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14 Nov 2018
Glad to announce of release of INDI Library v1.7.5 on 2018-11-14. A few drivers were added in this release as we continue to improve & stabilize existing drivers.
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TOPIC: Wrong exposure times with Canon DSLR?

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26887

Thanks for the report, I'll try to investigate this today.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26895

I just checked while camera in Bulb mode and I took the lowest capture possible for 600D (0.00025 seconds which is 1/4000). I used exiftool to check the CR2 and got this:
Exposure Time                   : 1/4000
Exposure Program                : Manual
Sensitivity Type                : Recommended Exposure Index
Recommended Exposure Index      : 3200
Canon Exposure Mode             : Manual
Target Exposure Time            : 1/4096
Exposure Compensation           : 0
Flash Exposure Compensation     : 0
Auto Exposure Bracketing        : Off
Long Exposure Noise Reduction 2 : Off
Flash Exposure Lock             : Off
Exposure Level Increments       : 1/3 Stop
Long Exposure Noise Reduction   : Off
Exposure Mode                   : Manual

Appears everything is fine. I tested for different exposures and not a single issue.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26896

I can not even set these short exposure times.

In the camera settings I get the log message:
2018-06-28T11:12:02: [ERROR] Requested exposure value (0.00025) seconds out of bounds [0.001,3600].

and in the capture window, it is limited to 3 digits after the comma. 0,0001 would be the shortest I can set.

Two informations: I am on a Mac with local settings set to German. We use "," as the decimal separator. It seems the localization is not consistent in capture window and the camera settings as the camera settings use "." and the caption module uses ",".

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Skywatcher Newton 200/1000 on EQ6-R
Skywatcher Mak 105/1300 on AZ GTi
StellarMate @ Raspberry Pi 3B+
ASI 290 MC guiding cam on APM 60 ImageMaster
Canon 7D DSLR or ASI 183 MC Pro

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26898

Enable logging and attach it here after you connect and try to capture.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26902

Ok, now the device driver crashed reproducibly.

What I did:

Starting Indi
On main control of the DSLR trying to set exposure to 0.00025 -> error message
Then setting to 0.001. Hitting enter
Photo is taken, driver crahes

Attached is the log
Attachments:

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Skywatcher Newton 200/1000 on EQ6-R
Skywatcher Mak 105/1300 on AZ GTi
StellarMate @ Raspberry Pi 3B+
ASI 290 MC guiding cam on APM 60 ImageMaster
Canon 7D DSLR or ASI 183 MC Pro

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26903

I took 4 pictures.

I selected exposure 0,001 (the lowest available in the GUI), added it to the sequence queue, activated. The picture was taken (CR2). The result in Exiftool is this:

Image Size : 5616x3744
Lens : 17.0 - 40.0 mm
Lens ID : Canon EF 17-40mm f/4L USM
Megapixels : 21.0
Preview Image : (Binary data 961395 bytes, use -b option to extract)
Scale Factor To 35 mm Equivalent: 1.0
Shooting Mode : Bulb
Shutter Speed : 1


So Exiftools tells me this was a 1s exposure (which is wrong, I heard it was much shorter than this). What's particularly irritating is the fact that the value in the exposure field changed to 0,010 all by itself after the picture had been taken.

I then took photos of 0,500s (CR2), 0,010s (CR2), and one last photo at 0,010s (FITS).

Exiftool tells me they all were 1s photos. They all look the same. It appears the exposure time has been the same in all 4 pictures. But it was not 1s as exiftool said.
Attachments:

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Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26904

[2018-06-28T14:04:15.980 CEST DEBG ][ org.kde.kstars.indi] - Canon DSLR EOS 5D Mark II : "[DEBUG] Finding optimal exposure setting for 0.050001 seconds in shutterspeed (count=1)... "
[2018-06-28T14:04:15.980 CEST DEBG ][ org.kde.kstars.indi] - Canon DSLR EOS 5D Mark II : "[DEBUG] Best match: -1 seconds Index: 0 "

I think this is where things go wrong...

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Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26905

I should add that after taking the 0,500s photo the value in the exposure field changed to 0,050 by itself (just like it changed to 0,010 after taking the 0,001s photo).

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Last Edit: by Herrhausen.

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26906

To make this even more confusing:

I had a look at the FITS images I took in parallel to the CR2s. There the exposure time listed is correct and matches the file name, however it was never really used. All images from 1/20 to 1/2 second look exactly the same.

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Skywatcher Newton 200/1000 on EQ6-R
Skywatcher Mak 105/1300 on AZ GTi
StellarMate @ Raspberry Pi 3B+
ASI 290 MC guiding cam on APM 60 ImageMaster
Canon 7D DSLR or ASI 183 MC Pro

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26913

The log file is oddly missing some key information... let me investigate that more since it's not the first time.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info
Last Edit: by knro.

Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26922

Yes, I believe having exposure times right is an absolute necessity. I'm ready to run as many tests as needed to hunt this bug down. Just le me know what I can do.

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Wrong exposure times with Canon DSLR? 4 months 2 weeks ago #26923

Under Options ---> Debug Levels, make sure "Driver Debug" is checked and then click "Save" in configuration. Then restart KStars and try to connect again, I think this is the problem of the complete debug log not showing up.

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Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info
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