Sony
FE 50mm F1.2 GM
Sony E Mount
Exquisite resolution and dreamy bokeh combine in a masterful f/1.2 prime.
$1,999
Launch priceReleased Mar 2021
Tamron
17-28mm F2.8 Di III RXD
Leica L Mount
17-28mm F2.8 Di III RXD — 17–28mm f/2.8 for Leica L, a popular choice in the tamron lineup.
$799
Launch priceReleased Jun 2020
FE 50mm F1.2 GM is 9 months newer.
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Wins
FE 50mm F1.2 GM
Wins
17-28mm F2.8 Di III RXD
1 categories tied
TL;DR — Key differences
- AFE 50mm F1.2 GM has lower Max aperture (Wide) (f/1.2 vs f/2.8)
- AFE 50mm F1.2 GM has lower Max aperture (Tele) (f/1.2 vs f/2.8)
- B17-28mm F2.8 Di III RXD has lower Min focus distance (19 cm vs 40 cm)
- B17-28mm F2.8 Di III RXD has lower Weight (438 g vs 778 g)
- B17-28mm F2.8 Di III RXD has lower Length (92 mm vs 108 mm)
Key specs at a glance
Size and weight, to scale
FE 50mm F1.2 GM
⌀87 × 108 mm
778 g (1.72 lb / 27.44 oz)
Credit card
85.6 × 54 mm
for scale
17-28mm F2.8 Di III RXD
⌀80 × 92 mm
438 g (0.97 lb / 15.45 oz)
FE 50mm F1.2 GM is 16mm longer and 7mm wider than 17-28mm F2.8 Di III RXD.
FE 50mm F1.2 GM is 340 g heavier than 17-28mm F2.8 Di III RXD.
Diameter (⌀) is the maximum barrel width; length is measured from the mount to the front of the lens.
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 the FE 50mm F1.2 GM
- ✓
Special elements
Adds 3 XA (extreme aspherical)
- ✓
Max aperture (Wide)
f/1.2 vs f/2.8 — lower is better
- ✓
Max aperture (Tele)
f/1.2 vs f/2.8 — lower is better
- ✓
Control ring
Only FE 50mm F1.2 GM supports it
- ✓
Custom function button
Only FE 50mm F1.2 GM supports it
Reasons to choose the 17-28mm F2.8 Di III RXD
- ✓
Special elements
Adds 1 LD, 2 GM Aspherical
- ✓
Min focus distance
19 cm vs 40 cm — lower is better
- ✓
Weight
438 g vs 778 g — lower is better
- ✓
Length
92 mm vs 108 mm — lower is better
- ✓
Diameter
79.6 mm vs 87 mm — lower is better
- ✓
Max magnification
0.19 × vs 0.17 × — higher is better
Shared specifications
Internal focus
Both support internal focus
Weather sealing
Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
FE 50mm F1.2 GM
Pros
- ✓Outstanding sharpness wide open at f/1.2
- ✓Stunningly smooth, circular bokeh with 11 aperture blades
- ✓Extremely quiet and fast autofocus tracking
- ✓Manageable size and weight for an f/1.2 lens
Cons
- –Expensive investment for a single focal length
- –Heavy compared to standard f/1.8 options
- –Some visible vignetting wide open
17-28mm F2.8 Di III RXD
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Solid optical performance for the price tier
- ✓Native Leica L mount compatibility
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the FE 50mm F1.2 GM and 17-28mm F2.8 Di III RXD at major authorized retailers.
Sony FE 50mm F1.2 GM
Tamron 17-28mm F2.8 Di III RXD
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.