(Maurice Gavin) wrote in message ...
On 23 Feb 2004 11:09:37 -0800, (Lurking Luser) wrote:

you could build a single objective lens refractor and fix
chromatic aberration....
Another dumb idea brought to you by,
James King

[snipe]

I've proved it works with sample colour spectra at

http://home.freeuk.com/m.gavin/chromab.htm

but will it 'fire' the Forum???

Actually I have been to your web page. That is where I got the idea.
Surplus Shed has a 127mm lens for only $6.50. The focal length is very
short though, only f/3.6. I think it might make a very good
spectrometer. As a telescope it would be terrible. But for six bucks
it sound like it is worth playing with.

Do you think adding a convex mirror at the end of the tube might help
to spread the spectra out? I was thinking of putting it at a 45-degree
angle so that the light comes out the side.

Great web page it really got me thinking,
James King