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 01/24/2006 11:36:56 AM · #51
Originally posted by Bebe:
Originally posted by Bear_Music:
To be very specific, assuming the same reproduction ratio of subject to image size, the DOF will be identical at any given aperture regardless of the focal length of the lens or sensor size.

R.


Uh oh. I thought I was understanding, but now I'm lost again. Bear, are you disagreeing with dwterry, or have I missed the point?


No, he's just saying it a different way - in two respects:

1) He talks about the image reproduction ratio (i.e. how big the subject is in real life related to how big the image is on the sensor). You can think of this as a simplified explanation of the effects of focal length, distance and sensor size.

2) He also noted that I was redundant. An f/stop is a ratio of the focal length of the lens to the diameter of its aperture. Sometimes we just call it aperture instead of f/stop. Anyway, the point is ... if you've already identified the aperture (which is a ratio of the focal length) then the specific focal length is unnecessary as long as the resulting image size on the sensor is the same.

Does this make it any clearer? If not ... just realize we're saying the same things. :-)
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