Sigma
BF
Minimalist full-frame L-mount body with large top screen and unique design.
$1,999
Released Apr 2024
Sony
Alpha 1 II
50MP stacked flagship with 30fps RAW, 8K video, and Sony's fastest hybrid performance.
$6,499
Released Nov 2024
Alpha 1 II is 7 months newer.
Wins
BF
Wins
Alpha 1 II
3 categories tied
TL;DR — Key differences
- BAlpha 1 II has higher AF points / zones (759 vs 49)
- BAlpha 1 II has higher EVF resolution (9,437,184 vs 2,360,000)
- BAlpha 1 II has higher RAW buffer depth (200 frames vs 60 frames)
- BAlpha 1 II has higher Resolution (50.1 MP vs 24.2 MP)
- BAlpha 1 II has higher Burst (electronic) (30 fps vs 15 fps)
Key specs at a glance
Size and weight, to scale
BF
138 × 98 × 88 mm
720 g (1.59 lb / 25.40 oz)
Alpha 1 II
136 × 97 × 83 mm
743 g (1.64 lb / 26.21 oz)
BF is 2mm wider, 1mm taller, and 5mm thicker than Alpha 1 II.
BF is 23 g lighter than Alpha 1 II.
Depth (front-to-back): 88mm BF · 83mm Alpha 1 II
Sensor size, to scale
BF
36 × 24 mm · Full Frame
864 mm² area
Alpha 1 II
35.9 × 24 mm · Full Frame
862 mm² area
Lens ecosystem
Native lens selection
BF: mount data unavailable
Alpha 1 II
✓ 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
AF low-light limit
-5 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 138, 98, 88
Subject recognition
Adds Vehicle
Battery life (CIPA)
640 shots vs 520 shots — higher is better
Weight
720 g vs 743 g — lower is better
Reasons to choose
Alpha 1 II
Dimensions (W×H×D mm)
Adds 136.1, 96.9, 82.9
AF points / zones
759 vs 49 — higher is better
EVF resolution
9,437,184 vs 2,360,000 — higher is better
RAW buffer depth
200 frames vs 60 frames — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Resolution
50.1 MP vs 24.2 MP — higher is better
Subject recognition
Adds Insect, Car/Train, Airplane
Burst (electronic)
30 fps vs 15 fps — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — 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
- ✓Max video bit rate — Both 150 Mbps
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 1 II
Pros
- ✓50MP stacked sensor
- ✓30fps blackout-free burst
- ✓8K 30p video
- ✓Best Sony AF
Cons
- –Very expensive
- –Complex menus
- –Large files
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, BF or Alpha 1 II?
Alpha 1 II scores 9.5/10 versus 6.0/10 for BF — 8K recording for future-proof footage.
What's the resolution difference between the BF and Alpha 1 II?
BF is 24.2 MP and Alpha 1 II is 50.1 MP, so the Alpha 1 II captures more detail for cropping and large prints.
Do the BF and Alpha 1 II have in-body image stabilization?
BF has 6-stop in-body image stabilization, while alpha 1 II has 8.5-stop in-body image stabilization.
Which shoots faster bursts — the BF or the Alpha 1 II?
BF reaches 15 fps electronic. Alpha 1 II reaches 30 fps electronic.
What's the weight difference between the BF and Alpha 1 II?
BF weighs 720 g and Alpha 1 II weighs 743 g, so the BF is 23 g lighter.
Do the BF and Alpha 1 II record 4K video?
BF: 4K up to 60p. Alpha 1 II: 8K (max), 4K up to 120p.
Are the BF and Alpha 1 II weather sealed?
BF: Yes. Alpha 1 II: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the BF and 520 shots for the Alpha 1 II, giving the BF the edge.
How much does each cost?
BF launched at $1,999 and Alpha 1 II at $6,499. The BF is $4,500 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Sigma and Sony press materials.