The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang 100mm F2.8 Macro and the Sigma 18-35mm F1.8 DC 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. Samyang 100mm F2.8 Macro is the longer of the two lenses at 123mm. The Sigma 18-35mm F1.8 DC HSM with a length of 121mm, is 2mm shorter. On the other hand, the Sigma 18-35mm F1.8 DC HSM has a larger diameter of 78mm compared to the Samyang 100mm F2.8 Macro's 73mm diameter.
Below you can find a scaled side-by-side image of Samyang 100mm F2.8 Macro and Sigma 18-35mm F1.8 DC HSM to get a better idea of how their sizes compare in real life.
Comparison image of the Samyang 100mm F2.8 Macro and the Sigma 18-35mm F1.8 DC HSM 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. Samyang 100mm F2.8 Macro weighs 720g, which means it is 90g (11%) lighter than the Sigma 18-35mm F1.8 DC HSM which has a weight of 810g.
Filter Threads
The Samyang 100mm F2.8 Macro has a filter size of 67mm whereas the Sigma 18-35mm F1.8 DC HSM has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Samyang 100mm F2.8 Macro:
And these are the 72mm filters that we recommend for the Sigma 18-35mm F1.8 DC HSM:
Lens Mounts
The Samyang 100mm F2.8 Macro has the Pentax KAF lens mount whereas the Sigma 18-35mm F1.8 DC HSM has the Sigma SA 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 Sigma SD1 Merrill , Sigma SD1 and
Canon EF , Fujifilm X , Micro Four Thirds , Nikon F (FX) , Samsung NX , Sony Alpha and Sony E mounts.
Canon EF , Pentax KAF , Sony Alpha and Nikon F (DX) mounts.
Focal Range
Samyang 100mm F2.8 Macro is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
150mm .
On the other hand, the Sigma 18-35mm F1.8 DC HSM has a focal range of 18-35mm and 1.9X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of 27-52.5mm when used on a APS-C / DX format camera.
