The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24mm F1.8 EX DG and the Olympus 25mm f2.8 Pancake 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 24mm F1.8 EX DG is the longer of the two lenses at 83mm. The Olympus 25mm f2.8 Pancake with a length of 24mm, is 59mm shorter. Besides being longer, the Sigma 24mm F1.8 EX DG also has a larger diameter of 84mm compared to the Olympus 25mm f2.8 Pancake'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. Olympus 25mm f2.8 Pancake weighs 95g, 80% (390g) lighter than the Sigma 24mm F1.8 EX DG's weight of 485g.
Filter Threads
The Sigma 24mm F1.8 EX DG has a filter size of 77mm whereas the Olympus 25mm f2.8 Pancake has a 43mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 77mm filters that we recommend you to consider for the Sigma 24mm F1.8 EX DG:
And these are the 43mm filters that we recommend for the Olympus 25mm f2.8 Pancake:
Lens Mounts
Both the Sigma 24mm F1.8 EX DG and the Olympus 25mm f2.8 Pancake has the same Four Thirds lens mount. Some of the latest released cameras that are compatible with the Four Thirds lenses are Olympus E-5, Olympus E-600 and Olympus E-620.
Sigma 24mm F1.8 EX DG is also available in the Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha, Sigma SA, Canon EF, Pentax KAF, Sony Alpha, Sigma SA and Nikon F (FX) mounts.
Focal Range
Sigma 24mm F1.8 EX DG is a prime lens with fixed focal lenght of 24mm.
On the other hand, the Olympus 25mm f2.8 Pancake is a prime lens with fixed focal lenght of 25mm which has an effective (full-frame 35mm equivalent) focal range of 50mm when used on a FourThirds format camera.
