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DSI-III darks


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#1 cannon

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Posted 12 May 2008 - 08:22 PM

Anyone having problems with the software not subtracting the darks?

#2 Mark Sibole

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Posted 12 May 2008 - 08:42 PM

There are occasional people having problems but its generally operator error.
What kind of problems are you having?
Make sure you have auto dark subtract selected.
Make sure you have a dark frame for that time and temp.
Many times auto dark will turn it self off if you dont have the dark frame for the live exposure.
Let me know as much as you can and we will see if we can get you up and running.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#3 cannon

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Posted 13 May 2008 - 03:16 AM

I have had the DSI-I and II. I loaded a fresh batch of darks right before trying to take a picture. It seems as though unless you are pointing at a bright star or planet the picture is just pixalated. I have tried 1 second to 1 minute. When I have the dark box un-checked it seems to work normal only you can see the pixals that the darks are supposed to take care of.

#4 Mark Sibole

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Posted 13 May 2008 - 05:59 AM

Can you e mail me the images you are referring to so I can look at them?

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#5 cannon

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Posted 13 May 2008 - 12:00 PM

Here are 2 of them.

#6 Mark Sibole

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Posted 13 May 2008 - 06:18 PM

At this resolution they look pretty normal to me.
Even with dark subtract you will still get a stray hot pixel.
This can be resolved with a median combine or sigma reject.
Even using sigma and median combine it can leave a few hot pixels.
I usually just clone them out.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#7 cannon

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Posted 13 May 2008 - 06:27 PM

Theese were taken as tiffs and resized. This is not an acceptable image for a $1300.00 camera. The DSI-II color takes a 100% night and day shot compared to the DSI-III. There is a software or camera problem.
These should have been crystal clear with (10) 1 minute exposers taken with a 10" SCT w/UHTC on a clear night. Here is a shot from a DSI-II of the ring nebula. I would say there is a problem when you compare the two.

#8 Mark Sibole

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Posted 13 May 2008 - 06:57 PM

Send me the full size image via e mail.
Like I said at the small image scale I cant compair anything.
I can tell you that getting the same info in the same amount of time will not happen.
Although the DSI III has higher resolution it has smaller pixels and it will take a bit longet to fill the wells.
The DSI II has larger pixels that fill faster and you will get more info faster but at a cost to the resolution.
You will also notice with the iii series the dark frames need to be a lot closer to temp for a good dark subtraction.
Have you downloaded version 7.5 of Envisage?
From my initial tests it seems to work a bit better .
We will keep working on this untill we get it fixed.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#9 cannon

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Posted 13 May 2008 - 07:12 PM

They are on the way right now.




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