[ATM] How fast is too fast?

[Mike Lockwood <melockwo@uiuc.edu>]

Hi,

Jean-Guy Moreau wrote:
> Thanks again Vladimir for all the trouble  ;O)
> I might as well keep on figuring the 26" f/3.7 mirror i am
> now making. When used with a Televue Paracorr it should
> give good images, as i was able to verify with the
> smaller 10" f/3.3 i am now using.

After figuring several fast mirrors (30" F/3.8, 16" F/4, 8" F/3.9) 
that all give excellent images with a Paracorr), I can say I 
definitely enjoy making and using fast mirrors.  I will make more in 
the future.

The question is, how fast is too fast?  (In your opinion)

At what do you think that the Newtonian design really begins to 
suffer?  F/3.7?  F/3.5?  F/3.3?

I'm curious to know how the 10" F/3.3 performs with a Paracorr, and 
how tough it is to collimate.

Collimation has to become incredibly frustrating at some point, and 
since the Paracorr was designed for F/4.5 it can only do so much.

I'm curious to hear others' thoughts.

	Thanks,

	Mike Lockwood

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