Pentax-M f1.4 50mm on a K20D focusing problems

CraneGuy1 · 08-21-2009, 02:35 PM

Yea, I made the adjustment under Custom Settings #35. I had to set it to -8 to get the f1.4 even close.

On my AF lenses, I set them to -2 and things seem a bit clearer. I still have to play around with the settings some more.

Thanks again to everyone for your help with this one.

**Lowell Goudge** · 08-21-2009, 02:48 PM

just as an observation, this sounds a little too far out for a normal situation.

Have you thought about sending it to pentax to set up correctly? It is under warranty right?

CraneGuy1 · 08-21-2009, 03:00 PM

Originally posted by Lowell Goudge

So what you are saying is that both the focusing screen and the AF sensors are not correctly alligned to the image sensor, but that the focusing screen agrees with the AF sensor.

To me, this would cause every lens to be focusing incorrectly on the body.

I'm thinking that, becase of the very narrow DOF on the f1.4, it brought to light a focusing problem that I need to take care of now. The bad thing is, if I can't correct it myself, my trip to the Grand Canyon in 5 weeks may be affected.

CraneGuy1 · 08-21-2009, 03:49 PM

Originally posted by Lowell Goudge

just as an observation, this sounds a little too far out for a normal situation.

Have you thought about sending it to pentax to set up correctly? It is under warranty right?

As soon as I get back from the Grand Canyon, I'll check out the pictures and probably send it back to get adjusted.

**Lowell Goudge** · 08-21-2009, 04:35 PM

Originally posted by CraneGuy1

As soon as I get back from the Grand Canyon, I'll check out the pictures and probably send it back to get adjusted.

I don't know how pentax service is set up in the US, and how close you live to a pentax service center, but it took less than 2 weeks for me to get my K10 shutter replaced by pentax canada (although I live 10 miles from the service center, so I could take it in and pick it up.

**firefly** · 08-21-2009, 04:45 PM

I would agree with Lowell, my k20 only required a -3 to correct, and it had actually improved my zooms as well. Your k20 is actually quite a bit further out than I would accept... so enjoy your trip with your now *improved* focus and worry about the rest when you get back!

Have a good one

Mechan1k · 08-29-2009, 04:07 PM

And most importantly ... post your pics from the trip as well as we can all enjoy the new found focusing

CraneGuy1 · 08-30-2009, 05:27 AM

Yea, I'm taking four 4GB cards with me, plus my laptop, so I will be taking plenty of pictures. We're going to hit the Grand Canyon and try to get over to Bryce Canyon, Monument National Park. We're also spending several days in the Sedona area. It should be interesting.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Focusing problems with a Pentax-M 40mm f/2.8!!!	AndersPS	Pentax SLR Lens Discussion	6	04-25-2010 10:02 PM
For Sale - Sold: Pentax Brand Focusing Screens and Katz Eye Focusing Screen K10D/K20D (Worldwid	superbass	Sold Items	8	03-26-2010 01:42 PM
HELP! I'm having problems focusing with K20D	Falld5	Troubleshooting and Beginner Help	11	05-18-2009 10:58 AM
Sigma 18-50mm F2.8 EX DC MACRO AF problems on K20D	akptc	Pentax SLR Lens Discussion	3	09-04-2008 05:44 PM
50mm 2.8 Macro Focusing problems	N.Stocks	Pentax SLR Lens Discussion	3	05-04-2008 11:36 AM

08-21-2009, 02:35 PM	#16
CraneGuy1 Senior Member Join Date: Dec 2008 Photos: Gallery Posts: 102 Original Poster	Yea, I made the adjustment under Custom Settings #35. I had to set it to -8 to get the f1.4 even close. On my AF lenses, I set them to -2 and things seem a bit clearer. I still have to play around with the settings some more. Thanks again to everyone for your help with this one.

08-21-2009, 02:48 PM	#17
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	just as an observation, this sounds a little too far out for a normal situation. Have you thought about sending it to pentax to set up correctly? It is under warranty right?

08-21-2009, 03:00 PM	#18
CraneGuy1 Senior Member Join Date: Dec 2008 Photos: Gallery Posts: 102 Original Poster	Originally posted by Lowell Goudge So what you are saying is that both the focusing screen and the AF sensors are not correctly alligned to the image sensor, but that the focusing screen agrees with the AF sensor. To me, this would cause every lens to be focusing incorrectly on the body. I'm thinking that, becase of the very narrow DOF on the f1.4, it brought to light a focusing problem that I need to take care of now. The bad thing is, if I can't correct it myself, my trip to the Grand Canyon in 5 weeks may be affected.

08-21-2009, 03:49 PM	#19
CraneGuy1 Senior Member Join Date: Dec 2008 Photos: Gallery Posts: 102 Original Poster	Originally posted by Lowell Goudge just as an observation, this sounds a little too far out for a normal situation. Have you thought about sending it to pentax to set up correctly? It is under warranty right? As soon as I get back from the Grand Canyon, I'll check out the pictures and probably send it back to get adjusted.

08-21-2009, 04:35 PM	#20
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	Originally posted by CraneGuy1 As soon as I get back from the Grand Canyon, I'll check out the pictures and probably send it back to get adjusted. I don't know how pentax service is set up in the US, and how close you live to a pentax service center, but it took less than 2 weeks for me to get my K10 shutter replaced by pentax canada (although I live 10 miles from the service center, so I could take it in and pick it up.

08-21-2009, 04:45 PM	#21
firefly Site Supporter Join Date: Mar 2008 Location: New Brunswick Photos: Albums Posts: 200	I would agree with Lowell, my k20 only required a -3 to correct, and it had actually improved my zooms as well. Your k20 is actually quite a bit further out than I would accept... so enjoy your trip with your now improved focus and worry about the rest when you get back! Have a good one

08-29-2009, 04:07 PM	#22
Mechan1k Veteran Member Join Date: Jun 2007 Location: Sydney, Australia Posts: 2,891	And most importantly ... post your pics from the trip as well as we can all enjoy the new found focusing

08-30-2009, 05:27 AM	#23
CraneGuy1 Senior Member Join Date: Dec 2008 Photos: Gallery Posts: 102 Original Poster	Yea, I'm taking four 4GB cards with me, plus my laptop, so I will be taking plenty of pictures. We're going to hit the Grand Canyon and try to get over to Bryce Canyon, Monument National Park. We're also spending several days in the Sedona area. It should be interesting.

Thread Tools	Search this Thread
	Search this Thread: Advanced Search