ATM 3" 75mm or 4" 100mm eyepieces

[K1JJ@aol.com]

At 01:02 PM 13/8/96 -0400, you wrote:

>>Hi!
>>
>>I am looking for a commercial, military or even home made 75mm 3" eyepiece
>>and a 100mm 4" unit. The diameters  of  3" and 4" respectively must be the
>>minimum, though the 75mm and 100mm specs can vary somewhat.

>>Otherwise...Does anyone know of a source of these or way to build them? 


> Hmmm. This almost sounds like you are describing a large 35mm camera lens.
>I wonder if using one would be better than scaling up a Plossl design (using
>a couple of 3 or 4 inch achromats as elements)?


Hi Mike,

Thanks for the idea.

I'm not really versed in "lens techniques"... Just exactly how would I take
say a cheap 3" Meade refractor and use it? How do you get the required 75mm
or 100 mm out of say an F10  3" or 4" refractor lens system?

Anyone else lend a suggession? I really need to build up an 75mm  3" and
100mm 4" eyepiece....I'm stuck with an F8.5 system here.


Tom Cathey