Re: [ATM] Quartz test

[Mike Lockwood <melockwo@uiuc.edu>]

Gary,

GARY FUCHS wrote:
> Thank you for the photos and explanation. Your site's been helpful
> to me with several things. I hope you don't mind some questions:
> For the transmission test with the 4.25" scope, how far away is the
> quartz from the scope and laser? Does it matter? Do you need to
> move the quartz to have the laser go through different areas? I'm
> assuming you don't view the laser/star image directly - is that
> correct? Also assuming the laser isn't centered - does it matter
> where it's positioned as long as the beam clears the spider?

The collimator puts out a 24" diameter beam of collimated light, that 
is, light that is parallel, like star light.  The 4.25" sits in front 
of it, collecting a small portion of the beam to form a "star" image. 
  I put a ronchi grating in the focuser to get the ronchi image later 
in the page.

The quartz was right in front of the 4.25" as an optical window would be.

You can view the star image directly with a welding filter and an 
eyepiece.  It is not bright enough to damage vision, but it's not 
pleasant to view directly.

	Mike Lockwood


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