From: Alan Friedman <alan@greatarrow.com>

Date: October 4, 2007 11:20:07 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Narrowband Venus

Hi Milton -

Thanks for the note. Here are the settings used for the 9-24 session:

Focal length:  @7.5 meters - f30

Gamma:  1.31

Brightness: 899

Black Point: 0

Exposure: 66.67 ms

Sharpness Limiting On: 0

Dark Frame Subtraction On: 0

Flat Frame Correction On: 0

Imaging at this bandpass gets pretty difficult as the sky brightens due to scatter - one could shoot in IR all day long, I expect.

I shot Venus in CaK again this morning in more stable air (I had my first decent lunar session in more than a year) - I dropped the exposure down to 133ms. Will see how these turn out. 

best regards,

Alan

On Oct 4, 2007, at 12:51 PM, Milton Aupperle wrote:

Hi Alan;

Nice Venus images. The cloud detail with the CaK filter is interesting. I had little luck with Venus and seeing any clouds when it was that thin a crescent.

What focal length were you shooting Venus at and what sort of exposure times with the CaK filter?

.