Lenses with Quickshift

jaieger · 07-19-2010, 08:23 PM

Just wondering, if my lens has quickshift, is it okay to manually focus (in an AF mode) before I press the AF, and then do auto? Or is it only after it has locked on that it's okay to go manually do it?

SpecialK · 07-19-2010, 08:29 PM

I think it would defeat the purpose to have the lens AF after you focus manually.

jaieger · 07-19-2010, 08:37 PM

yeah, but on my 100mm, the AF hunts alot, but i don't want to constantly change it back and forth from manual to auto, and if I only manually focus afterwards, that means I have to wait for it to find something to lock onto. In field applicatoins, I'd probably just give it a nudge towards the subject and let AF do the rest, is what I had in mind

aerodave · 07-19-2010, 08:59 PM

Absolutely. I do that all the time with near-macro shots. It helps save a lot of unnecessary AF hunting when you get it close using quickshift first. Sometimes you have to, as the camera (my K-7 at any rate), will just refuse to even try to focus if it's too far off and looking at insufficient large-scale contrast.

jaieger · 07-19-2010, 09:01 PM

oh, sweet, awesome! so it won't damage the gear/motor or anything?

aerodave · 07-20-2010, 05:05 AM

No it won't. You can turn the focusing ring on a quick shift-enabled lens any time the AF motor isn't trying to drive it. If the motor is inactive (before the half-shutter press or after it settles into an autofocused position) you can turn the focusing ring all you want. If the motor isn't working, the lens is in "neutral".

07-19-2010, 08:23 PM	#1
jaieger Veteran Member Join Date: Jul 2010 Photos: Gallery \| Albums Posts: 586	Lenses with Quickshift Just wondering, if my lens has quickshift, is it okay to manually focus (in an AF mode) before I press the AF, and then do auto? Or is it only after it has locked on that it's okay to go manually do it?

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07-19-2010, 08:29 PM	#2
SpecialK Pentaxian Join Date: Dec 2006 Location: So California Photos: Gallery Posts: 16,358	I think it would defeat the purpose to have the lens AF after you focus manually.

07-19-2010, 08:37 PM	#3
jaieger Veteran Member Join Date: Jul 2010 Photos: Gallery \| Albums Posts: 586 Original Poster	yeah, but on my 100mm, the AF hunts alot, but i don't want to constantly change it back and forth from manual to auto, and if I only manually focus afterwards, that means I have to wait for it to find something to lock onto. In field applicatoins, I'd probably just give it a nudge towards the subject and let AF do the rest, is what I had in mind

07-19-2010, 08:59 PM	#4
aerodave Veteran Member Join Date: Aug 2007 Location: Dayton, OH Posts: 365	Absolutely. I do that all the time with near-macro shots. It helps save a lot of unnecessary AF hunting when you get it close using quickshift first. Sometimes you have to, as the camera (my K-7 at any rate), will just refuse to even try to focus if it's too far off and looking at insufficient large-scale contrast.

07-19-2010, 09:01 PM	#5
jaieger Veteran Member Join Date: Jul 2010 Photos: Gallery \| Albums Posts: 586 Original Poster	oh, sweet, awesome! so it won't damage the gear/motor or anything?

07-20-2010, 05:05 AM	#6
aerodave Veteran Member Join Date: Aug 2007 Location: Dayton, OH Posts: 365	No it won't. You can turn the focusing ring on a quick shift-enabled lens any time the AF motor isn't trying to drive it. If the motor is inactive (before the half-shutter press or after it settles into an autofocused position) you can turn the focusing ring all you want. If the motor isn't working, the lens is in "neutral".

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