Re: [APML] OT:Eyepieces

[Stuart Heggie <stuart.j.heggie@sympatico.ca>]

George, the 1000mm focal length with a 2x barlow will only get you 
2000mm and Mars is tiny even as close as it is. On 35mm film I bet you 
won't record anything but a dot. I have put a 2x apo barlow in the light 
path on my 1000mm Vixen achromat and I can just fill the frame with the 
crescent moon! On that point, the Meade #140 barlow is an apo but the 
cheaper ones are not. Interesting question re eyepieces, with four or 
five elements in the Plossls, I would expect they are apo.

Stuart

George Anderson wrote:

>This is a little off topic but it is related to AP work.
>With Mars being in a good position in a month and a half I am thinking
>about trying some projection photography.
>But what came to mind is are the common EP's (Plossl and Ortho)
>apochromatic or achromatic? Will I have colour fringing with these types
>if I don't use a M-V filter?
>Or with a 1000mm focal length would just using a barlow provide enough
>magnification on 35mm film?
>
>George Anderson
>Montreal Canada
>
>Clear skies and good health
>_______________________________________________
>Astro-Photo mailing list
>Astro-Photo@seds.org
>http://seds.org/mailman/listinfo/astro-photo
>
>  
>


_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo