Upload & Sell: On
| p.1 #13 · Any really nice 50mm f/1.2-f/1.4 primes? |
The Sigma focus issues are waaaaay overhyped - I've never had an issue with the four Sigma lenses I've owned (currently own two). The only thing I've had a focus issue with is Nikon gear (D800)! Here's my post from the other 50 prime thread:
I have owned all the Nikon AF 50 1.4s (and some 1.8s for that matter), and I definitely prefer the Sigma - it's the only one I would consider to be 'pro' quality. Not that you can't shoot 'pro' quality images with a $100 50 1.8, but the Sigma is the only one I would put in the same league as my 2.8 zooms and 1.4 primes. I'm selling my Sigma 50, but only because I have the 24G, 35G, and Sigma 85 1.4, and never use it any more.
Sigma has a few gems in their lineup (particularly the 50, 85, and 150), where one can get Nikon - or better - quality.
There are two AF issues at play, and I am not sure which one form is taking about.
1) focus distance based error. As the focus plane moves, the required MA changes, sometimes significantly. I saw this in over 3 out of 4 of the canon samples that I tried and the one that did not show it had been sent to sigma 2x. This seems less common on nikon, could relate to a different af algorithm or lens communication on nikons. If this was his issue, it might be worth another try
2) Af speed vs precision. the sig50 and sig85 have HUGE af steps. Try adjusting the MA on these lenses compared to a nikon lens. Each adjustment is HUGE and there are times when you are doing AF tracking that the lens may jackhammer slightly in too large of steps. With a perfectly adjusted lens/body, and knowledge of the lens, this is a far less troublesome issue.