The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Olympus 150-400mm F4.5 TC and the Sigma 800mm F5.6 EX DG 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. Sigma 800mm F5.6 EX DG HSM is the longer of the two lenses at 521mm. The Olympus 150-400mm F4.5 TC with a length of 314mm, is 207mm shorter. Besides being longer, the Sigma 800mm F5.6 EX DG HSM also has a larger diameter of 157mm compared to the Olympus 150-400mm F4.5 TC's 116mm 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 150-400mm F4.5 TC weighs 1850g, which means it is 3050g (62%) lighter than the Sigma 800mm F5.6 EX DG HSM which has a weight of 4900g.
Filter Threads
The Olympus 150-400mm F4.5 TC has a filter size of 95mm whereas the Sigma 800mm F5.6 EX DG HSM 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 95mm filters that we recommend you to consider for the Olympus 150-400mm F4.5 TC:
And these are the 46mm filters that we recommend for the Sigma 800mm F5.6 EX DG HSM:
Lens Mounts
The Olympus 150-400mm F4.5 TC has the Micro Four Thirds lens mount whereas the Sigma 800mm F5.6 EX DG HSM has the Nikon F (FX) 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 Nikon D6, Nikon D780 and Nikon D3500 for the Nikon F (FX) Mount.
Sigma 800mm F5.6 EX DG HSM is also available in Canon EF and Sigma SA mounts.
Focal Range
Olympus 150-400mm F4.5 TC has a focal range of 150-400mm and
2.7X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
300-800mm when used on a FourThirds format camera.
On the other hand, the Sigma 800mm F5.6 EX DG HSM is a prime lens with fixed focal lenght of 800mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 1200mm.
