The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 55-250mm f4-5.6 IS II and the Canon 75-300mm f4.0-5.6 IS USM 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. Canon 75-300mm f4.0-5.6 IS USM is the longer of the two lenses at 138mm. The Canon 55-250mm f4-5.6 IS II with a length of 108mm, is 30mm shorter. Besides being longer, the Canon 75-300mm f4.0-5.6 IS USM also has a larger diameter of 79mm compared to the Canon 55-250mm f4-5.6 IS II's 70mm 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. Canon 55-250mm f4-5.6 IS II weighs 390g, which means it is 260g (40%) lighter than the Canon 75-300mm f4.0-5.6 IS USM which has a weight of 650g.
Filter Threads
Both the Canon 55-250mm f4-5.6 IS II and the Canon 75-300mm f4.0-5.6 IS USM have the same Filter thread size of 58mm.
Below are links to the 58mm filters that we recommend you to consider for these lenses:
Lens Mounts
The Canon 55-250mm f4-5.6 IS II has the Canon EF-S lens mount whereas the Canon 75-300mm f4.0-5.6 IS USM has the Canon EF lens mount. Some of the latest released cameras that are compatible with these mounts are Canon T8i, Canon 90D and Canon SL3 for the Canon EF-S Mount and Canon 1D X III, Canon 6D MII and Canon 5D MIV for the Canon EF Mount.
Focal Range
Canon 55-250mm f4-5.6 IS II has a focal range of 55-250mm and
4.5X zoom ratio which has an effective (full-frame 35mm equivalent) focal range of
88-400mm when used on a APS-C / DX format camera.
On the other hand, the Canon 75-300mm f4.0-5.6 IS USM has a focal range of 75-300mm and 4.0X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 120 - 480mm.