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02-27-2013, 03:23 PM   #1
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pentax kr af adjustments

Hello,

Today i've received a second hand tamron 17 50 2.8, and after some playing around with it, i've settled the af fine adjustment to -7 for my camera.
When i put the kitlens back on, it stays on the -7 setting. I thought that the camera would remember the settings for each lens separate.
Does this mean that i have to change these settings every time i change my lenses? Doesn't seem very practical.

Am i wrong, or do i miss something here?

Best Regards,

Adam

02-27-2013, 03:29 PM   #2
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The K-5 remembers some lenses, not the K-r. Sorry. So yes, you will have to adjust it each time or focus manually.
02-27-2013, 04:13 PM   #3
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Na Horuk,

Thanks for the reply, to bad the kr doesn't remeber the lenses separate, a quick change of lenses becomes directly more cumberome this way.
What do you mean with "the k5 remebers some lenses"? Only pentax?

Regards,

Adam
02-27-2013, 04:38 PM   #4
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K-5 has memory slots for AF tune settings for 20 lenses. These must be lenses with chips that identify themselves individually. The k-7 does as well. The k-x and k-r both have only a single 'global' AF tune setting.

If you have the 17-50 why are you still using the kit lens? Covers essentially the same range. I would put the kit lens on the shelf and use the 17-50 adjusted properly.

02-27-2013, 04:40 PM   #5
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clear!

just put the kit lens on to check if the af adjustments would be different. I have the 50 200 also that i still want use.

thanks for taking your time.
02-27-2013, 04:48 PM - 1 Like   #6
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QuoteOriginally posted by crabe919 Quote
I have the 50 200 also that i still want use.
In your case you have to make a compromise. I'd forget the 18-55 but test the 50-200 and then average the settings from the 17-50 and 50-200 if they are close then you are good. If the 17-50 is -7 and the 50-200 is say -4 pick -5 or -6 and go with it. AF fine tuning is more critical the faster the lens, with slow lenses the depth of focus masks any errors anyway.
02-28-2013, 01:15 AM   #7
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Ok, nice tip, will test all my lenses and see if i can find a good middle ground.
Good tip on the "speed" of the lens beiing more critical for focus errors.

adam
02-28-2013, 07:17 AM   #8
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You can also find some threads on how to properly test AF and what to watch out for, including focus test charts.

02-28-2013, 07:41 AM   #9
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did find some already, have tested my lenses and came to the conclusion that -5 will do best for all use, this way i have te most benefit from the tamron, without a lot of loss on my other lenses.
02-28-2013, 09:19 AM   #10
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Btw, did you get that Tamron for free? You can sell the kit lens and the tamron and get something like the Pentax 16-45mm. And maybe you won't need focus adjustment with it. Though I'm not sure if the 16-45mm is actually better than the Tamron in IQ.
02-28-2013, 09:59 AM   #11
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did not had the luck to get it for free :-)
just wanted an upgrade to the kitlens that handled low light indoor situations better. Therefore i went with the tamron.
Normally i use my 50 1.7 in these situations, but kids are moving fast.
The 16 45 doesn't fit my bill.
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