Just had a look at this really good webpage on lenses for astrophotography:
http://www.astropix.com/HTML/I_ASTROP/LENSES.HTM
Here's an excerpt:
Quote:
The following lenses and astrophotographic performance descriptions apply to APS-sized 1.3x, 1.5x and 1.6x crop-factor sensors. In general, lens performance in the corners degrades as the sensor size gets larger.
- Canon EF 15mm f/2.8 ($580) - very good at f/4
- Canon EF 16mm-35mm f/2.8 L II USM Zoom ($1,400) - ok at f/2.8, good at f/4
- Canon EF 17mm-40mm f/4 L USM Zoom ($680) - ok at f/4, very good at f/5.6
- Canon EF 24-105mm f/4 L USM IS Zoom ($1,060) - ok at f/4, very good at f/5.6
- Canon EF 24mm f/1.4 L USM ($1,120) - good at f/2.8
- Canon EF 28mm f/1.8 USM($400) - good at f/2.8
- Canon EF 35mm f/2 ($230) - ok at f/2, good at f/2.8
- Canon EF 50mm f/1.4 USM ($310) - good at f/2.8
- Canon EF 50mm f/1.8 II Canon ($90) - good at f/2.8
- Canon EF 85mm f/1.2 L II USM ($1,790) - good at f/2.5, very good at f/2.8
- Canon EF 100mm f/2 USM ($390) - good at f/2.8, very good at f/4
- Canon EF 100mm f/2.8 USM Macro ($470) - good at f/2.8, very good at f/4
- Canon EF 135mm f/2 L USM ($900) - good at f/2.8, very good at f/4
- Canon EF 200mm f/2.8 L II USM ($660) - good at f/2.8, very good at f/4
- Canon EF 400mm f/5.6 L USM ($1,100) - good at f/5.6
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Any thoughts on this ^^^ Seems like a reasonable guide
