AF sensors off?

**Spodeworld** · 12-22-2015, 05:06 PM

Does anyone know anyone who can fix AF sensors that might be off? I have a K20D that seems to get a bit wonky in AF hunting like crazy and giving up a lot of the time. It may not be worth it unless it is relatively inexpensive given that it is an older camera.

BTW, I did ask Eric, but he doesn't do this kind of stuff.

Thanks

**UncleVanya** · 12-22-2015, 05:11 PM

Cleaning?

**Spodeworld** · 12-22-2015, 06:34 PM

Originally posted by UncleVanya

Cleaning?

You think the AF sensors might be dirty? Hmmm....never heard of such a thing, but who knows. Not sure if that is something I can do myself. Not even sure where they're located to clean them.

Eric suggested that they might be out of alignment. Not sure how to address that.

stevebrot · 12-22-2015, 06:36 PM

Originally posted by UncleVanya

Cleaning?

What he said. Dust and/or film may accumulate on the lens for the AF sensor.

Originally posted by Spodeworld

Not sure if that is something I can do myself. Not even sure where they're located to clean them.

Eric suggested that they might be out of alignment. Not sure how to address that.

The AF sensor is in the bottom of the mirror box and faces toward the rear of the camera. Cleaning and alignment would be part of a standard CLA on the camera.

Steve

**Spodeworld** · 12-23-2015, 05:10 AM

If it means anything, it often works ok for a few minutes finding focus without issue, then gets wonky. Not sure if that adds any useful info.

---------- Post added 12-23-15 at 07:11 AM ----------

Originally posted by stevebrot

What he said. Dust and/or film may accumulate on the lens for the AF sensor.

The AF sensor is in the bottom of the mirror box and faces toward the rear of the camera. Cleaning and alignment would be part of a standard CLA on the camera.

Steve

How accessible are the sensors?

**Spodeworld** · 12-23-2015, 01:17 PM

Hmmm....I put a HSM lens on it (motor in lens) and it works fine. It seems like the problem was with the screw drive driven ones so far. Anyone heard of the screw drive mechanism going wonky while still working otherwise? And, any ideas on if that can be reasonably fixed?

Thanks

12-22-2015, 05:06 PM	#1
Spodeworld Site Supporter Join Date: Aug 2011 Location: New Joisey Photos: Gallery \| Albums Posts: 1,370	AF sensors off? Does anyone know anyone who can fix AF sensors that might be off? I have a K20D that seems to get a bit wonky in AF hunting like crazy and giving up a lot of the time. It may not be worth it unless it is relatively inexpensive given that it is an older camera. BTW, I did ask Eric, but he doesn't do this kind of stuff. Thanks

12-23-2015, 01:17 PM	#6
Spodeworld Site Supporter Join Date: Aug 2011 Location: New Joisey Photos: Gallery \| Albums Posts: 1,370 Original Poster	Hmmm....I put a HSM lens on it (motor in lens) and it works fine. It seems like the problem was with the screw drive driven ones so far. Anyone heard of the screw drive mechanism going wonky while still working otherwise? And, any ideas on if that can be reasonably fixed? Thanks Last edited by Spodeworld; 12-23-2015 at 03:24 PM.

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12-22-2015, 05:11 PM	#2
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,400	Cleaning?

12-22-2015, 06:34 PM	#3
Spodeworld Site Supporter Join Date: Aug 2011 Location: New Joisey Photos: Gallery \| Albums Posts: 1,370 Original Poster	Originally posted by UncleVanya Cleaning? You think the AF sensors might be dirty? Hmmm....never heard of such a thing, but who knows. Not sure if that is something I can do myself. Not even sure where they're located to clean them. Eric suggested that they might be out of alignment. Not sure how to address that.

12-22-2015, 06:36 PM	#4
stevebrot Otis Memorial Pentaxian Join Date: Mar 2007 Location: Vancouver (USA) Photos: Gallery \| Albums Posts: 42,007	Originally posted by UncleVanya Cleaning? What he said. Dust and/or film may accumulate on the lens for the AF sensor. Originally posted by Spodeworld Not sure if that is something I can do myself. Not even sure where they're located to clean them. Eric suggested that they might be out of alignment. Not sure how to address that. The AF sensor is in the bottom of the mirror box and faces toward the rear of the camera. Cleaning and alignment would be part of a standard CLA on the camera. Steve

12-23-2015, 05:10 AM	#5
Spodeworld Site Supporter Join Date: Aug 2011 Location: New Joisey Photos: Gallery \| Albums Posts: 1,370 Original Poster	If it means anything, it often works ok for a few minutes finding focus without issue, then gets wonky. Not sure if that adds any useful info. ---------- Post added 12-23-15 at 07:11 AM ---------- Originally posted by stevebrot What he said. Dust and/or film may accumulate on the lens for the AF sensor. The AF sensor is in the bottom of the mirror box and faces toward the rear of the camera. Cleaning and alignment would be part of a standard CLA on the camera. Steve How accessible are the sensors?

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