Continuation: Sensor Size, Present & Possibilities

Started Apr 10, 2013 | Discussions thread
Erik Magnuson
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Difference w/o a useful distinction
In reply to olliess, Apr 10, 2013

olliess wrote:

Supposing you really want to argue about this, do you think that no light shines on the FF sensor outside of the APS-C frame when DX crop mode is activated? Even allowing for a dedicated DX lens?

So what if light shines on the sensor?  If using a lens with a larger image circle, light shines on parts of the mount throat outside of the image area as well.    If the sensor only reads out the subset of pixels that form the final output image size, what light falls elsewhere is rather unimportant as long as it's not reflected into the image area.

Some of the practical differences between case #2 and case #3 are:

  • Does the camera provide viewfinder information that indicates the actual recorded image area?
  • Can the camera operate faster by only reading out the active subset of the pixels?
  • Does the camera meter using this area (change the center weighting or only use that part of the matrix?)
  • Does the camera display only the selected area for review?

For all of these, it's quite unimportant if the masking is physical or electronic.

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Erik

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