The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Panasonic 18-40mm F4.5-6.3 and the Sigma 45mm F2.8 DG DN C 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 45mm F2.8 DG DN C is the longer of the two lenses at 46mm. The Panasonic 18-40mm F4.5-6.3 with a length of 41mm, is 5mm shorter. On the other hand, the Panasonic 18-40mm F4.5-6.3 has a larger diameter of 68mm compared to the Sigma 45mm F2.8 DG DN C's 64mm 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. Panasonic 18-40mm F4.5-6.3 weighs 155g, which means it is 60g (27%) lighter than the Sigma 45mm F2.8 DG DN C which has a weight of 215g.
Filter Threads
The Panasonic 18-40mm F4.5-6.3 has a filter size of 62mm whereas the Sigma 45mm F2.8 DG DN C has a 55mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Panasonic 18-40mm F4.5-6.3:
And these are the 55mm filters that we recommend for the Sigma 45mm F2.8 DG DN C:
Lens Mounts
The Panasonic 18-40mm F4.5-6.3 has the Leica L lens mount whereas the Sigma 45mm F2.8 DG DN C has the Sony E lens mount. Some of the latest released cameras that are compatible with these mounts are Leica SL3-P, Panasonic S1 II and Panasonic S1 IIE for the Leica L Mount and Sony FX5, Sony A7R VI and Sony A7 V for the Sony E Mount.
Sigma 45mm F2.8 DG DN C is also available in Leica L mount.
Focal Range
Panasonic 18-40mm F4.5-6.3 has a focal range of 18-40mm and
2.2X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
27 - 60mm.
On the other hand, the Sigma 45mm F2.8 DG DN C is a prime lens with fixed focal lenght of 45mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 67.5mm.
