From: "doobisary" <tjp314@pacbell.net>
Date: November 7, 2012 9:08:30 PM MST
To: Astro_IIDC@yahoogroups.com
Subject: Re: ONAG Review
Here's a cool potential use of a combination of Astro IIDC and an ONAG that I've thought about, but don't have the time/resources to implement at the moment (but one of these days!):
Use the ONAG and a pair of firewire cameras to keep the scope centered on Jupiter with one while the other takes a multi-hour video of Jupiter, to monitor for impacts. One could set the frame rate to 1fps, which should be short enough to catch an impact but not so high as to make the video file unmanageable (for searching for flashes later). Even better would be if, say, 10fps could be acquired and combined on the fly to produce a sharper frame for that second than a single fram might provide. But I don't know if Astro IIDC could do that.
-Tim.
--- In Astro_IIDC@yahoogroups.com, Milton Aupperle <maupperl@...> wrote:
Hi Dave;
USB1 is 12 Mbps - known as "Full-Speed" - theoretical top rate of 1.5
megabytes per second.
USB2 is 480 Mbps - known as "Hi-Speed" - theoretical top rate of 60
megabytes per second.
USB3 is 5 Gbps - known as "Super Speed" - theoretical top rate of 640
megabytes per second.
However, a lot of the Astronomical cameras (like SBig, FLI etc.) are
listed as USB2 but have slow download rates in the seconds per frame.
For example, the LodeStar camera tops out at 10 fps (0.1 seconds per
frame) download rate when in Binned 2x2 mode (376x290 pixels frame)
and is a USB2 camera. That works out to about 1.04 megabytes per second.
A PGR FireFly MV USB2 camera runs as high as 60 fps @ 752x480 (21
megabytes per second) and when in binned ROI modes, could be as high
as 224 fps at 160x120 sizes.
HTH..
Milton J. Aupperle
#1106 - 428 Chaparral Ravine View SE.
Calgary Alberta T2X 0N2
1-(403)-453-1624
maupperl@...
www.members.shaw.ca/maupperl/
On 6-Nov-12, at 11:10 AM, Dave Goodyear wrote:
Arn't they just full speed 12mb/sec usb 2?
Dave Goodyear
Sent from my iPhone
On Nov 6, 2012, at 8:57 AM, "Milton Aupperle" <maupperl@...>
wrote:
Hi Dave;
Thanks for the information.
The other possible limit would be the cameras download rate. Most USB
2 Astro / Guide cameras are pretty slow at reading frames out tot
he PC.
TTYL..
Milton Aupperle
On 6-Nov-12, at 1:25 AM, Dave Goodyear wrote:
Hi Milton.
I was able to get the AO up to 15.6 hz on a bright guide star
using .
008 exposures. It seemed it wanted to go faster, i saw it go over
16 a few times.
Dave Goodyear
Sent from my iPhone
On Nov 3, 2012, at 12:35 PM, "Milton Aupperle" <maupperl@...>
wrote:
Hi Dave;
Very cool.
Can you comment on how fast it can make corrections at using a
fairly
bright Guide star?
TTYL..
Milton J. aupperle
On 3-Nov-12, at 1:28 PM, Dave Goodyear wrote:
I'm not going to get too involved with this discussion (:P ),
but I
do have and use the SX AO-L all the time.
Dave Goodyear
KB2 Networks Inc.
214 Main St. #318
El Segundo, CA 90245
310-933-2436
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