Tamron
17-28mm F2.8 Di III RXD
Sony E Mount
17-28mm F2.8 Di III RXD — 17–28mm f/2.8 for Sony E, a popular choice in the tamron lineup.
$899
Launch priceReleased Jun 2019
Tamron
20-40mm F2.8 Di III VXD
Sony E Mount
20-40mm F2.8 Di III VXD — 20–40mm f/2.8 for Sony E, a popular choice in the tamron lineup.
$699
Launch priceReleased Oct 2022
20-40mm F2.8 Di III VXD is 3.3 years newer.
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Wins
17-28mm F2.8 Di III RXD
Wins
20-40mm F2.8 Di III VXD
6 categories tied
TL;DR — Key differences
- B20-40mm F2.8 Di III VXD has lower Weight (365 g vs 420 g)
- B20-40mm F2.8 Di III VXD has lower Length (101 mm vs 109 mm)
Key specs at a glance
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 17-28mm F2.8 Di III RXD
- ✓
Weather sealing
Only 17-28mm F2.8 Di III RXD supports it
Reasons to choose the 20-40mm F2.8 Di III VXD
- ✓
Weight
365 g vs 420 g — lower is better
- ✓
Length
101 mm vs 109 mm — lower is better
Shared specifications
Max aperture (Wide)
Both f/2.8
Max aperture (Tele)
Both f/2.8
Min focus distance
Both 38 cm
Max magnification
Both 0.25 ×
Internal focus
Both support internal focus
Diameter
Both 86 mm
Pros & cons at a glance
Editorially curated highlights and trade-offs.
17-28mm F2.8 Di III RXD
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Weather-sealed construction for outdoor shooting
- ✓Native Sony E mount compatibility
Cons
- –Third-party or older alternatives may offer better value
20-40mm F2.8 Di III VXD
Pros
- ✓Versatile zoom range covers multiple focal lengths in one lens
- ✓Lightweight design easy to carry all day
- ✓Native Sony E mount compatibility
Cons
- –Third-party or older alternatives may offer better value
Decided which one is right for you?
Compare live prices for the 17-28mm F2.8 Di III RXD and 20-40mm F2.8 Di III VXD at major authorized retailers.
Tamron 17-28mm F2.8 Di III RXD
Tamron 20-40mm F2.8 Di III VXD
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Full specifications
✓ = category winner
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.