The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Venus 105mm F2 and the Voigtlander 90mm F3.5 SL II 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. Venus 105mm F2 is the longer of the two lenses at 99mm. The Voigtlander 90mm F3.5 SL II with a length of 52mm, is 47mm shorter. Besides being longer, the Venus 105mm F2 also has a larger diameter of 76mm compared to the Voigtlander 90mm F3.5 SL II's 63mm 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. Voigtlander 90mm F3.5 SL II weighs 320g, 57% (425g) lighter than the Venus 105mm F2's weight of 745g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Canon EF Mount for size comparison purposes.
Telephoto Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Venus 105mm F2 has a filter size of 67mm whereas the Voigtlander 90mm F3.5 SL II has a 52mm 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 Venus 105mm F2:
And these are the 52mm filters that we recommend for the Voigtlander 90mm F3.5 SL II:
Lens Mounts
Both the Venus 105mm F2 and the Voigtlander 90mm F3.5 SL II has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Venus 105mm F2 is also available in Sony E , Nikon F (FX), Pentax KAF2 and Sony Alpha mounts.
Voigtlander 90mm F3.5 SL II is also available in Nikon F (FX) and Pentax KAF mounts.
Focal Range
Venus 105mm F2 is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
168mm.
On the other hand, the Voigtlander 90mm F3.5 SL II is a prime lens with fixed focal lenght of 90mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 144mm.