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02-06-2010, 03:53 AM   #1
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Slow focusing DA*55?

I keep reading about this lens that it focuses slowly.
How slow is it?
For example FA43 is regarded as relatively slow focusing lens. So how does the DA*55 ccompare to it?

TIA
Peter

02-06-2010, 04:01 AM   #2
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The lens has a relatively long focus throw and long hunting time. So in cases it does hunt, you'd notice the hunting more than when using FA 50 f/1.4 or DA 40 f/2.8.
02-06-2010, 05:09 AM   #3
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After I got my DA55/1.4 I compared it in real life shooting to my FA50/1.4. I didn't see any appreciable difference in AF speed between the two lenses. If your metric is just infinity to close focus time, the DA is very slow, but in real life picture taking, it's as fast as any other Pentax AF lens.
02-06-2010, 08:28 AM   #4
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QuoteOriginally posted by Wheatfield Quote
After I got my DA55/1.4 I compared it in real life shooting to my FA50/1.4. I didn't see any appreciable difference in AF speed between the two lenses. If your metric is just infinity to close focus time, the DA is very slow, but in real life picture taking, it's as fast as any other Pentax AF lens.
I'm in agreement with Wheatfield here. Lock to lock it's slow... but I was walking around the mall at a quick pace last night and took a random picture of a sign while I was walking and it focused dead on within 1 second. And that's with me still moving and on AF-S.

But don't use this for sports. It's not a sport lens. It makes a great portrait lens and does it very well. Accurate focus and decent AF speed for that purpose.

02-06-2010, 09:00 AM   #5
emr
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blende8 said in his good review and comparison, that

QuoteQuote:
The big disadvantage of the DA55 is that it is much slower compared to the FA50 in AF speed. The DA55 is about 3 times slower than the FA (measured using Audacity)! I am wondering why this is so and what Pentax has to say about it. The argumentation that the AF of the DA55 is slow because it is a portrait lens does not hold. The FA85, which the DA55 should replace, is very fast.
Pentax DA55 and FA50 - a comparison

EDIT: inserted a longer quote

Last edited by emr; 02-06-2010 at 09:13 AM.
02-06-2010, 10:11 AM   #6
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it is really slow. I'm quite tentative to use it for something mobile. compared against my FA35/2 which is blazing fast and could focus within 1 sec, the DA*55 takes about approximately 2.5-3 sec to lock.
02-06-2010, 11:43 AM   #7
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QuoteOriginally posted by Pentaxor Quote
it is really slow. I'm quite tentative to use it for something mobile. compared against my FA35/2 which is blazing fast and could focus within 1 sec, the DA*55 takes about approximately 2.5-3 sec to lock.
Well, I tested mine by seeing if it would follow focus on vehicles moving towards me at 50 -60 MPH (80-100KPH). It did this as well as my FA50/1.4.
I don't think it is fair to compare it's speed to the 35/2, since you have much greater depth of field to mask focus inaccuracies.
02-06-2010, 01:10 PM   #8
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I never think of it as being "too slow" in normal use.

Compared to the 43, they were about the same on my K20, and the 77 felt slower. The K-7's screw drive is more powerful, speeding up the 43 and 77, but not the 55.

So I'd say it's a bit slower than the others now, but it's decisive.

02-06-2010, 03:35 PM   #9
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QuoteOriginally posted by farfisa Quote
I never think of it as being "too slow" in normal use.

Compared to the 43, they were about the same on my K20, and the 77 felt slower. The K-7's screw drive is more powerful, speeding up the 43 and 77, but not the 55.

So I'd say it's a bit slower than the others now, but it's decisive.
Thanks,
for now I'm sticking to K10D and I think I'll keep that one for a while to come. So I'd compare it to your K20...

Thanks

Peter
02-06-2010, 03:36 PM   #10
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btw, thanks for all the shared opinions
I really appreciate them
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