From: Davide Urbinati <dado_sanna@tin.it>

Date: May 7, 2011 1:54:10 PM MDT

To: "Astro_IIDC@yahoogroups.com" <Astro_IIDC@yahoogroups.com>

Subject: Re: [Astro_IIDC] Info

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

Il giorno 07/mag/2011, alle ore 18:12, Milton Aupperle <milton@outcastsoft.com> ha scritto:

It depends on the CCD (size of the pixels and whether it's a HAD or
EXHAD), Filters (if it monochrome), Aperture of the scope and Focal
length. So you'll have to experiment.

To give you an idea of exposures, here is what I have used in the
past. My skies generally suck for doing long (> 3 meter) focal length
work, except in very rare occasions.

For a MAK 127 mm aperture scope at 3,000 mm focal lengths using a Flea
Color camera (HAD CCD of 7.4 micron pixels), I was shooting at 7.5 fps
and 133 ms exposure.

http://www.outcastsoft.com/AstroImages/Saturn_MJA_20060411.jpg

For C8 200 mm aperture scope at 6,100 mm focal lengths using a Flea
Color camera (HAD CCD of 7.4 micron pixels), I was shooting at 15 fps
and 67 ms exposures.

http://www.outcastsoft.com/AstroImages/Saturn20070412.jpg

For C8 200 mm aperture scope at 5,000 mm focal lengths using a
Grasshopper Monochrome camera (ExHAD CCD of 6.7 micron pixels with
AstroDon "E" series LRGB filters), I was shooting at 15 fps and 67 ms
exposures.

http://www.outcastsoft.com/AstroImages/Saturn20090502MJA.jpg

There are other examples on my web site:

http://www.outcastsoft.com/AstroImages/AstroIndex.html

and I always list the focal length , aperture and exposure setting /
frame rate I used in my images.

HTH..

Milton Aupperle

On 7-May-11, at 3:49 AM, Davide Urbinati wrote:

>
>
> hi...
>
> witch settings i must use for photograph Saturn with point grey
> grassoppher?!
>
> Thanks
>
> Davide
>>