Re: [APML] Achromats?

["mstecker" <mstecker@dslextreme.com>]

Hello Tony, et. al.:

 

Tricolor with Tech Pan film is a wonderful thing.  If used with a telescope with poor optics it will bring out every possible aberration in the telescope, making them far easier to see than with color film.  You are correct that the image scale would be different with the RGB filters and those blue halos will be quite dramatic.

 

 

Michael Stecker
mstecker@dslextreme.com

 

My Web Site:
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----- Original Message -----

From: Tony Hallas

To: astro-photo@seds.org

Sent: Monday, July 08, 2002 9:31 AM

Subject: Re: [APML] Achromats?

What about doing tricolor with an achromat? Would you be able to focus each color at a time and then combine them digitally? Or would the different focus points create different image scales? Even so, Registar could straighten that out. By using a R, G, & B filter maybe nice work could be done with a cheap lens?

 

     Tony