The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Canon 28-105mm f4.0-5.6 USM and the Canon 24-70mm f2.8L II 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 24-70mm f2.8L II USM is the longer of the two lenses at 113mm. The Canon 28-105mm f4.0-5.6 USM with a length of 68mm, is 45mm shorter. Besides being longer, the Canon 24-70mm f2.8L II USM also has a larger diameter of 89mm compared to the Canon 28-105mm f4.0-5.6 USM's 67mm 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 28-105mm f4.0-5.6 USM weighs 210g, which means it is 595g (73%) lighter than the Canon 24-70mm f2.8L II USM which has a weight of 805g.
Below you can find the dimension and weight table of the Standard Zoom Lenses in Canon EF Mount for size comparison purposes.
Standard Lenses in Canon EF Mount for Size Comparison
Filter Threads
The Canon 28-105mm f4.0-5.6 USM has a filter size of 58mm whereas the Canon 24-70mm f2.8L II USM has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 58mm filters that we recommend you to consider for the Canon 28-105mm f4.0-5.6 USM:
And these are the 82mm filters that we recommend for the Canon 24-70mm f2.8L II USM:
Lens Mounts
Both the Canon 28-105mm f4.0-5.6 USM and the Canon 24-70mm f2.8L II 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 28-105mm f4.0-5.6 USM has a focal range of 28-105mm and
3.8X 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 - 168mm.
On the other hand, the Canon 24-70mm f2.8L II USM has a focal range of 24-70mm and 2.9X zoom ratio . When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 38.4 - 112mm.