Your guide to Canon camera and lens reviews

Canon EF 300mm f/2.8 L IS USM

Canon EF 300mm f/2.8 L IS USM Specifications
Frame Coverage 35mm
Lens Construction (groups) 13
Lens Construction (elements) 17
No. of Diaphragm Blades 8
Minimum Aperture 32
Closest Focusing Distance 2.5m (98.4")
Maximum Magnifcation .13x
Filter Diameter 52mm (rear gelatin filter)
Maximum Diameter x Length 128mm x 252mm (5" x 9.9")
Weight 1190g (89.9oz)
In my opinion, these lenses are not usable for high-quality long-exposure deep-sky astrophotography when used wide open unless the photographer is willing to clip a significant amount of highlight detail in the stars.
My own more pragmatic tests show that this lens is usable wide-open without any hesitation. Stopping down only increases resolution and micro contrast very slightly. When you pay for f/2.8 with this lens, you get an f/2.8 that is every bit as usable as any other aperture. That's what one is paying for.
The Canon EF 300mm f/4 L IS USM Lens differs from the Canon EF 300mm f/2.8 L IS USM Lens in title by only one f-stop, but there are more differences. The f/2.8 is sharper at f/2.8 than the f/4 is at f/4 and remains sharper at all comparable apertures. The f/2.8 costs significantly more and is significantly larger/heavier than the f/4.
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