The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Tamron 20-40mm F2.8 VXD and the Tamron 17-35mm F2.8-4 Di OSD 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 17-35mm F2.8-4 Di OSD is the longer of the two lenses at 93mm. The Tamron 20-40mm F2.8 VXD with a length of 86mm, is 7mm shorter. Besides being longer, the Tamron 17-35mm F2.8-4 Di OSD also has a larger diameter of 84mm compared to the Tamron 20-40mm F2.8 VXD's 74mm diameter.
Below you can find a scaled side-by-side image of Tamron 20-40mm F2.8 VXD and Tamron 17-35mm F2.8-4 Di OSD to get a better idea of how their sizes compare in real life.
Comparison image of the Tamron 20-40mm F2.8 VXD and the Tamron 17-35mm F2.8-4 Di OSD 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 20-40mm F2.8 VXD weighs 365g, which means it is 95g (20%) lighter than the Tamron 17-35mm F2.8-4 Di OSD which has a weight of 460g.
Filter Threads
The Tamron 20-40mm F2.8 VXD has a filter size of 67mm whereas the Tamron 17-35mm F2.8-4 Di OSD has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Tamron 20-40mm F2.8 VXD:
And these are the 77mm filters that we recommend for the Tamron 17-35mm F2.8-4 Di OSD:
Lens Mounts
The Tamron 20-40mm F2.8 VXD has the Sony E lens mount whereas the Tamron 17-35mm F2.8-4 Di OSD has the Canon EF 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 Blackmagic URSA 12K LF , Z CAM E2-F6 II 6K and Z CAM E2-S6 II 6K for the Canon EF Mount.
Nikon F (FX) mount.
Focal Range
Tamron 20-40mm F2.8 VXD has a focal range of 20-40mm 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
30 - 60mm .
On the other hand, the Tamron 17-35mm F2.8-4 Di OSD has a focal range of 17-35mm and 2.1X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 27.2 - 56mm .
