From: Jim Chung <jim_chung@sunshine.net>

Date: December 10, 2011 12:03:20 PM MST

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] ISS Lunar Transit over Toronto ..... SUCCESS!

Quoting Milton Aupperle <milton@outcastsoft.com>:

Lastly you were not running at 24 fps.

Running at 24 fps 1600x1200 in 8 bit is 43.95 megabytes of data

streamed to disk.  FireWire 400 can not push more than 31.25 megabytes

across the wire (8000 packets per second and each packet is a maximum

of 4 kilobytes for Iso transfers). The best you would get is 17.07 fps

and that is under ideal conditions where each packet is completely

filled with 4096 bytes of data. That generally does not happen.

That's my bad.  In the back of my mind I was recalling an earlier discussion with Alan who reported that even under ROI the Scorpion can only deliver 24 fps despite the slider in AstroIIDC saying 30 fps.

Let's say I was getting 15 fps, dropped 2 so a total of 13 which agrees well with the 0.8s transit time.

Jim