[Author Prev][Author Next][Thread Prev][Thread Next][Author Index][Thread Index]

Re: [APML] Gamma Cygni

Hi Roland,
i use the Sky Watcher 102mm f/5 refractor. No filter was used ( i almost
never use any filter ). The E200, witch is poor in the blue, don't show very
well the chromatic aberration of this refractor ( a good thing ! ). A good
exemple is the double cluster picture that i've taked. No blue correction
was done in this pic and the blue color arround the stars is very small.
http://www.quebec-astro.com/Lamas_Double_De_Persee.htm

I have found that the Lumicon DSF do a strong magenta shift on the film.
Maybe normal but did i'll lose something in my objets done with this filter
( nebulae for most part ) if i had green to reduce magenta ? Any input from
regular user of the Lumicon DSF ?

Clear skies to all

Fred


----- Original Message -----
From: "Roland Roberts" <roland@astrofoto.org>
To: <astro-photo@seds.org>
Sent: Tuesday, May 13, 2003 10:37 AM
Subject: Re: [APML] Gamma Cygni


> -----BEGIN PGP SIGNED MESSAGE-----
>
> >>>>> "fc" == frédéric caron <astronome@videotron.ca> writes:
>
>     fc> here my last picture taken last week.
>
> You list a 102mm f/5 achromat scope as the instrument---what achromat
> are you using?  Did you use a filter, e.g., to reduce UV?
>
> regards,
>
> roland
> - --
>        PGP Key ID: 66 BC 3B CD
> Roland B. Roberts, PhD                             RL Enterprises
> roland@rlenter.com                            6818 Madeline Court
> roland@astrofoto.org                           Brooklyn, NY 11220
>
> -----BEGIN PGP SIGNATURE-----
> Version: 2.6.3ia
> Charset: noconv
> Comment: Processed by Mailcrypt 3.5.4, an Emacs/PGP interface
>
> iQCVAwUBPsEDPeoW38lmvDvNAQFRGwQAgD1tks0eFp0aZdH8+A7XopMPLJ3yyWUo
> a+NT9pkIJgWD3w8GgESFbtqc8vmuIHkTpeGHa5+gg7c/SiwyI3oJ26eBPqktlrE+
> KxjhLXtF5mvGpcKy5pkOu5rNaySTMij4laKbgTe7+g6cikzNVZGacx0hFBYsJ8wS
> 2L7yTKPPjl4=
> =oDwA
> -----END PGP SIGNATURE-----
>
> _______________________________________________
> 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