Disabling TC AF

**dadipentak** · 07-28-2012, 05:38 PM

AF TCs have their place but in some situations I'd prefer to use catch-in-focus. Is there some (preferably simple) way to disable the TCs AF (but retain auto-aperture functionality?)

joe.penn · 07-28-2012, 06:11 PM

What TC is it Dave? I am guessing it is using screw drive AF? I have tried on 2 different TC's [using screw drive] to no avail.

Moo · 07-29-2012, 05:29 AM

I haven't tried it, but I think covering the 7th contact with tape should disable autofocus and basically make it act like a more normal TC.
I also seem to remember reading that you can use CIF by holding the lens release button (which retracts the AF drive shaft), but I don't remember what camera was being discussed at that time, and you'd still have the AF noise, and having to hold the button in could get annoying.
Another way would be to disable the autofocus-when-half-pressing-shutter-button. You'd then use the AF button on the K-5 to activate AF. This is great if you use a mixture of manual and auto focus too.

**dadipentak** · 07-29-2012, 05:50 AM

Thanks for the replies, guys. It's a (screw-drive) Kenko 1.4x, Joe. I'll experiment with your suggestions, Moo.

07-28-2012, 05:38 PM	#1
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Disabling TC AF AF TCs have their place but in some situations I'd prefer to use catch-in-focus. Is there some (preferably simple) way to disable the TCs AF (but retain auto-aperture functionality?)

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07-28-2012, 06:11 PM	#2
joe.penn Veteran Member Join Date: Mar 2011 Location: Maryland (Right Outside Washington DC) Photos: Gallery \| Albums Posts: 2,902	What TC is it Dave? I am guessing it is using screw drive AF? I have tried on 2 different TC's [using screw drive] to no avail.

07-29-2012, 05:29 AM	#3
Moo Senior Member Join Date: Jun 2008 Posts: 173	I haven't tried it, but I think covering the 7th contact with tape should disable autofocus and basically make it act like a more normal TC. I also seem to remember reading that you can use CIF by holding the lens release button (which retracts the AF drive shaft), but I don't remember what camera was being discussed at that time, and you'd still have the AF noise, and having to hold the button in could get annoying. Another way would be to disable the autofocus-when-half-pressing-shutter-button. You'd then use the AF button on the K-5 to activate AF. This is great if you use a mixture of manual and auto focus too.

07-29-2012, 05:50 AM	#4
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590 Original Poster	Thanks for the replies, guys. It's a (screw-drive) Kenko 1.4x, Joe. I'll experiment with your suggestions, Moo.