The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 75mm f1.8 and the Sigma 60mm F2.8 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. Olympus ED 75mm f1.8 is the longer of the two lenses at 69mm. The Sigma 60mm F2.8 DN with a length of 56mm, is 13mm shorter. Besides being longer, the Olympus ED 75mm f1.8 also has a larger diameter of 64mm compared to the Sigma 60mm F2.8 DN's 61mm 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 60mm F2.8 DN weighs 190g, 37% (115g) lighter than the Olympus ED 75mm f1.8's weight of 305g.
Below you can find the dimension and weight table of the Telephoto Prime Lenses in Micro Four Thirds Mount for size comparison purposes.
Telephoto Lenses in Micro Four Thirds Mount for Size Comparison
Filter Threads
The Olympus ED 75mm f1.8 has a filter size of 58mm whereas the Sigma 60mm F2.8 DN 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 58mm filters that we recommend you to consider for the Olympus ED 75mm f1.8:
And these are the 46mm filters that we recommend for the Sigma 60mm F2.8 DN:
Lens Mounts
Both the Olympus ED 75mm f1.8 and the Sigma 60mm F2.8 DN has the same Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with the Micro Four Thirds lenses are OM System OM-1 II, Panasonic G9 II and OM System OM-5.
Sigma 60mm F2.8 DN is also available in Sony E mount.
Focal Range
Olympus ED 75mm f1.8 is a prime lens with fixed focal lenght of 75mm which has an effective (full-frame 35mm equivalent) focal range of
150mm when used on a FourThirds format camera.
On the other hand, the Sigma 60mm F2.8 DN is a prime lens with fixed focal lenght of 60mm which has an effective (full-frame 35mm equivalent) focal range of 90mm when used on a APS-C / DX format camera.