Re: [APML] OT: ccd widefield: Antares/Rho Ophiuchus inHaGBusing200mmf/4

Hi Richard,

It's the colors. The HaGB produces different colors than is usually seen in normal images. It's not an objectionable difference, just different. Gives a unique perspective.

Gary

----- Original Message -----

From: Richard Crisp

To: Discussion of Film Astrophotography

Sent: Wednesday, June 15, 2005 10:36 AM

Subject: Re: [APML] OT: ccd widefield: Antares/Rho Ophiuchus in HaGBusing200mmf/4 Pentax 6x7 lens and IMG6303

thanks Gary

How is it different looking? I keep hearing people say that but I can't quite figure out what is different about it.

can you help me understand? To me it sort of looks like a film image but what do I know?

----- Original Message -----

From: GARY HATFIELD

To: Discussion of Film Astrophotography

Sent: Wednesday, June 15, 2005 7:35 AM

Subject: Re: [APML] OT: ccd widefield: Antares/Rho Ophiuchus in HaGB using200mmf/4 Pentax 6x7 lens and IMG6303

Really different looking Richard! It's always refreshing to see your images.

Gary

----- Original Message -----

From: Richard Crisp

To: Discussion of Film Astrophotography

Sent: Monday, June 13, 2005 8:12 PM

Subject: [APML] OT: ccd widefield: Antares/Rho Ophiuchus in HaGB using 200mmf/4 Pentax 6x7 lens and IMG6303

this is first light of the IMG6303 used with a new Pentax 200mm f/4 Medium Format Lens. I have recently made a new adaptor for attaching the lens to the combination of the filter wheel and focuser (DF2).

I have a couple of alignment issues I want to check out before next session but I am pretty happy with this initial result.

http://www.narrowbandimaging.com/antares_pentax200_6303_HaGB_page.htm

I used 15 minute sub exposures for the Halpha ( 4 total) and 3 minute subs for Green (10 total) and 5 minute subs for Blue (6 total). Total time was 2 hours.

Originally I planned to take RGB plus Ha but I ran out of time before I could get the Red data shot. So I just used Ha for the Red.

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Re: [APML] OT: ccd widefield: Antares/Rho Ophiuchus inHaGBusing200mmf/4 Pentax 6x7 lens and IMG6303