| Joined: | Mon Apr 2nd, 2012 |
| Location: | South Lakeland, UK |
| Posts: | 4066 |
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Why not measure the size of the low pass filter Eric, the actual capture size is specified for each camera. If you cut two strips of clean paper the exact width and height specified and use them to compare with the size of the frame aperture around the LPF that should tell you how much over size it is, if at all, or even use an old slide or negative trimmed to size?
My expectation would be that the LPF aperture will be slightly bigger than the capture size, although depending on size of the rear element of the lens and it's distance from the sensor, the demand for the LPF frame aperture size will vary, the light rays approach the sensor in the form of a cone, just like the cone (pyramid?) of light from a projector lens to a cinema screen. So the smaller and closer the rear element is the the sensor the more unused margin there will be at the edges of the frame of the LPF. Remember the LPF frame is some distance, maybe four or five mm? from the focal plane, that is the sensor.
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Robert.