Re: [ATM] New site

["vladimir sacek" <vla@toast.net>]

Hi Aki,

Thank you. Obtaining Houghton aberration coefficients
was pretty straight-forward from the general thin lens
equations. It is really puzzling why this corrector type
isn't more in use. I just added a simple prescription for the
Houghton variation that is easiest of all correctors to make:
a pair of two plano- lenses with equal curvatures (one positive,
the other negative). In the Newtonian arrangement it has
1/2 the coma of the Maksutov counterpart, and 1/3 the coma
of the Schmidt-Newtonian. So - why not Houghton?

Vlad


----- Original Message ----- 
From: <aki.lotjonen@phnet.fi>
To: <atm@atmlist.net>
Sent: Monday, July 17, 2006 5:12 AM
Subject: Re: [ATM] New site


Hi Vladimir,

Very nice and interesting "put together" web-pages. I'm sure ppl find
your pages very useful. I personally happily noticed that you also has
a section for Houghton correctors.

Regards,
Aki Lötjönen

> For the reason that there were more important things to do,
> I spent last couple of months putting together a site on the
> subject of telescopes:
>
> http://www.telescope-optics.net
>
>
> To some extent unavoidably repetitive, but also with some
> interesting hard to find (on the Net) and original contents.
> After several editing sessions, I still run into occasional
> typos and incoherent thoughts. So, feel free to let me know
> for what can be bettered - I'll be thankful for it.
>
> Vlad
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
>


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