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RE: Measuring Focal Length
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Robert May on May 29, 2000 21:26:19 UTC |
The last thing to do when putting a telescope tube together is to mount the primary mirror. This is so you can actually test where the primary needs to go for the proper focuser height. Use a very short FL EP (4.6mm) for the in end of the focuser and use a barlow if you have one to verify the distance. You may want to put several holes in for the primary as you will want to mount the primary closer to the secondary for doing photos as the focal plane of a camera is a lot further out than any EP.
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