[ATM] Star testing an uncoated mirror? No luck.

[Jerry]

It wasn't a crow...
It was a glint of sunlight in a Raven's eye.  
:-)

I have recently star tested a couple of 6" mirrors. I did so in the
telescope and collimated indoors prior to taking the scope outside.  It can
be a pain to collimate an uncoated mirror and next to impossible in the
dark.  It helps to block all light from the back end of the tube while
collimating.

Jerry


> -----Original Message-----
> From: Guy Brandenburg
> 
> 
> BTW - how on earth does somebody do a star test on a mirror by using the
> reflection off the eye of a crow, as was related to me by John Dobson? Or
> is that just a myth, promoted by a mythical being?
>