Tamron 17-28mm F/2.8 Di III RXDvsTamron 20mm F/2.8 Di III OSD M1:2
17-28mm F/2.8 Di III RXD
17-28mm / F2.8
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20mm F/2.8 Di III OSD M1:2
20mm / F2.8
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Which to choose
When the 17-28mm F/2.8 Di III RXD suits you better
- Zoom rangeCovers 17-28mm in a single lens
When the 20mm F/2.8 Di III OSD M1:2 suits you better
- Weight200g lighter, so easier to carry
- Close focusFocuses as close as 11cm
These points are derived mechanically from the numbers. How a lens actually renders does not show up in specifications, so look at samples before deciding.
Size compared
- 17-28mm F/2.8 Di III RXD99mm long × 73mm diameter
- 20mm F/2.8 Di III OSD M1:264mm long × 73mm diameter
Specifications compared
| Specification | Tamron 17-28mm F/2.8 Di III RXD | Tamron 20mm F/2.8 Di III OSD M1:2 | Difference |
|---|---|---|---|
| Focal length (wide) | 17mm | 20mm | −3mm |
| Focal length (tele) | 28mm | 20mm | +8mm |
| Max aperture (wide) | F2.8 | F2.8 | — |
| Max aperture (tele) | F2.8 | F2.8 | — |
| Min aperture | F22 | F22 | — |
| Min focus distance | 19cm | 11cm | +0.08m |
| Max magnification | 0.19× | 0.50× | −0.31x |
| Aperture blades | 9blades | 7blades | +2blades |
| Weight | 420g | 220g | +200g |
| Length | 99mm | 64mm | +35mm |
| Diameter | 73mm | 73mm | — |
| Filter size | 67mm | 67mm | — |
| Released | 2019 | 2019 | — |
| Stabilization | No | No | — |
| Weather sealing | Yes | Yes | — |
| Macro | No | No | — |
| Autofocus | Yes | Yes | — |
The difference column reads as 17-28mm F/2.8 Di III RXD relative to 20mm F/2.8 Di III OSD M1:2.The highlighted cell is the better side for that specification.
Check prices
17-28mm F/2.8 Di III RXD
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20mm F/2.8 Di III OSD M1:2
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17-28mm F/2.8 Di III RXD in detail20mm F/2.8 Di III OSD M1:2 in detailAll E-mount lenses