The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Viltrox 135mm f1.8 FE and the Viltrox 75mm f1.2 AF 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. Viltrox 135mm f1.8 FE is the longer of the two lenses at 146mm. The Viltrox 75mm f1.2 AF with a length of 101mm, is 45mm shorter. Besides being longer, the Viltrox 135mm f1.8 FE also has a larger diameter of 93mm compared to the Viltrox 75mm f1.2 AF's 87mm 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. Viltrox 75mm f1.2 AF weighs 670g, 45% (565g) lighter than the Viltrox 135mm f1.8 FE's weight of 1235g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Lenses in Sony E Mount for Size Comparison
Filter Threads
The Viltrox 135mm f1.8 FE has a filter size of 82mm whereas the Viltrox 75mm f1.2 AF has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 82mm filters that we recommend you to consider for the Viltrox 135mm f1.8 FE:
And these are the 77mm filters that we recommend for the Viltrox 75mm f1.2 AF:
Lens Mounts
Both the Viltrox 135mm f1.8 FE and the Viltrox 75mm f1.2 AF 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.
Viltrox 75mm f1.2 AF is also available in Fujifilm X and Nikon Z mounts.
Focal Range
Viltrox 135mm f1.8 FE is a prime lens with fixed focal lenght of 135mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
202.5mm.
On the other hand, the Viltrox 75mm f1.2 AF is a prime lens with fixed focal lenght of 75mm which has an effective (full-frame 35mm equivalent) focal range of 112.5mm when used on a APS-C / DX format camera.
