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  • Re: ading lens

    Jack, I assume, in the first part, you were using mm (500mm and 300mm) but in the last sentence you were using cm (F=30 and F=50). Anyway, the formula for a

    mjcw500@att.net 4 days ago
  • ading lens

    I remember a java script that give the total lens for a x2 plano convex for exemple if you push 2 500mm at about 10mm each other that give you

    savardjacques@ymail.com 5 days ago
  • Re: field of vew

    Jacques, Fields of view are determined by the lens designer and/or manufacturer. It all depends on how much aberration you will tolerate. Starman Paul

    pvalleli 7 days ago
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Group Description

This Group is for the FREE exchange of ideas related to Amateur Telescope Making (ATM).

Have fun, be kind, play fair, learn, teach, participate.

Here's a contributed photo of a homemade 22 inch tube (before painting) for an Astrograph built by Dave Tandy. The full size photo can be viewed by ATM_FREE members in the "Photos" section. Check out the ATM_FREE Group's discussion for more info on this project and other things we are doing.

Ken Hunter

Group Information

  • 1601
  • Telescopes
  • Jun 1, 2002
  • English

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