glass.
Its strongest limitation is not image quality. It is system age.
Autofocus intelligence, stabilisation, high-speed capture and video have moved far beyond the 5D Mark IV. The EOS R6 Mark III is therefore the stronger all-round purchase for a photographer entering Canon full frame now. The R5 Mark II becomes the stronger route for higher resolution and demanding hybrid production.
Spending less on the 5D Mark IV can make good financial sense when EF lenses are already owned and still photography dominates the workload.
Spending more on EOS R makes sense when the camera needs to remain at the centre of a growing Canon system for several years.
Frequently Asked Questions
Is the Canon 5D Mark IV still worth buying in 2026?
Yes, primarily for stills-focused photographers with existing EF lenses or a strong preference for DSLR operation. Its 30.4MP sensor, dual cards, 61-point autofocus and optical-viewfinder battery endurance remain useful. A new system buyer gains a stronger long-term path from EOS R.
Is the Canon 5D Mark IV a professional camera?
Yes. Canon continues to classify the EOS 5D Mark IV within its professional DSLR range. Its full-frame sensor, dual memory cards, substantial body, advanced controls and professional EF lens compatibility support paid photography.
Does the Canon 5D Mark IV have image stabilisation?
The body does not have in-body image stabilisation. Stabilisation comes from compatible EF lenses containing Canon's optical Image Stabilizer.
Can the Canon 5D Mark IV use EF-S lenses?
No. Canon specifies compatibility with EF lenses and excludes EF-S and EF-M lenses from direct use on the 5D Mark IV.
Is the Canon 5D Mark IV good for weddings?
Yes. It remains effective for weddings through its 30.4MP full-frame files, strong battery endurance, dual memory cards and established EF event lenses. Newer EOS R bodies provide stronger subject tracking and stabilisation.
Is the Canon 5D Mark IV good for video?
It can produce useful video, but its 4K workflow is dated. DCI 4K reaches 30p/25p depending on region, uses a central sensor crop and records Motion JPEG at about 500Mbps. Current hybrid and cinema cameras are much more practical for serious video production.
How much storage does 5D Mark IV 4K video use?
At approximately 500Mbps, footage uses around 3.75GB per minute and roughly 225GB per accumulated hour. A maximum-length 29 minute 59 second clip can approach 112GB.
Does the Canon 5D Mark IV have dual card slots?
Yes. It has one CompactFlash UDMA7 slot and one SD/SDHC/SDXC slot supporting UHS-I cards. UHS-II cards are not supported at UHS-II speeds.
Can EF lenses move from a 5D Mark IV to an EOS R camera?
Compatible EF lenses can work on EOS R bodies through an EF-EOS R mount adapter. This provides a practical migration path for photographers moving from DSLR to Canon mirrorless.