The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF-S 7.8mm F4 STM Dual 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 Canon RF-S 7.8mm F4 STM Dual with a length of 42mm, is 46mm shorter. On the other hand, the Canon RF-S 7.8mm F4 STM Dual has a larger diameter of 69mm compared to the Sony E 18-135mm F3.5-5.6 OSS's 67mm diameter.
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. Canon RF-S 7.8mm F4 STM Dual weighs 131g, which means it is 194g (59%) lighter than the Sony E 18-135mm F3.5-5.6 OSS which has a weight of 325g.
Filter Threads
The Canon RF-S 7.8mm F4 STM Dual has a filter size of 58mm 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 58mm filters that we recommend you to consider for the Canon RF-S 7.8mm F4 STM Dual:
And these are the 55mm filters that we recommend for the Sony E 18-135mm F3.5-5.6 OSS:
Lens Mounts
The Canon RF-S 7.8mm F4 STM Dual 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
Canon RF-S 7.8mm F4 STM Dual is a prime lens with fixed focal lenght of 7.8mm which has an effective (full-frame 35mm equivalent) focal range of
12.8mm 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.
