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Dark Frame error message


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#1 harbaugh

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Posted 21 January 2008 - 11:02 AM

Well, at the risk of wearing out my welcome here, I have another question.

Dragged all the stuff out to the back yard last light because it was clear again.  Second night this week!

Came from a very warm house to about 25F.  I took the scope and camera out to cool down, came in for a snack, and then went back out after 30 minutes.  Took about another 30 minutes to connect everything and get the scope aligned.

After the CCD had been out for at least an hour, I started to try some imaging.  Took a set of darks, but when the camera was finished it displayed a message like, "No dark frame found for 'x' sec. exposure at 'x' degrees.  Retake darks."  It would then not accept a check in the subtract darks check box.

Over the course of the next hour I tried 2 more times to take darks with the same error message, just different paramaters for the exposure and temperature.  I double checked to make sure that the dark frame exposure times more than covered the actual exposure times I planned to use.

Now what have I done wrong?

Thanks,

Bob

#2 Mark Sibole

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Posted 21 January 2008 - 03:34 PM

try going into the ctrl tab and set your dark varience a little wider like 3 or 4 deg.
This way if the dark is within 3 or 4 degrees it will work.
If you were unable to select the dark drame box make sue you dont have the live exposure checked as if there isnt a dark for that time and temp it wiill keep unchecking.
I always shoot a 2 secons dark to help eliminate this problem.
If you have your variance set to about 4 so long as your time and within 3 or 4 degrees of the temp you should have no problems.

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#3 Mike7Mak

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Posted 21 January 2008 - 06:04 PM

Bob,

I'm not great at the conversions but I think 25F is in the minus celsius range. Envisage has this little quirk... when the temps are minus celsius Envisage labels the dark frame files with both a plus and a minus sign.

Your dark frames are there, you just have to go to the dark frame directory and use Windows "rename" function to remove the plus sign from the file names. I just ran into this problem recently myself.

...........Mike

http://autostarsuite...hotos/mike7mak/

LX200gps 7" Mak
Takahashi FS78
DSIpro, DSIpro2
41deg 50' N
73deg 44' W

#4 Mark Sibole

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Posted 21 January 2008 - 07:35 PM

Mike,
Thanks for that reminder.
It has been fixed in version 7.3 and I forgot about that.
Bob
What you need to do is open your dark folder and look for all of your images with the +- on the temp and remove the + from each image.
I didnt realize on the conversion as Mike stated you may have been below zero so that is why it couldnt find the dark.
Sorry for my memory lapse.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#5 Mike7Mak

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Posted 22 January 2008 - 02:12 AM

Hi Mark,

I had forgotton about it myself and got the answer from Stephen Hamilton a few weeks ago. Glad to hear it's been fixed.

...........Mike

http://autostarsuite...hotos/mike7mak/

LX200gps 7" Mak
Takahashi FS78
DSIpro, DSIpro2
41deg 50' N
73deg 44' W

#6 harbaugh

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Posted 22 January 2008 - 04:37 AM

Thanks, guys.

I do appreciate your help, but this is getting pretty frustrating.  I just shelled out $700 for a CCD that doesn't even have the latest software, pathetic documentation, and is incrediably difficult to use?  So how do I get the latest version?


I noticed that wierd naming convention while brousing through the files one day, but didn't think anything about it.  But I still don't understand why I get the error message at the end of the dark process.  It not as though I was trying to image and the software couldn't find an appropriate dark frame.  The message appears at the end of the dark process before it says to uncover the scope.  Is it double checking itself?  That is does it look back over the files to make sure everything is there, but can't find them because of the +/- file name?

Thanks,

Bob

#7 Mark Sibole

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Posted 22 January 2008 - 07:04 AM

Bob,
Version 7.3 comes with the DSI III series right now but it should be available as a general update soon.
What version do you have now?
Did you get the update from the Meade site yet for the latest version available?
http://www.meade.com/autostar/update/.


Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#8 harbaugh

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Posted 22 January 2008 - 09:35 AM

Mark,  Version 3.23 of AutoStar came with my DSI Pro II.  Yes I downloaded Version 4 from Meade and installed it (3 times), but apparently when you do that, the upgrade is not reflected in "Help/About AutoStar" as it still says 3.23.  I finally checked the files themselves in Windows Explorer and saw that many of them had the date of my install, so I assume it worked.

Envisage Help/About says Version 5.85.

Regards,

Bob

#9 Mark Sibole

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Posted 22 January 2008 - 12:45 PM

OK you should have the current version.
Once you fix the + - issue you should be all set.
If you have any problems dont hesitate to e mail me direct.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#10 harbaugh

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Posted 23 January 2008 - 04:22 AM

So, are you saying that I will still have to change the name every dark frame file taken below 0 celcius until new software is available?

Let me ask again about this dark frame library that you have mentioned.  If I accummulate all my dark frames, and it turns out that one I took last Tuesday just happens to have the right exposure time and temp for one of tonight's images will the software use that one? 

Thanks,

Bob

#11 Mark Sibole

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Posted 23 January 2008 - 05:33 AM

Yes untill the fix is released you will need to change the name manually for each exposure below zero.
And yes if you have a dark frame library built  with different temps and exposure times  it dosnt matter what night it was captured  when you use auto dark subtract Envisage will search for a dark frame matching your light frame or select the closest temp and time frame.
So you coulkd shoot darks like I do for different temps and make a library so when you go out you will have a dark drame to match your light exposure and temp.


Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com




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