From: "Russell Jocoy" 
To: frank{at}katestone.com.au, atm{at}shore.net
Reply-To: "Russell Jocoy" 






>From: "Frank Q" 
>Reply-To: "Frank Q" 
>To: "atmlist" 
>Subject: ATM Projector lenses
>Date: Wed, 5 Feb 2003 10:44:30 +1000
>
>
>Hi All
>
>During my various scrounging exercises, I have acquired several
>"projector" (???) objectives. Some came from old (and very cheap)
>slide projectors and some from micro-fiche readers. Some of these
>are in cased in solid well made aluminium barrels and some are housed
>in partially melted plastic barrels.
>
>I dismantled one of the plastic ones and found something *resembling*
>a Cooke triplet. It consisted of a 20mm diameter plano-convex, a
>5mm air gap, a 15mm bi-concave lens, a 5mm air gap and an 18mm
>plano-convex. The convex surfaces face outwards.
>
>Does anybody out there know what design these are likely to be??
>
>Can anybody suggest any astronomical use for these??
>
>Many thanks in advance
>
>Frank Q
("atm{at}shore.net")

    Frank, I have used an old slide projector lens for a spotting scope, or
viewfinder. Just use a cheap
eyepiece and find the focal length. A few pieces of PVC pipe and reducers,
a little flat black spray
paint and you are there. Now if you are talking about those short focal
lenght projection TV lenses
I have no idea...          RUSS JOCOY
("atm{at}shore.net")

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