Focus mask

NNN634224269618403490

• 2013年05月24日 16:11

A recent image professor post discussed the Focus Mask, and stated

"I do not recommended using the Focus Mask with images taken with a pocket-sized camera with a small pixel size at high ISO values, unless you tune the threshold to a high number."

I'm shooting store layouts and products with a Nikon D800e at ISO 200, (nikon 16-35, 85, 50, tripod mounted, all NEFS,) and the focus mask consistently selects out of focus areas of an image, while ignoring sections clearly in focus. This behavior occurs no matter what the threshold setting, and with all Nikons I have, including the D700 at ISO 200 with 85mm G lens (even w/ MicroNikkor 105) and a D5100 used by my associate.

I have filed a support case on this with no help in the past.
Currently using CP1 7.1.2 on iMac intel i7 w/ 16 G ram on OSX 10.8.3.

Anyone else see this issue?

Thanks.

John
Birmingham AL USA

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  SFA

  • 2013年05月24日 16:57

  John,
  
  Yep. I always wondered about the feature.
  
  After reading the post though It occurs to me more strongly that one needs to be quite selective about how to use it and that it may only have relavence in some situations.
  
  In effect we need to consider where we want things to look sharp and then assess only those areas and even to do that on a comparative basis.
  
  Lets say we take ten shots of a model focused on an eye. Someparts of the eye in some of the shots will look sharper than others. Rather than a absolute focus assessment the tool probably better fits the "Which if these 10 images looks the sharpest on or around that eye?" In reality an aid to relative assessment of the parts we expect to be sharp rather than an indication of absolute sharpness. If you see what I mean.
  
  I could be wrong though so I'm look forward to input from others.
  
  
  Grant Perkins

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