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12-22-2012, 09:09 PM   #1
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MF assist point

on the camera, you can use a mf lens and get only the center af point to confirm focus
is it possible to set the other points to do the same thing?

12-22-2012, 09:16 PM   #2
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Not on any manual focus lens I have tried.

It might be possible on one of the newer MF lenses like the Samyangs since I assume they have electrical contacts and except for the focus act like modern lenses. I don't have one and that would be a good question if someone has one of them and can answer.

But older lenses, no.
12-22-2012, 10:32 PM   #3
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Sort of a strange question.

I guess the easiest way to answer would be to simply take the camera and see whether it is possible to do what you suggest with the lens you are interested in.

On my K10D, if the lens provides focal-length information to the camera, the AF system will support both auto AF multi-point and SEL mode. For Pentax brand, this would include DA, D FA, FA J, FA, and F series lenses. This information is in the camera manual.


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Last edited by stevebrot; 12-22-2012 at 10:57 PM.
12-22-2012, 10:47 PM   #4
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QuoteOriginally posted by photoman1 Quote
on the camera, you can use a mf lens and get only the center af point to confirm focus
is it possible to set the other points to do the same thing?
You can use any point you want to via SEL mode


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12-22-2012, 10:54 PM   #5
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QuoteOriginally posted by Adam Quote
You can use any point you want to via SEL mode
Which camera with what lenses, Adam?


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12-22-2012, 11:17 PM   #6
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QuoteOriginally posted by stevebrot Quote
Which camera with what lenses, Adam?


Steve
I just tried it on my K-5, it'll work with any lens I'm pretty sure.

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12-22-2012, 11:18 PM   #7
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Doesn't seem to work on my k-x - going into SEL mode and moving the point, then going back into SEL mode and it's still on center point.
12-22-2012, 11:40 PM   #8
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QuoteOriginally posted by Adam Quote
I just tried it on my K-5, it'll work with any lens I'm pretty sure.

Doesn't work with K5 and SMC ''K'' lenses for sure......are you using A lenses, Adam?

12-23-2012, 06:20 AM   #9
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QuoteOriginally posted by Adam Quote
You can use any point you want to via SEL mode
on my k20, i have tried moving the af point while using a manual lens and it doesn't work ;-(
12-23-2012, 08:57 AM   #10
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QuoteOriginally posted by vrrattko Quote
Doesn't work with K5 and SMC ''K'' lenses for sure......are you using A lenses, Adam?
You're right- with an M lens, all of a sudden nothing happens. Did with with auto lenses in MF mode, though!

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12-26-2012, 07:36 AM   #11
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My understanding is that with any MF lens (my new Samyang 14mm included - which does not send focal length data to the camera) then only the centre point af indicator will function.

From a discussion we had on the UK forum a few weeks ago, I think it was made clear that the most reliable guide to focus confirmation is the green 'hexagon' light in the bottom of the viewfinder. This is solid green when focus is good - the red flashing indicator is only a guide to the area that is in focus.
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