From: Alan Friedman <alan@greatarrow.com>

Date: October 7, 2011 7:39:44 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Jupiter form this morning

Hi Jim,

The 1600x1200 Scorpion can't deliver more than about 26fps even with ROI optimization. You can set the capture rate at 30fps in Astro IIDC, but if your measure the capture duration/frame count you will find the actual number. For Jupiter, adequate contrast (for image processing) and high fps recording (to maximize the frames captured in the seconds of stable seeing) appear to be the most important considerations. F45 is most likely too much image scale and sampling... at least in our Great Lakes seeing.

best,

Alan

On Oct 7, 2011, at 9:26 AM, Jim Chung wrote:

Thanks Alan, I'm using the large Scorpion (I think you have the same
one) ROI'd to 600x500 for the 30fps rate. I'm always hoping that 16
bit will capture more nuanced detail but sounds like you feel 8 bit is
more than enough. I did experiment with Jupiter at f/45 and needed to
go down to 8 bit to get a decent frame rate.

Happy Thanksgiving!

Jim

Quoting Alan Friedman <alan@greatarrow.com>:

> Very nice, Jim. Are you using a monochrome PGR camera in 16 bit
> mode? I haven't found an advantage on Jupiter to use the greater bit
> depth with the corresponding offset in slower frame rate, though in
> my 10", I can just manage 30fps in 8 bit mode with the Flea3. I sat
> outside a little earlier than you last night. The seeing was
> moderately good I think... seemed to go downhill around 2:00am local
> time so I went to bed.
>
> all the best,
> Alan
>
>
>
> On Oct 7, 2011, at 5:33 AM, matt carmine wrote:
>
>> Jupiter from Toronto:
>>
>> http://dl.dropbox.com/u/4852049/JupiterRGBOct7.jpg
>>
>> Jim
>>
>>
>
>