[ATM] Intro and slitless tester question

[mturner999 at sbcglobal.net (Michael D. Turner)]

At 03:27 PM 3/5/2004, David Harbour wrote:

>had such an arrangement, though I do not think I touched on that in the page
>about the tester. I have an email here somewhere that explains the
>arrangement (the way to mount the knife edge and the slit so that you have
>them both, functionally) if I can find it. Let me know if you would like to
>have a description of how I did this. My tester showed the slightest surface
>defects on a mirror, and also showed a mirror as fast as f/2 fully
>illuminated (12.5" Schmidt Camera Primary I figured), without even the
>slightest hint of the appearance of "false astigmatism". Let me know if you
>would like for me to find that email, any of you folks who are interested,
>and I can forward it to any one of you. It is rather longish, so unless all
>of you guys demand my description, I would rather not post such a long note
>here. Sorry I haven't commented on how I did this on my web pages.

yes, please do.
-Mike