The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 135mm F1.4 and the Tamron 18-300mm F3.5-6.3 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 135mm F1.4 is the longer of the two lenses at 138mm. The Tamron 18-300mm F3.5-6.3 with a length of 126mm, is 12mm shorter. Besides being longer, the Sigma 135mm F1.4 also has a larger diameter of 112mm compared to the Tamron 18-300mm F3.5-6.3's 76mm diameter.
Below you can find a scaled side-by-side image of Sigma 135mm F1.4 and Tamron 18-300mm F3.5-6.3 to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 135mm F1.4 and the Tamron 18-300mm F3.5-6.3 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 18-300mm F3.5-6.3 weighs 620g, 56% (800g) lighter than the Sigma 135mm F1.4's weight of 1420g.
Filter Threads
The Sigma 135mm F1.4 has a filter size of 105mm whereas the Tamron 18-300mm F3.5-6.3 has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 135mm F1.4:
And these are the 67mm filters that we recommend for the Tamron 18-300mm F3.5-6.3:
Lens Mounts
The Sigma 135mm F1.4 has the Sony E lens mount whereas the Tamron 18-300mm F3.5-6.3 has the Canon RF 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 Canon R50 V , Canon R100 and Canon R50 for the Canon RF Mount.
Nikon Z mount.
Focal Range
Sigma 135mm F1.4 is a prime lens with fixed focal lenght of 135mm.
On the other hand, the Tamron 18-300mm F3.5-6.3 has a focal range of 18-300mm and 16.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 28.8-480mm when used on a APS-C / DX format camera.
