The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20-200mm F3.5-6.3 and the Tamron 18-300mm F3.5-6.3 Di 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 18-300mm F3.5-6.3 Di is the longer of the two lenses at 126mm. The Sigma 20-200mm F3.5-6.3 with a length of 118mm, is 8mm shorter. On the other hand, the Sigma 20-200mm F3.5-6.3 has a larger diameter of 77mm compared to the Tamron 18-300mm F3.5-6.3 Di's 76mm diameter.
Below you can find a scaled side-by-side image of Sigma 20-200mm F3.5-6.3 and Tamron 18-300mm F3.5-6.3 Di to get a better idea of how their sizes compare in real life.
Comparison image of the Sigma 20-200mm F3.5-6.3 and the Tamron 18-300mm F3.5-6.3 Di 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. Sigma 20-200mm F3.5-6.3 weighs 540g, which means it is 80g (12%) lighter than the Tamron 18-300mm F3.5-6.3 Di which has a weight of 620g.
Filter Threads
The Sigma 20-200mm F3.5-6.3 has a filter size of 72mm whereas the Tamron 18-300mm F3.5-6.3 Di 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 72mm filters that we recommend you to consider for the Sigma 20-200mm F3.5-6.3:
And these are the 67mm filters that we recommend for the Tamron 18-300mm F3.5-6.3 Di:
Lens Mounts
Both the Sigma 20-200mm F3.5-6.3 and the Tamron 18-300mm F3.5-6.3 Di has the same Sony E lens mount . Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX5 , Sony A7R VI and Sony A7 V .
Fujifilm X mount.
Focal Range
Sigma 20-200mm F3.5-6.3 has a focal range of 20-200mm and
10.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
30 - 300mm .
On the other hand, the Tamron 18-300mm F3.5-6.3 Di has a focal range of 18-300mm and 16.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-450mm when used on a APS-C / DX format camera.
