The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus ED 40-150mm F2.8 Pro and the Sigma 70-300mm F4-5.6 DG 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 40-150mm F2.8 Pro is the longer of the two lenses at 160mm. The Sigma 70-300mm F4-5.6 DG with a length of 122mm, is 38mm shorter. Besides being longer, the Olympus ED 40-150mm F2.8 Pro also has a larger diameter of 79mm compared to the Sigma 70-300mm F4-5.6 DG's 77mm 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 70-300mm F4-5.6 DG weighs 550g, 27% (210g) lighter than the Olympus ED 40-150mm F2.8 Pro's weight of 760g.
Filter Threads
The Olympus ED 40-150mm F2.8 Pro has a filter size of 72mm whereas the Sigma 70-300mm F4-5.6 DG has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Olympus ED 40-150mm F2.8 Pro:
And these are the 58mm filters that we recommend for the Sigma 70-300mm F4-5.6 DG:
Lens Mounts
The Olympus ED 40-150mm F2.8 Pro has the Micro Four Thirds lens mount whereas the Sigma 70-300mm F4-5.6 DG has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Sigma 70-300mm F4-5.6 DG is also available in Canon EF , Nikon F (FX), Pentax KAF, Sony Alpha, Sigma SA, Canon EF, Nikon F (FX), Pentax KAF and Sigma SA mounts.
Focal Range
Olympus ED 40-150mm F2.8 Pro has a focal range of 40-150mm and
3.8X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
80-300mm when used on a FourThirds format camera.
On the other hand, the Sigma 70-300mm F4-5.6 DG has a focal range of 70-300mm and 4.3X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 105 - 450mm.
