Sigma
BF
Minimalist full-frame L-mount body with large top screen and unique design.
$1,999
Released Apr 2024
Sony
Alpha 7R VI
66.8MP fully-stacked full-frame high-resolution body with 30fps bursts, 8K 30p, 4K 120p, and Sony's new BIONZ XR2 engine.
$4,499
Released Jun 2026
Alpha 7R VI is 2.1 years newer.
Wins
BF
Wins
Alpha 7R VI
2 categories tied
TL;DR — Key differences
- BAlpha 7R VI has higher AF points / zones (759 vs 49)
- BAlpha 7R VI has higher Max video bit rate (600 Mbps vs 150 Mbps)
- BAlpha 7R VI has higher EVF resolution (9,437,184 vs 2,360,000)
- BAlpha 7R VI has higher Resolution (66.8 MP vs 24.2 MP)
- BAlpha 7R VI has higher RAW buffer depth (150 frames vs 60 frames)
Key specs at a glance
Size and weight, to scale
BF
138 × 98 × 88 mm
720 g (1.59 lb / 25.40 oz)
Alpha 7R VI
133 × 97 × 83 mm
713 g (1.57 lb / 25.15 oz)
BF is 5mm wider, 1mm taller, and 5mm thicker than Alpha 7R VI.
BF is 7 g heavier than Alpha 7R VI.
Depth (front-to-back): 88mm BF · 83mm Alpha 7R VI
Back view, to scale
Width × Height — same proportions as the front of the body.
BF
138 × 98 mm
Alpha 7R VI
133 × 97 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
BF
138 × 88 mm
Alpha 7R VI
133 × 83 mm
Sensor size, to scale
BF
36 × 24 mm · Full Frame
864 mm² area
Alpha 7R VI
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
BF: mount data unavailable
Alpha 7R VI
✓ more lensesSony E
350+
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
BF
Dimensions (W×H×D mm)
Adds 138, 98, 88
Card types
Adds SD UHS-II
AA filter
Only BF supports it
Pre-Capture / Pre-Release
Only BF supports it
Weather sealing
Only BF supports it
Battery life (CIPA)
640 shots vs 600 shots — higher is better
Reasons to choose
Alpha 7R VI
AF low-light limit
-6 EV vs -5 EV — lower is better
Dimensions (W×H×D mm)
Adds 132.7, 96.9, 82.9
Card types
Adds CFexpress Type A, SDXC UHS-II
AF points / zones
759 vs 49 — higher is better
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
EVF resolution
9,437,184 vs 2,360,000 — higher is better
Resolution
66.8 MP vs 24.2 MP — higher is better
RAW buffer depth
150 frames vs 60 frames — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Card slots — Both 2
- ✓Touchscreen — Both support touchscreen
Pros & cons at a glance
Editorially curated highlights and trade-offs.
BF
Pros
- ✓Unique design
- ✓Full-frame
- ✓L-mount
Cons
- –No IBIS
- –Niche ergonomics
- –Limited controls
Alpha 7R VI
Pros
- ✓66.8MP fully-stacked Exmor RS sensor
- ✓30fps blackout-free electronic burst
- ✓8K 30p and 4K 120p video
- ✓8.5-stop in-body stabilization
- ✓9.44M-dot HDR OLED EVF
Cons
- –Very expensive
- –Large files demand fast cards and storage
- –8K workflow can be heavy
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for travel, BF or Alpha 7R VI?
BF scores 7.5/10 versus 5.0/10 for Alpha 7R VI — 720g — manageable for travel.
What's the resolution difference between the BF and Alpha 7R VI?
BF is 24.2 MP and Alpha 7R VI is 66.8 MP, so the Alpha 7R VI captures more detail for cropping and large prints.
Do the BF and Alpha 7R VI have in-body image stabilization?
BF has 6-stop in-body image stabilization, while alpha 7R VI has in-body image stabilization.
Which shoots faster bursts — the BF or the Alpha 7R VI?
BF reaches 15 fps electronic. Alpha 7R VI reaches 30 fps electronic.
What's the weight difference between the BF and Alpha 7R VI?
BF weighs 720 g and Alpha 7R VI weighs 713 g, so the Alpha 7R VI is 7 g lighter.
Do the BF and Alpha 7R VI record 4K video?
BF: 4K up to 60p. Alpha 7R VI: 8K (max), 4K up to 120p.
Are the BF and Alpha 7R VI weather sealed?
BF: Yes. Alpha 7R VI: No.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the BF and 600 shots for the Alpha 7R VI, giving the BF the edge.
How much does each cost?
BF launched at $1,999 and Alpha 7R VI at $4,499. The BF is $2,500 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Sigma and Sony press materials.