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09-19-2019, 12:47 AM   #1
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Catch in focus using Pentax K70

My camera seems to be doing all the right things except shutter release at point of focus.
The procedure I use is as follows:



• Menu c4: Select Catch in focus
• Focus method AF
• Focus mode A.F.S.
• Focus centre weighted.
• Lens 1:1.7 M type 50mm

I assume there are no mode dial restrictions.
I am missing something but what it is has got me beat.
Thank you.

09-19-2019, 01:28 AM - 1 Like   #2
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QuoteOriginally posted by joerotheray Quote
My camera seems to be doing all the right things except shutter release at point of focus.
The procedure I use is as follows:



• Menu c4: Select Catch in focus
• Focus method AF
• Focus mode A.F.S.
• Focus centre weighted.
• Lens 1:1.7 M type 50mm

I assume there are no mode dial restrictions.
I am missing something but what it is has got me beat.
Thank you.
I thought it had to be in M mode on the dial, but could be mistaken.
Edit: And back-button focus should be disabled.
09-19-2019, 02:03 AM   #3
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QuoteOriginally posted by joerotheray Quote
My camera seems to be doing all the right things except shutter release at point of focus.

The procedure I use is as follows:







•Menu c4: Select Catch in focus

•Focus method AF

•Focus mode A.F.S.

•Focus centre weighted.

•Lens 1:1.7 M type 50mm



I assume there are no mode dial restrictions.

I am missing something but what it is has got me beat.

Thank you.
Do you see the focus confirmation light illuminate while changing focus?

09-19-2019, 02:03 AM   #4
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QuoteOriginally posted by joerotheray Quote
My camera seems to be doing all the right things except shutter release at point of focus.
The procedure I use is as follows:



• Menu c4: Select Catch in focus
• Focus method AF
• Focus mode A.F.S.
• Focus centre weighted.
• Lens 1:1.7 M type 50mm

I assume there are no mode dial restrictions.
I am missing something but what it is has got me beat.
Thank you.
Have you enabled aperture ring use in the menu ?

Pressing shutter button ?

ps Centre weighted is the metering mode, nothing to do with focus. With a manual lens the focus point automatically shifts to single centre and cannot be changed.

09-19-2019, 04:16 AM   #5
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QuoteOriginally posted by slartibartfast01 Quote
Do you see the focus confirmation light illuminate while changing focus?
Yes, I do.

---------- Post added 09-19-19 at 04:31 ----------

QuoteOriginally posted by joerotheray Quote
My camera seems to be doing all the right things except shutter release at point of focus.
The procedure I use is as follows:



• Menu c4: Select Catch in focus
• Focus method AF
• Focus mode A.F.S.
• Focus centre weighted.
• Lens 1:1.7 M type 50mm

I assume there are no mode dial restrictions.
I am missing something but what it is has got me beat.
Thank you.
Problem solved. Thank you all. I enabled aperture ring and tested by turning focus ring. Shutter fired. Now to mount on tripod and do the 'walk into focus' test.

(I forgot to mention that mode dial selection was shutter priority.)

Last edited by joerotheray; 09-19-2019 at 04:45 AM. Reason: To add a fact.
09-19-2019, 04:33 AM   #6
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QuoteOriginally posted by joerotheray Quote
Yes, I do.

---------- Post added 09-19-19 at 04:31 ----------


Problem solved. Thank you all. I enabled aperture ring and tested by turning focus ring. Shutter fired. Now to mount on tripod and do the 'walk into focus' test.
The shutter should fire when the focus is confirmed assuming you are fully depressing the shutter continuously. Strange.

Edit. I see you have it working now.
09-19-2019, 05:01 AM   #7
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QuoteOriginally posted by joerotheray Quote
Yes, I do.

---------- Post added 09-19-19 at 04:31 ----------


Problem solved. Thank you all. I enabled aperture ring and tested by turning focus ring. Shutter fired. Now to mount on tripod and do the 'walk into focus' test.

(I forgot to mention that mode dial selection was shutter priority.)
Walk in test failed. The shutter release button needs to stop at half depression when preparing for the 'walk in' shot. This does not happen.
09-19-2019, 05:14 AM   #8
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QuoteOriginally posted by joerotheray Quote
Walk in test failed. The shutter release button needs to stop at half depression when preparing for the 'walk in' shot. This does not happen.
You are misunderstanding "catch in focus" There is no automation involved. You need to hold down the shutter button and keep it pressed until the subject is in focus.

09-19-2019, 05:14 AM   #9
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QuoteOriginally posted by slartibartfast01 Quote
The shutter should fire when the focus is confirmed assuming you are fully depressing the shutter continuously. Strange.

Edit. I see you have it working now.
Yes thanks. I realize now for it to work as I want a remote is needed. Expecting the button to stop half way for me wander off and do the test is probably somewhat optimistic.
09-19-2019, 05:15 AM   #10
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QuoteOriginally posted by joerotheray Quote
I forgot to mention that mode dial selection was shutter priority.
Using a manual lens in aperture priority limits the lens to maximum aperture only.
09-19-2019, 08:00 AM   #11
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QuoteOriginally posted by joerotheray Quote
Yes thanks. I realize now for it to work as I want a remote is needed. Expecting the button to stop half way for me wander off and do the test is probably somewhat optimistic.
The work-around is to use a wired remote control that includes a lock for the release button.


Steve
09-24-2019, 06:19 AM   #12
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QuoteOriginally posted by stevebrot Quote
The work-around is to use a wired remote control that includes a lock for the release button.


Steve
Thanks, I had forgotten about that. I may follow that route.
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