Re: [ATM] Astronomical Absurdities

[George Anderson <georgea@cam.org>]

Hi Art

The only shaving mirror I have tested was a 5" mirror that was about
f/1.5, first thought would be a schmidt camera or an SCT.
Just for fun I placed it on my Ronchi tester. To get an idea of the
Ronchigram have a look at a topo map of the Adirondacks. The swirls were
absolutely wild.
It might be good (ok it is good) for shaving, but then 90% of that is
based on tactile feedback.

George Anderson
Montreal Canada

Clear skies and good health

artbianconi@blast.net wrote:
> 
> Every morning I look into a shaving mirror and think of that
> telescope that some one was said to have built last year at
> Stellaphane using a watermelon for a tube!
> 
> I've no aspirations of doing anything with a watermellon except
> perhaps eating it but this shaving mirror continues to be a
> distraction. It's an 8 inch diameter and has a F/L of about 18". It's
> thin and appears to lend itself to that threaded bolt technology that
> one member the NJAA played with for bending the mirror.
> 
> I have no aspirations of doing anything with this if for no other
> reason than the simple fact that I am over-extended now by other
> substantially more important things.
> 
> Still, I'm curious. Has anyone ever attempted to make a reflector
> telescope out of a shaving or make-up mirror? Even as a joke?
> 
> I know this question will generate volumes on why it would never
> work. That's OK but has anyone tried?
> 
> Art
> 
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