Go Back   IceInSpace > Equipment > Astrophotography and Imaging Equipment and Discussions

Thread Tools Rate Thread
Old 06-03-2011, 05:35 PM
RobF's Avatar
RobF (Rob)
Mostly harmless...

RobF is offline
Join Date: Jul 2008
Location: Brisbane, Australia
Posts: 5,507
The trouble with a shuttered camera like the QHY9 though is you have to shut a min 3sec flat, then it takes another 15-20secs to download if you're shooting unbinned. Even with the Sky Flats plug-in adjusting the exposure time, its tricky to collect too many flats in one go (especially if you double up with darks which then have gradually increasing times to match).

Don't get me wrong - I LUV my QHY9 though

I like to have a bias library too in case I go nuts on the night and shoot an exposure length I've never done before - Pixinsight or Maxim can then worry about scaling as required the master dark cal frames as Robin says.
Reply With Quote
Old 08-03-2011, 09:35 AM
troypiggo's Avatar
troypiggo (Troy)
Bust Duster

troypiggo is offline
Join Date: Nov 2008
Location: Brisbane, Australia
Posts: 4,830
Phew. Just finished a run of calibration library shots. 20 hour marathon non-stop, and that was only the ones taken at -10deg as a starter! 20 darks each of 1x1 and 2x2 binning, at 5secs (for flat-darks), 5 mins, 10 mins, and 15 mins, plus biases at each bin (in case I need them for some reason, but shouldn't if using darks and flat-darks)

BTW I'm using Nebulosity and the Nebulosity Sequence Generator - what a fantastic supplementary program that is! And free!
Reply With Quote
Old 09-03-2011, 09:07 PM
marki's Avatar
Waiting for next electron

marki is offline
Join Date: Mar 2008
Posts: 2,427
Don't burn your camera out before you point it at something worth taking a pic of Troy .

Reply With Quote
Old 09-03-2011, 10:01 PM
Benny L (Ben)
Registered User

Benny L is offline
Join Date: Dec 2005
Location: Carmel - Perth Hills
Posts: 303
Originally Posted by Tandum View Post
Troy, I normally shoot a cal library twice a year. One as summer starts and a new one when winter starts. I know I can easily achieve -20C in summer and -30C in winter so I shoot at the right temp for the season. I find it normally takes over 24hours to do a full set of cal files ranging from 20min to 60sec for darks binned x1 and x2, a dozen each, plus bias files for x1 and x2 about 30 each. I don't capture at x3 or x4 so don't bother with cal files for them.

I would of course reshoot for the current season if I updated drivers or similar on the system.
Reply With Quote
Old 09-03-2011, 11:02 PM
DavidTrap's Avatar
DavidTrap (David)
Really just a beginner

DavidTrap is offline
Join Date: Jun 2009
Location: Brisbane
Posts: 2,828
I just finished the 24hr run. I added in some 30, 60, 120, and 180sec exposures. I was running -15degrees, with the cooling power at 88-92%. I did leave the air-con on in that room today though.

400 images, 3.87Gb of data - currently being backed-up to the network storage box and will be burnt to DVD as well!

Troy - I guess this means we'll have a cloudy weekend to look forward to!


Last edited by DavidTrap; 09-03-2011 at 11:03 PM. Reason: added bit
Reply With Quote
Old 10-03-2011, 06:41 AM
troypiggo's Avatar
troypiggo (Troy)
Bust Duster

troypiggo is offline
Join Date: Nov 2008
Location: Brisbane, Australia
Posts: 4,830
Reply With Quote


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +10. The time is now 01:10 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
OzScopes Authorised Dealer
SkyWatcher Australia
Lunatico Astronomical
Celestron Australia
Meade Australia
NexDome Observatories
Astronomy and Electronics Centre