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hugoke · 07-11-2016, 10:59 AM

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.

joergens.mi · 07-11-2016, 11:19 AM

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

Adam · 07-11-2016, 12:05 PM

Originally posted by hugoke

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.

Wheatfield · 07-11-2016, 12:41 PM

Originally posted by hugoke

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.

hugoke · 07-12-2016, 12:46 AM

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.

**clackers** · 07-12-2016, 12:55 AM

Originally posted by Wheatfield

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.

Wheatfield · 07-12-2016, 05:54 AM

Originally posted by clackers

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.

**clackers** · 07-12-2016, 05:20 PM

Originally posted by Wheatfield

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.

Tesla · 07-12-2016, 05:58 PM

Could be lens..

Wheatfield · 07-12-2016, 07:20 PM

Originally posted by Tesla

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.

**clackers** · 07-12-2016, 09:00 PM

Originally posted by Wheatfield

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 ...

Wheatfield · 07-14-2016, 04:59 PM

Originally posted by clackers

Something badly wrong with your camera, there ...

It works in every other respect. I've gotten used to Pentaxes having some quirks.

**clackers** · 07-14-2016, 11:02 PM

Originally posted by Wheatfield

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.

07-11-2016, 10:59 AM	#1
hugoke New Member Join Date: Apr 2016 Posts: 10	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, 12:05 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Originally posted by hugoke 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. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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07-11-2016, 11:19 AM	#2
joergens.mi Veteran Member Join Date: Jan 2012 Posts: 408	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, 12:41 PM	#4
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,991	Originally posted by hugoke 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
hugoke New Member Join Date: Apr 2016 Posts: 10 Original Poster	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
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Wheatfield 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
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,991	Originally posted by clackers 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
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Wheatfield 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
Tesla Pentaxian Join Date: Mar 2013 Location: Washington State Posts: 589	Could be lens..

07-12-2016, 07:20 PM	#10
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,991	Originally posted by Tesla 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
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Wheatfield 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
Wheatfield Moderator Join Date: Apr 2008 Location: The wheatfields of Canada Posts: 15,991	Originally posted by clackers 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
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Wheatfield 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.

autofocus in LV

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