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bran new a560 back focusing with minolta 50mm1.7

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OldNoob View Drop Down
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Post Options Post Options   Quote OldNoob Quote  Post ReplyReply Direct Link To This Post Topic: bran new a560 back focusing with minolta 50mm1.7
    Posted: 10 March 2012 at 08:33
Ok so I just got my new a560,,, works fine wih the kit lens, however when I put on my trusty minolta 50mm it back focuses. I never had this probem with my a100.   Any sugestions?

50mm @ 1.7 i was focusing on the 12. tried all auto focus modes.
i do a lot of macro ,, this is just unacceptable.

Im very frustrated ,, the only reason i stayed with sony , is because of my Minolta glass and the a100 was spot on. I am thinking of retuning the a560 and selling my Minolta glass. guess Sony wants us to buy lenses

Edited by OldNoob - 10 March 2012 at 10:18
 



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JimmyMelbourne View Drop Down
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Post Options Post Options   Quote JimmyMelbourne Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 09:00
Can you try a few more lenses if possible just to ensure it is not the camera?
A300, A37, A77, Tk 11-16 2.8, S 16-50 2.8, T 17-50 2.8, S 18-250, Mn 28-105, Mn 24 2.8, MN 35-70 F4, CZ 50 1.4, MN 50 1.7, Mn 50 2.8, S 70-200 2.8 G, MN 70-210 f4, MN 75-300 BBC, SG 85 1.4
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OldNoob View Drop Down
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Post Options Post Options   Quote OldNoob Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 11:48
spot focus mode
kit lens 18mm at f3.5


kit lens at about 50mm


Minolta 50mm at 1.7

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Hobgoblin View Drop Down
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Post Options Post Options   Quote Hobgoblin Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 11:59
When I first got my A580 it had a problem that many people said was impossible.

The Contrast Detect focussing mode is only supposed to work with SAM/SSM lenses and then in live view mode. However, my camera was attempting to use CD autofocus instead of Phase detect even when it was in OVF mode with a screw drive lens attached.

Also it had a very 'hair trigger' shutter button that would often fire when I'm sure the focus wasn't on where I wanted it to be.

The result of these two issues were that many shots were out of focus or had back/front focus.

I was prepared to send it back but first did a factory reset and neither problem has returned since.

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OldNoob View Drop Down
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Post Options Post Options   Quote OldNoob Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 12:06
Thanks, I tried the factory reset but it did not help sadly saddly. The minolta lens defalts to phase and is not changeable.
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dca1213 View Drop Down
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Post Options Post Options   Quote dca1213 Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 13:07
At f1.7 you have a very narrow depth of field. What aperture did you use on the kit lens, much greater DOF in that image?

It may be your lens, it looks like it could have an element out of alignment.
Dennis
 



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OldNoob View Drop Down
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Post Options Post Options   Quote OldNoob Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 17:06
Originally posted by dca1213 dca1213 wrote:

At f1.7 you have a very narrow depth of field. What aperture did you use on the kit lens, much greater DOF in that image?

It may be your lens, it looks like it could have an element out of alignment.


The lens is spot-on and sharp as a tack when I use it with the a100 or my Minolta 650
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OldNoob View Drop Down
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Post Options Post Options   Quote OldNoob Quote  Post ReplyReply Direct Link To This Post Posted: 10 March 2012 at 18:46
UPDATE: after a small sensor position adjustment i have managed to get the back-focus issue more under control. Although its not perfect, i do not want to turn the screws to much.
here are some pics after the adjustment.



From 3/4" back-focus to 3/16" back-focus ,, not to bad.

Edited by OldNoob - 10 March 2012 at 18:51
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tqlla View Drop Down
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Post Options Post Options   Quote tqlla Quote  Post ReplyReply Direct Link To This Post Posted: 16 March 2012 at 03:19
I had it on my A550. I think its a pretty common problem.

I wanted to replace my A550 with a 580... but I dont want to go through the hassle of re-adjusting the camera again.
Sony A850 | Sony A65
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