The type of photography that you are planning to use is an important decision factor. Here we have evaluated the SG-image 25mm F1.8 and the Nikon Z 50mm F1.4 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. Nikon Z 50mm F1.4 is the longer of the two lenses at 87mm. The SG-image 25mm F1.8 with a length of 32mm, is 55mm shorter. Besides being longer, the Nikon Z 50mm F1.4 also has a larger diameter of 75mm compared to the SG-image 25mm F1.8's 67mm 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. SG-image 25mm F1.8 weighs 145g, which means it is 275g (65%) lighter than the Nikon Z 50mm F1.4 which has a weight of 420g.
Below you can find the dimension and weight table of the Standard Prime Lenses in Nikon Z Mount for size comparison purposes.
Standard Lenses in Nikon Z Mount for Size Comparison
Filter Threads
The SG-image 25mm F1.8 has a filter size of 52mm whereas the Nikon Z 50mm F1.4 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 52mm filters that we recommend you to consider for the SG-image 25mm F1.8:
And these are the 62mm filters that we recommend for the Nikon Z 50mm F1.4:
Lens Mounts
Both the SG-image 25mm F1.8 and the Nikon Z 50mm F1.4 has the same Nikon Z lens mount. Some of the latest released cameras that are compatible with the Nikon Z lenses are RED Komodo-X 6K Z, Nikon Z50 II and Nikon Z30.
SG-image 25mm F1.8 is also available in the Sony E and Fujifilm X mounts.
Focal Range
SG-image 25mm F1.8 is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of
37.5mm when used on a APS-C / DX format camera.
On the other hand, the Nikon Z 50mm F1.4 is a prime lens with fixed focal lenght of 50mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 75mm.
