The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 19mm F2.8 EX DN 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 19mm F2.8 EX DN is the longer of the two lenses at 46mm. The Olympus 25mm f2.8 Pancake with a length of 24mm, is 22mm shorter. On the other hand, the Olympus 25mm f2.8 Pancake has a larger diameter of 64mm compared to the Sigma 19mm F2.8 EX 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. Olympus 25mm f2.8 Pancake weighs 95g, 32% (45g) lighter than the Sigma 19mm F2.8 EX DN's weight of 140g.
Filter Threads
The Sigma 19mm F2.8 EX DN has a filter size of 46mm 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 46mm filters that we recommend you to consider for the Sigma 19mm F2.8 EX DN:
And these are the 43mm filters that we recommend for the Olympus 25mm f2.8 Pancake:
Lens Mounts
The Sigma 19mm F2.8 EX DN has the Micro Four Thirds lens mount whereas the Olympus 25mm f2.8 Pancake has the Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are , and for the Micro Four Thirds Mount and Olympus E-5, Olympus E-600 and Olympus E-620 for the Four Thirds Mount.
Sigma 19mm F2.8 EX DN is also available in the Sony E mount.
Focal Range
Sigma 19mm F2.8 EX DN is a prime lens with fixed focal lenght of 19mm which has an effective (full-frame 35mm equivalent) focal range of
28.5mm when used on a APS-C / DX format camera.
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.
