The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 300mm f2.8L IS USM and the Canon 28-300mm f3.5-5.6L 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 300mm f2.8L IS USM is the longer of the two lenses at 252mm. The Canon 28-300mm f3.5-5.6L IS USM with a length of 184mm, is 68mm shorter. Besides being longer, the Canon 300mm f2.8L IS USM also has a larger diameter of 128mm compared to the Canon 28-300mm f3.5-5.6L IS USM's 92mm 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 28-300mm f3.5-5.6L IS USM weighs 1670g, 34% (880g) lighter than the Canon 300mm f2.8L IS USM's weight of 2550g.
Filter Threads
The Canon 300mm f2.8L IS USM has a filter size of 52mm whereas the Canon 28-300mm f3.5-5.6L IS USM has a 77mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 52mm filters that we recommend you to consider for the Canon 300mm f2.8L IS USM:
And these are the 77mm filters that we recommend for the Canon 28-300mm f3.5-5.6L IS USM:
Lens Mounts
Both the Canon 300mm f2.8L IS USM and the Canon 28-300mm f3.5-5.6L IS USM has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Focal Range
Canon 300mm f2.8L IS USM is a prime lens with fixed focal lenght of 300mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of
480mm.
On the other hand, the Canon 28-300mm f3.5-5.6L IS USM has a focal range of 28-300mm and 10.7X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 44.8 - 480mm.