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04-09-2010, 07:06 AM   #1
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AF speed of K-x + FA43?

I previously owned the K10D + FA43. While the FA43 is my favorite Pentax lens, the AF speed of this combo was often disappointing.

I now have a K-x and of course the AF speed is much improved over the K10D. But I'm wondering how the FA43 + K-x perform together in terms of AF.

Anyone have this combo?

04-09-2010, 07:10 AM   #2
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Yes, I used to have this combo, the AF speed is satisfactory, but still cannot be compared to DA40
04-09-2010, 07:53 AM   #3
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How significant would you say the difference is?

I wish I could simply try them side by side and compare. Maybe I'll see if I can find someone to borrow them from.
04-09-2010, 08:03 AM   #4
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DA Limited has a quick shift tech...Those film lens of course cannot be so fast...But you should not be worried about the AF of the combo, I can tell you they perform really well, due to the new firmware by Pentax...

04-09-2010, 08:17 AM   #5
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QuoteOriginally posted by switters Quote
How significant would you say the difference is?

I wish I could simply try them side by side and compare. Maybe I'll see if I can find someone to borrow them from.
I have both these lenses and have tried them on *ist DS and K20D. The DA focuses noticeably faster but I cannot quantify the difference.

However, the relative difference in focus does seem consistent whether on *ist DS or K20D.
04-10-2010, 08:44 PM   #6
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...and having received my K-x today, I first tried the FA43 and soon followed with the DA40. Obviously the DA40 focused must faster, just like how it did on *ist DS and K20D.
04-11-2010, 07:19 AM   #7
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I certainly don't find much fault with the 43's focusing on my K-7 (which I assume is the same speed as the K-x).

c[_]
04-11-2010, 08:09 AM   #8
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So I had a chance to borrow the FA43 this weekend. I'm pleasantly surprised by the AF speed. It seems about the same as the FA50 in most cases. The only difference is when the focal plane changes significantly, i.e by 10 feet or more. If that happens, it takes quite a while for the motor to make the change and you can actually hear it laboring.

That's probably a situation where the DA40 would shine.

In terms of IQ, I'm reminded of why I loved this lens so much. I also prefer the 65mm EFL to the 75mm EFL of the 50. So now my decision is between the FA43 and the DA40. Focus speed is very important to me. Hopefully I can find someone to borrow the DA40 from and see how the IQ compares to the FA43. If it's close, the very quick AF speed of the DA40 may be the clincher.

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