The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon RF 100-500mm and the Olympus 300mm F4 IS Pro 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 300mm F4 IS Pro is the longer of the two lenses at 227mm. The Canon RF 100-500mm with a length of 208mm, is 19mm shorter. On the other hand, the Canon RF 100-500mm has a larger diameter of 94mm compared to the Olympus 300mm F4 IS Pro's 93mm 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 300mm F4 IS Pro weighs 1270g, 6% (95g) lighter than the Canon RF 100-500mm's weight of 1365g.
Filter Threads
Both the Canon RF 100-500mm and the Olympus 300mm F4 IS Pro have the same Filter thread size of 77mm.
Below are links to the 77mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Canon RF 100-500mm has the Canon RF lens mount whereas the Olympus 300mm F4 IS Pro has the Micro Four Thirds lens mount. Some of the latest released cameras that are compatible with these mounts are Canon R6 V, Canon R6 III and Canon C50 for the Canon RF Mount and OM System OM-3 Astro, OM System OM-5 II and OM System OM-3 for the Micro Four Thirds Mount.
Focal Range
Canon RF 100-500mm has a focal range of 100-500mm and
5.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
160 - 800mm.
On the other hand, the Olympus 300mm F4 IS Pro is a prime lens with fixed focal lenght of 300mm which has an effective (full-frame 35mm equivalent) focal range of 600mm when used on a FourThirds format camera.
