The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 17-40mm f1.8 and the Sony E 18-135mm F3.5-5.6 OSS 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. Sigma 17-40mm f1.8 is the longer of the two lenses at 116mm. The Sony E 18-135mm F3.5-5.6 OSS with a length of 88mm, is 28mm shorter. Besides being longer, the Sigma 17-40mm f1.8 also has a larger diameter of 73mm compared to the Sony E 18-135mm F3.5-5.6 OSS's 67mm diameter.
Below you can find a scaled side-by-side image of Sigma 17-40mm f1.8 and Sony E 18-135mm F3.5-5.6 OSS to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 17-40mm f1.8 and the Sony E 18-135mm F3.5-5.6 OSS 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. Sony E 18-135mm F3.5-5.6 OSS weighs 325g, 39% (210g) lighter than the Sigma 17-40mm f1.8's weight of 535g.
Filter Threads
The Sigma 17-40mm f1.8 has a filter size of 67mm whereas the Sony E 18-135mm F3.5-5.6 OSS has a 55mm 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 Sigma 17-40mm f1.8:
And these are the 55mm filters that we recommend for the Sony E 18-135mm F3.5-5.6 OSS:
Lens Mounts
Both the Sigma 17-40mm f1.8 and the Sony E 18-135mm F3.5-5.6 OSS has the same Sony E lens mount . Some of the latest released cameras that are compatible with the Sony E lenses are Sony ZV-E10 II , Sony A6700 and Sony FX30 .
Leica L , Fujifilm X and Canon RF mounts.
Focal Range
Sigma 17-40mm f1.8 has a focal range of 17-40mm and
2.4X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
25.5-60mm when used on a APS-C / DX format camera.
On the other hand, the Sony E 18-135mm F3.5-5.6 OSS has a focal range of 18-135mm and 7.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-202.5mm when used on a APS-C / DX format camera.
