The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 11-20mm F2.8 RF and the Tamron 17-28mm F2.8 Di III for their suitability to various photography scenarios:
Size and Weight Comparison The size of a lens is a crucial factor to consider when comparing two lenses. Tamron 17-28mm F2.8 Di III is the longer of the two lenses at 99mm. The Tamron 11-20mm F2.8 RF with a length of 84mm, is 15mm shorter. On the other hand, there is no difference between the max diameters of these lenses, both coming at 73mm.
Below you can find a scaled side-by-side image of Tamron 11-20mm F2.8 RF and Tamron 17-28mm F2.8 Di III to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 11-20mm F2.8 RF and the Tamron 17-28mm F2.8 Di III Size and Weight The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Tamron 11-20mm F2.8 RF weighs 340g, which means it is 80g (19%) lighter than the Tamron 17-28mm F2.8 Di III which has a weight of 420g.
Filter Threads
Both the Tamron 11-20mm F2.8 RF and the Tamron 17-28mm F2.8 Di III have the same Filter thread size of 67mm .
Below are links to the 67mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Tamron 11-20mm F2.8 RF has the Canon RF lens mount whereas the Tamron 17-28mm F2.8 Di III has the Sony E lens mount . Some of the latest released cameras that are compatible with these mounts are Canon R50 V , Canon R100 and Canon R50 for the Canon RF Mount and Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount.
Focal Range
Tamron 11-20mm F2.8 RF has a focal range of 11-20mm and
1.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
17.6-32mm when used on a APS-C / DX format camera.
On the other hand, the Tamron 17-28mm F2.8 Di III has a focal range of 17-28mm and 1.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 25.5 - 42mm .
