The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 23mm F1.4 C 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. Sony E 18-135mm F3.5-5.6 OSS is the longer of the two lenses at 88mm. The Sigma 23mm F1.4 C with a length of 79mm, is 9mm shorter. Besides being longer, the Sony E 18-135mm F3.5-5.6 OSS also has a larger diameter of 67mm compared to the Sigma 23mm F1.4 C's 66mm diameter.
Below you can find a scaled side-by-side image of Sigma 23mm F1.4 C 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 23mm F1.4 C 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, 1% (5g) lighter than the Sigma 23mm F1.4 C's weight of 330g.
Filter Threads
The Sigma 23mm F1.4 C has a filter size of 52mm 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 52mm filters that we recommend you to consider for the Sigma 23mm F1.4 C:
And these are the 55mm filters that we recommend for the Sony E 18-135mm F3.5-5.6 OSS:
Lens Mounts
The Sigma 23mm F1.4 C has the Canon RF lens mount whereas the Sony E 18-135mm F3.5-5.6 OSS 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 ZV-E10 II , Sony A6700 and Sony FX30 for the Sony E Mount.
Focal Range
Sigma 23mm F1.4 C is a prime lens with fixed focal lenght of 23mm which has an effective (full-frame 35mm equivalent) focal range of
36.8mm 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.
