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07-11-2016, 10:59 AM   #1
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autofocus in LV

I bought the K1 body only; so I tried it with some of my AF analog lenses. When it focusses in Live view, it turns the lens to its minimal distance and then to the correct setting.
When not in LV it focusses to the correct distance immediatly.

07-11-2016, 11:19 AM   #2
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That is the difference between the two modes, phase detection, where the direction to the correct distance is known. contrast autofocus where the direction is not knowable
07-11-2016, 12:05 PM   #3
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QuoteOriginally posted by hugoke Quote
I bought the K1 body only; so I tried it with some of my AF analog lenses. When it focusses in Live view, it turns the lens to its minimal distance and then to the correct setting.
When not in LV it focusses to the correct distance immediatly.
Yup, this is the normal behavior. However, a positive side-effect of this is that live view focusing is not subject to front focus or back focus.

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07-11-2016, 12:41 PM   #4
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QuoteOriginally posted by hugoke Quote
I bought the K1 body only; so I tried it with some of my AF analog lenses. When it focusses in Live view, it turns the lens to its minimal distance and then to the correct setting.
When not in LV it focusses to the correct distance immediatly.
At least yours finds focus eventually. Live view af on my K1 makes a lot of noise but rarely locks onto anything.

07-12-2016, 12:46 AM   #5
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My oldest 28-80, the heavy black one, sure makes a racket, to the point that a was afraid it was going to fly off, But it focusses OK.
07-12-2016, 12:55 AM   #6
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QuoteOriginally posted by Wheatfield Quote
At least yours finds focus eventually. Live view af on my K1 makes a lot of noise but rarely locks onto anything.

Don't point it at a uniform surface, Wheatfield, or something in shadow.


'Contrast Detection' needs something both light and dark under the focus point at the same time.
07-12-2016, 05:54 AM   #7
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QuoteOriginally posted by clackers Quote
Don't point it at a uniform surface, Wheatfield, or something in shadow.


'Contrast Detection' needs something both light and dark under the focus point at the same time.
I know how to make AF work.
07-12-2016, 05:20 PM   #8
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QuoteOriginally posted by Wheatfield Quote
I know how to make AF work.

Then why does our Live View work, and yours not?


I even use the phone app to take portraits, and that relies entirely on Live View.

07-12-2016, 05:58 PM   #9
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Could be lens..
07-12-2016, 07:20 PM   #10
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QuoteOriginally posted by Tesla Quote
Could be lens..
It could be. I don't have a lot of AF lenses. The 3 FA Limiteds, an FA 24/f/2 and the DFA 100 macro. The all just rack back and forth from lock to lock. It's not a biggie, I use the viewfinder most of the time, and if I'm in live view I'm probably manual focusing anyway.
07-12-2016, 09:00 PM   #11
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QuoteOriginally posted by Wheatfield Quote
The 3 FA Limiteds, an FA 24/f/2 and the DFA 100 macro. The all just rack back and forth from lock to lock.
Something badly wrong with your camera, there ...
07-14-2016, 04:59 PM   #12
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QuoteOriginally posted by clackers Quote
Something badly wrong with your camera, there ...
It works in every other respect. I've gotten used to Pentaxes having some quirks.
07-14-2016, 11:02 PM   #13
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QuoteOriginally posted by Wheatfield Quote
It works in every other respect. I've gotten used to Pentaxes having some quirks.
Your case is really odd. For a DSLR, it's the CDAF system that has copy-to-copy variation.
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