Originally posted by lsquare Does the K7 perform any better with these two lenses or it's about the same as on the K20D? I haven't notice much reports on the performance of the K7 with these two lenses and I'm trying to evaluate on whether I would get the K7 over the K20D if there's no noticeable performance improvement.
Hey lsquare. I don't own the DA*50-135 and have never tried using one, but I've tried the DA* 16-50 on both the K20D and the K-7, so here's what I've noticed:
With Screw driven AF (non SDM) lenses: K-7 AF speed is much faster, and hunts much less in low light conditions (even without the AF assist light on)
With SDM lenses: I'm not sure if the DA*16-50 focuses that much faster on the K-7. I would say it probably is a little better just because the K-7 is just much more responsive in general. Where I've noticed the biggest improvement is in low light conditions, where the lens doesn't hunt as much. On the whole I think it responds very quickly on the K-7.
Another nice thing about the SDM and K-7 combo is that if you turn the autofocus confirm beep off the K-7 with a DA* lens on it is really silent. Compared to the K20D it's like you're in stealth mode, haha.
So I guess my advice on you getting the K20D over the K-7 would depend on how much you're going to try to use these lenses in challenging light conditions because this is one area where the K-7 really shines over the previous Pentax cameras.
Last edited by Urkeldaedalus; 07-14-2009 at 01:58 PM.