Canon
EOS R7
32.5MP APS-C RF-mount body with 30fps burst, 4K 60p, 7-stop IBIS, and advanced subject tracking.
$1,499
Launch priceReleased May 2022
Pentax
K-3 Mark III
APS-C DSLR flagship with optical viewfinder and weather sealing.
$1,999
Launch priceReleased Apr 2021
EOS R7 is 1.1 years newer.
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Wins
EOS R7
Wins
K-3 Mark III
4 categories tied
Which would you choose?
TL;DR — Key differences
- AEOS R7 has higher AF points / zones (651 vs 101)
- BK-3 Mark III has higher RAW buffer depth (120 frames vs 42 frames)
- AEOS R7 has higher Max video bit rate (340 Mbps vs 150 Mbps)
- AEOS R7 has higher Burst (mechanical) (15 fps vs 8 fps)
- BK-3 Mark III has higher EVF resolution (3,690,000 vs 2,360,000)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
EOS R7
132 × 90 × 92 mm
612 g (1.35 lb / 21.59 oz)
Credit card
85.6 × 54 mm
for scale
K-3 Mark III
138 × 98 × 88 mm
520 g (1.15 lb / 18.34 oz)
EOS R7 is 6mm narrower and 8mm shorter than K-3 Mark III but it is also 4mm thicker.
EOS R7 is 92 g heavier than K-3 Mark III.
Depth (front-to-back): 92mm EOS R7 · 88mm K-3 Mark III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R7
132 × 90 mm
Credit card
85.6 × 54 mm
K-3 Mark III
138 × 98 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R7
132 × 92 mm
Credit card
85.6 × 54 mm
K-3 Mark III
138 × 88 mm
Sensor size, to scale
EOS R7
22.3 × 14.8 mm · APS-C
330 mm² area
K-3 Mark III
23.5 × 15.6 mm · APS-C
367 mm² area
1.1× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
EOS R7
✓ more lensesCanon RF
105+
native lenses available
K-3 Mark III
Pentax K
70+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
EOS R7
AF low-light limit
-5 EV vs -3 EV — lower is better
Dimensions (W×H×D mm)
Adds 132, 90.4, 91.7
Card types
Adds SD, SDHC, SDXC
AF points / zones
651 vs 101 — higher is better
Codecs
Adds AAC, LPCM
Max video bit rate
340 Mbps vs 150 Mbps — higher is better
AA filter
Only EOS R7 supports it
Burst (mechanical)
15 fps vs 8 fps — higher is better
Reasons to choose
K-3 Mark III
Dimensions (W×H×D mm)
Adds 138, 98, 88
Card types
Adds SD UHS-II
RAW buffer depth
120 frames vs 42 frames — higher is better
Codecs
Adds H.264
EVF resolution
3,690,000 vs 2,360,000 — higher is better
Weight
520 g vs 612 g — lower is better
4K max frame rate
60 fps vs 59.94 fps — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R7
Pros
- ✓High-resolution 32.5MP APS-C sensor
- ✓Up to 30fps electronic burst
- ✓7-stop in-body stabilization
- ✓Dual SD UHS-II card slots
- ✓Strong value for wildlife and sports reach
Cons
- –APS-C sensor trails full-frame in low-light depth
- –RF-S lens lineup is still limited
- –4K 60p uses a crop in some modes
K-3 Mark III
Pros
- ✓Optical viewfinder
- ✓Weather sealed
- ✓IBIS in DSLR
Cons
- –DSLR system declining
- –APS-C
- –Limited video
Decided which one is right for you?
Compare live prices for the EOS R7 and K-3 Mark III at major authorized retailers.
Canon EOS R7
Pentax K-3 Mark III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, EOS R7 or K-3 Mark III?
K-3 Mark III scores 6.0/10 versus 3.5/10 for EOS R7 — 4K recording.
What's the resolution difference between the EOS R7 and K-3 Mark III?
EOS R7 is 32.5 MP and K-3 Mark III is 25.7 MP, so the EOS R7 captures more detail for cropping and large prints.
Do the EOS R7 and K-3 Mark III have in-body image stabilization?
EOS R7 has 8-stop in-body image stabilization, while K-3 Mark III has 7-stop in-body image stabilization.
Which shoots faster bursts — the EOS R7 or the K-3 Mark III?
EOS R7 reaches 30 fps electronic. K-3 Mark III reaches 20 fps electronic.
What's the weight difference between the EOS R7 and K-3 Mark III?
EOS R7 weighs 612 g and K-3 Mark III weighs 520 g, so the K-3 Mark III is 92 g lighter.
Do the EOS R7 and K-3 Mark III record 4K video?
EOS R7: 4K up to 59.94p. K-3 Mark III: 4K up to 60p.
Are the EOS R7 and K-3 Mark III weather sealed?
EOS R7: Yes. K-3 Mark III: Yes.
Which has better battery life?
Rated battery life is 660 shots (CIPA) for the EOS R7 and 640 shots for the K-3 Mark III, giving the EOS R7 the edge.
How much does each cost?
EOS R7 launched at $1,499 and K-3 Mark III at $1,999. The EOS R7 is $500 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way EOS R7 vs K-3 Mark III vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.
Product images courtesy of Canon and Pentax press materials.