Canon 75-300mm and Canon 70-200mm test

This is just a quick an un-scientific comparison of two Canon lenses.

Both pictures is taken with the same camera, a Canon 20D, but with two different lenses. The large images is 12% of the original size, note the difference in contrast an color!

The small crops i 100% views to show the difference in resolution and contrast.

Canon 75-300mm f/4-5.6 III USM

Focal length:300mm
Shutter:1/400s
F-stop:f6.3
ISO:100

Canon 70-200mm f/2.8L IS USM

Focal length:280mm
Shutter:1/500s
F-stop:f5.6
ISO:100

This picture is taken with the 1.4 extender.

Conclusion

You get what you pay. The 75-300mm is probably OK for use with film, but is not up to the task on a DSLR.