The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 40mm F2.5 G and the Sigma 65mm F2 DG DN 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 65mm F2 DG DN is the longer of the two lenses at 75mm. The Sony FE 40mm F2.5 G with a length of 45mm, is 30mm shorter. Besides being longer, the Sigma 65mm F2 DG DN also has a larger diameter of 72mm compared to the Sony FE 40mm F2.5 G's 68mm diameter.
Below you can find a scaled side-by-side image of Sony FE 40mm F2.5 G and Sigma 65mm F2 DG DN to get a better idea of how their sizes compare in real life.
Comparison image of the Sony FE 40mm F2.5 G and the Sigma 65mm F2 DG DN 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. Sony FE 40mm F2.5 G weighs 173g, which means it is 232g (57%) lighter than the Sigma 65mm F2 DG DN which has a weight of 405g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Sony E Mount for size comparison purposes.
Standard Sony E Mount
Filter Threads
The Sony FE 40mm F2.5 G has a filter size of 49mm whereas the Sigma 65mm F2 DG DN has a 62mm 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 Sony FE 40mm F2.5 G:
And these are the 62mm filters that we recommend for the Sigma 65mm F2 DG DN:
Lens Mounts
Both the Sony FE 40mm F2.5 G and the Sigma 65mm F2 DG DN 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 .
Leica L mount.
Focal Range
Sony FE 40mm F2.5 G is a prime lens with fixed focal lenght of 40mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
60mm .
On the other hand, the Sigma 65mm F2 DG DN is a prime lens with fixed focal lenght of 65mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 97.5mm .
