From: Milton Aupperle <milton@outcastsoft.com>

Date: May 7, 2011 2:54:59 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Info

Dear Davide;

There really isn't any "Right or Wrong", it's all "Trial and Error".  Likely start at 30 fps and see what you get.

Basically adjust the exposure time (or gain - though gain adds noise) until it's bright enough. Bright enough means the disk of Saturn is about 30% 60% brightness.

The easiest way to measure the onscreen spot brightness is using Apples "DigitalColor Meter" (in the Utilities Folder of the Application Folder").  Put the cursor centered on the disk will measure the brightness in various ways (%, 0 to 255, hexadecimal or 0 to 65535 ranges).

HTH..

Milton Aupperle

On 7-May-11, at 1:54 PM, Davide Urbinati wrote:

I use a 530 mm focal 4730 mm...

With grassoppher with icx 274 monocrome...pixel 4,4...

33 ms exposure at 30 fps...

I wrong?!

Thanks

Davide

Inviato da iPad