The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 17-28mm F2.8 Di III and the Tamron 15-30mm f2.8 VC USD 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 15-30mm f2.8 VC USD is the longer of the two lenses at 145mm. The Tamron 17-28mm F2.8 Di III with a length of 99mm, is 46mm shorter. Besides being longer, the Tamron 15-30mm f2.8 VC USD also has a larger diameter of 98mm compared to the Tamron 17-28mm F2.8 Di III's 73mm diameter.
Below you can find a scaled side-by-side image of Tamron 17-28mm F2.8 Di III and Tamron 15-30mm f2.8 VC USD to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 17-28mm F2.8 Di III and the Tamron 15-30mm f2.8 VC USD 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 17-28mm F2.8 Di III weighs 420g, which means it is 680g (61%) lighter than the Tamron 15-30mm f2.8 VC USD which has a weight of 1100g.
Lens Mounts
The Tamron 17-28mm F2.8 Di III has the Sony E lens mount whereas the Tamron 15-30mm f2.8 VC USD has the Sony Alpha lens mount . Some of the latest released cameras that are compatible with these mounts are Sony FX5 , Sony A7R VI and Sony A7 V for the Sony E Mount and Sony A99 II , Sony A68 and Sony A77 II for the Sony Alpha Mount.
Canon EF and Nikon F (FX) mounts.
Focal Range
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 .
On the other hand, the Tamron 15-30mm f2.8 VC USD has a focal range of 15-30mm and 2.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 22.5 - 45mm .
