[meteorite-list] [specialastrooptics] Special Lenses for Astronomy

[Ed Majden]

New Newsgroup on Yahoogroups.ca
Ed

Begin forwarded message:

> From: Ed <epmajden at shaw.ca>
> Date: December 29, 2009 12:15:02 PM PST
> To: specialastrooptics at yahoogroups.ca
> Subject: [specialastrooptics] Special Lenses for Astronomy
> Reply-To: specialastrooptics at yahoogroups.ca
>
>
> I created this newsgroup in order to obtain information on special  
> optical lenses like surplus military lenses, ultra high speed  
> lenses for use in faint meteor recording, direct image on film,  
> with image intensifiers, etc. I am especially interested in the  
> Super Farron f/0.87 - 72 mm f.l. lens that was used by NASA/LRC for  
> a faint meteor spectra patrol back in the 1960/70s. This type of  
> lens was used for aero imaging, x-ray imaging, and CRT recording. I  
> have the latter which is designed for 4:1 imaging of a CRT screen.  
> My question is, can you make this lens focus on objects at  
> infinity? Does anyone have any information on this lens type? I  
> can't get it to focus on objects at infinity unless I remove one of  
> the rear elements. Is this a normal practice or is there another  
> attachment lens that will provide good focus at infinity?
>