09-03-2011, 03:53 PM
I've got the glass acquisition itch again... this is triggered in part as I just sent away my 450D to get it converted to full spectrum (UV to IR, although rumour has it Canon sensors don't do UV). One main application will be astrophotography, and to help in that I'm debating getting a fast prime, in the ball park of 135-200mm. In this context, fast means faster than f/2.8. 135mm is really on my lower limit so going shorter is not an option.
Sticking to Canon initially, there's the 135mm f/2 which is my 1st choice I think. Great sharpness reviews all round, will be used on crop so vignetting should be manageable. I've not managed to establish so far how it fares on coma. The other choice of course is the 200/2 but that's rather outside my budget!
So now to open it out, what else is out there? Not sure the Nikon equivalent of the 135/2 offers any advantage, nor is their 200/2 any more affordable. Is there anything in the medium format or other systems in this ball park I should look at?
Sticking to Canon initially, there's the 135mm f/2 which is my 1st choice I think. Great sharpness reviews all round, will be used on crop so vignetting should be manageable. I've not managed to establish so far how it fares on coma. The other choice of course is the 200/2 but that's rather outside my budget!
So now to open it out, what else is out there? Not sure the Nikon equivalent of the 135/2 offers any advantage, nor is their 200/2 any more affordable. Is there anything in the medium format or other systems in this ball park I should look at?
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.