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Finding

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Posted by Robert May on October 28, 2002 20:13:46 UTC

That's the way to do it. The problem is that you aren't doing it with pinpoint sources and inspection telescopes to see the focus point and everything mounted to a light bench so you just aren't going to be getting the accuracy.
The formula works fine for any distance between the source, optic under test and the target. Note that the limiting case is the source being infinitely far away and the target is the focal distance of the optic.

Follow Ups:

Finding - johns - October 28, 2002 - 21:52 UTC
- Focal length - danieldgj - October 29, 2002 - 00:30 UTC
  - Focal length - johns - October 29, 2002 - 01:51 UTC
    - Order of assy. of tube. - bobmay - October 29, 2002 - 20:13 UTC
    - Can you borrow a scope? - danieldgj - October 30, 2002 - 05:13 UTC

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