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11-16-2015, 02:00 AM   #1
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Pentax AF

Hi all,


I own a Pentax K5 since 2012 and I'm very satisfied about the build quality of the body and of the image quality I get from the camera, but the AF always gave me some troubles (so, no real news here :-). Yesterday I tried a Nikon D200 (a 2005 pro body) with a Nikon 18-70 lens, and it has more or less the same "physical" characteristics of the K5 (a 2010 body), in terms of build quality, buttons, wheatear sealing, and number of AF points.


What really surprised me is that the AF was a lot faster and precise of that of the K5, without all the uncertainties I have focussing with the K5 + the DA17-70. It surprised me because the K5 is 5 years younger than the D200... I already decided to buy a K3II, so my question for the K3II owners is: is the K3II's AF so much better than that of the K5 to fill the gap with the competition or will I have the same "surprise" comparing the K3II with a 5 years older Nikon body?


Thanks,
Michele



Last edited by aiki76; 11-16-2015 at 02:17 AM.
11-16-2015, 02:46 AM   #2
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In terms of build quality Pentaxīs high-end DSLRīs are quite comparable to canikonīs professional cameras. Nikonīs D200,D300 etc are also well built, no doubt.

When it comes to AF, every DSLR-generation has been a step forward for Pentax. Top-of-the-range canikons are still ahead, and it will be interesting to see how the forthcoming K-1 performs.
However,even with the latest current models it is often the lens which is the limiting factor. The DA17-70 is not among the fastest focusing lenses, and you might want to do some testing with faster lenses.

Last edited by PePe; 11-16-2015 at 06:42 AM.
11-16-2015, 03:50 AM - 1 Like   #3
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The K3 is a long way ahead of the K5 in AF. I miss very few shots with it.
11-16-2015, 04:00 AM   #4
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QuoteOriginally posted by Paul the Sunman Quote
The K3 is a long way ahead of the K5 in AF. I miss very few shots with it.
I upgraded from K7 to K3ii a couple of weeks ago and the improvements in performance are huge. AF, burst rate, IQ, and noise at every ISO are all much improved.

11-16-2015, 06:35 AM   #5
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Years ago a French (IIRC) magazine did a comparison of the D7000, 60D, and K-5. The D7000 and 60D had faster AF, but the K-5 was more accurate.
11-16-2015, 07:13 AM   #6
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QuoteOriginally posted by aiki76 Quote
[...] I already decided to buy a K3II, so my question for the K3II owners is: is the K3II's AF so much better than that of the K5 to fill the gap with the competition or will I have the same "surprise" comparing the K3II with a 5 years older Nikon body? [...]
You might also take a look at another current thread - https://www.pentaxforums.com/forums/172-pentax-k-3/307927-k3ii-wildlife.html
11-16-2015, 09:45 AM   #7
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QuoteOriginally posted by aiki76 Quote
is the K3II's AF so much better than that of the K5 to fill the gap with the competition or will I have the same "surprise" comparing the K3II with a 5 years older Nikon body?
I suspect it's not merely the K5 that is at fault her. Many people have experienced not only slow focus with DA 17-70, but inaccurate focus as well. I tried to calibrate my DA 17-70 with the K-5iis, and found it impossible. The lens consistently misfocused, but there was no pattern to the inaccuracy which could be corrected via calibration.

The K3II would obviously focus better than the either the K-5 or the K-5iis. But the DA 17-70 would not necessarily be the best lens to determine how much better the K3II really is.
11-16-2015, 09:59 AM   #8
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You would need to compare a screw focus Nikon lens for a fair comparison. The 18-70 is an AF-S lens and AF-S lenses focus mutch faster than the older screw type.

Ronnie

11-16-2015, 11:10 AM   #9
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Hallo, thanks to everybody.


@ fwcetus, thanks, I've seen this thread


all, I agree that the 17-70 is not the best Pentax lens in terms of AF, but I compared with a 18-70, that is very well built (better than the pentax) but isn't constant aperture, so I was expecting that the Pentax wouldn't be so worst. What concerns me is the continue moving of the AF around the right focus point, before stopping at that point. Again, I know it is a common problem with the 17-70, but I didn't realised that the difference with the competition was so big, also considering that the camera I tried was presented to me as a old camera (as it is). What would be the comparison with a 2005 Pentax body? By the way, I have also many other lenses, and none of them are fast as the 18-70 Nikon I tried.


@ ronnies : The comparison should be fair, because both the Pentax and the Nikon have ultrasonic motor, I think


Giving so, I will sook skip to K3II + DA 16-85, and I would see! Fingers crossed!!!
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