The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 105mm F1.4 DG HSM and the Sigma 300mm F2.8 APO EX DG HSM 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 300mm F2.8 APO EX DG HSM is the longer of the two lenses at 215mm. The Sigma 105mm F1.4 DG HSM with a length of 132mm, is 83mm shorter. Besides being longer, the Sigma 300mm F2.8 APO EX DG HSM also has a larger diameter of 119mm compared to the Sigma 105mm F1.4 DG HSM's 116mm 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. Sigma 105mm F1.4 DG HSM weighs 1645g, which means it is 755g (31%) lighter than the Sigma 300mm F2.8 APO EX DG HSM which has a weight of 2400g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Sigma SA Mount for size comparison purposes.
Telephoto Lenses in Sigma SA Mount for Size Comparison
Filter Threads
The Sigma 105mm F1.4 DG HSM has a filter size of 105mm whereas the Sigma 300mm F2.8 APO EX DG HSM has a 46mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 105mm filters that we recommend you to consider for the Sigma 105mm F1.4 DG HSM:
And these are the 46mm filters that we recommend for the Sigma 300mm F2.8 APO EX DG HSM:
Lens Mounts
Both the Sigma 105mm F1.4 DG HSM and the Sigma 300mm F2.8 APO EX DG HSM has the same Sigma SA lens mount. Some of the latest released cameras that are compatible with the Sigma SA lenses are Sigma Quattro, Sigma Quattro H and Sigma SD1 Merrill.
Sigma 105mm F1.4 DG HSM is also available in Canon EF , Nikon F (FX) and Sony E mounts.
Sigma 300mm F2.8 APO EX DG HSM is also available in Canon EF , Nikon F (FX), Pentax KAF and Sony Alpha mounts.
Focal Range
Sigma 105mm F1.4 DG HSM is a prime lens with fixed focal lenght of 105mm.
On the other hand, the Sigma 300mm F2.8 APO EX DG HSM is a prime lens with fixed focal lenght of 300mm.