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Apo-Makro-Planar 120/4 focus trap feature?

 
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Apo-Makro-Planar 120/4 focus trap useful?
Yes
100%
 100%  [ 5 ]
No
0%
 0%  [ 0 ]
Total Votes : 5

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conurus
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Joined: 15 Aug 2006
Posts: 795
Location: Vancouver, Canada

PostPosted: Mon Jun 07, 2010 6:38 pm    Post subject: Apo-Makro-Planar 120/4 focus trap feature? Reply with quote

Right now the 645 firmware treats the Apo-Makro-Planar lens as a pure manual focus lens with focus confirmation and ignores the lens' aperture ring but do you think this feature is useful?

The Apo-Makro-Planar would fake and report to the camera body that it is an autofocus lens if the lens' aperture ring is set to anywhere from f/4 to f/32 and if the camera body is configured to be in ONE SHOT mode the shutter won't trip unless it is in focus.

You may keep the shutter depressed and turn the manual focus ring and the shutter will fire only if something is in focus.

Let's call this the focus trap feature.

This can be turned off if the lens' aperture ring is set to f/45.

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Joined: 14 Jul 2009
Posts: 18

PostPosted: Mon Jun 14, 2010 12:19 pm    Post subject: Reply with quote

My positive vote. BTW, would it be possible if the lens shots in normal manual focus when the aperture is between f/4 - f/32 while in focus trap function in f/45? It seems to be more logical and intuitive operation if the special function switch is set in the end aperture location? Please excuse my igorance if there is consideration in technicalities.
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conurus
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Location: Vancouver, Canada

PostPosted: Wed Jun 16, 2010 11:33 pm    Post subject: Reply with quote

My only worry is that it may confuse people switching back and forth between MP120 and real autofocus lenses. You have a great point, though and I will see if I can make the focus trap feature defeatable.
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PostPosted: Thu Jul 01, 2010 3:47 am    Post subject: Reply with quote

You're great! Thanks for your efforts.
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conurus
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Location: Vancouver, Canada

PostPosted: Fri Jul 02, 2010 2:19 am    Post subject: Reply with quote

To disable the focus trap feature for Apo-Makro-Planar 120/4:
Set camera's aperture to f/45, set lens' aperture ring to f/16.
Press DOF preview, and release it.
Set camera's aperture to f/11, set lens' aperture ring to f/22.
Press DOF preview, and release it.
Set camera's aperture to f/32, set lens' aperture ring remains at f/22.
Press DOF preview, and release it.
Set camera's aperture to f/16, set lens' aperture ring remains at f/22.
Press DOF preview, and release it.
Camera's aperture remains at f/16, set lens' aperture ring to f/8.
Press DOF preview, and release it.

To enable the focus trap feature again:
Set camera's aperture to f/45, set lens' aperture ring to f/16.
Press DOF preview, and release it.
Set camera's aperture to f/11, set lens' aperture ring to f/22.
Press DOF preview, and release it.
Set camera's aperture to f/32, set lens' aperture ring remains at f/22.
Press DOF preview, and release it.
Set camera's aperture to f/22, set lens' aperture ring remains at f/22.
Press DOF preview, and release it.
Set camera's aperture to f/16, set lens' aperture ring to f/8.
Press DOF preview, and release it.

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