The type of photography that you are planning to use is an important decision factor. Here we have evaluated the HD Pentax-FA 77mm F1.8 Ltd and the Venus 105mm F2 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 HD Pentax-FA 77mm F1.8 Ltd with a length of 48mm, is 51mm shorter. Besides being longer, the Venus 105mm F2 also has a larger diameter of 76mm compared to the HD Pentax-FA 77mm F1.8 Ltd's 64mm diameter.
Below you can find a scaled side-by-side image of HD Pentax-FA 77mm F1.8 Ltd and Venus 105mm F2 to get a better idea of how their sizes compare in real life.
Comparison image of the HD Pentax-FA 77mm F1.8 Ltd and the Venus 105mm F2 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. HD Pentax-FA 77mm F1.8 Ltd weighs 270g, which means it is 475g (63%) lighter than the Venus 105mm F2 which has a weight of 745g.
Filter Threads
The HD Pentax-FA 77mm F1.8 Ltd has a filter size of 49mm whereas the Venus 105mm F2 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 49mm filters that we recommend you to consider for the HD Pentax-FA 77mm F1.8 Ltd:
And these are the 67mm filters that we recommend for the Venus 105mm F2:
Lens Mounts
The HD Pentax-FA 77mm F1.8 Ltd has the Pentax KAF lens mount whereas the Venus 105mm F2 has the Pentax KAF2 lens mount . Some of the latest released cameras that are compatible with these mounts are Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF Mount and Pentax K-3 III Mono , Pentax KF and Pentax K-3 III for the Pentax KAF2 Mount.
Sony E , Canon EF , Nikon F (FX) and Sony Alpha mounts.
Focal Range
HD Pentax-FA 77mm F1.8 Ltd is a prime lens with fixed focal lenght of 77mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
115.5mm .
On the other hand, the Venus 105mm F2 is a prime lens with fixed focal lenght of 105mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 157.5mm .
