Hello from Austria!

I have connected my Canon EOS Ra to an ASIair Plus and would like to create flat frames. Since the "auto" setting doesn't work with the flat frames on the DSLMs, I tried a manual exposure time. I use a homogeneously lit flatfield box as a light source and the result is that I always get flats of different brightness, even though the exposure time is constant.

Can you even create calibration files with the combination of ASIair and DSLM? Does anyone know this problem and have any suggestions for a solution?

CS Gernot

    Gernot 'Auto' setting should works.
    Could you check the parameter of the images? such as ISO, exposure time and so on
    And how many is the ADU value difference between these flat frames?

        Tech@ZWO

        Thanks for the quick reply!

        Today I did a test with the "auto - flat" function. The Canon Ra was connected to the ASIair using a USB3 cable and I used the flatbox again as the light source.

        It takes about 20 seconds to determine the optimal exposure time (the camera triggers very often). During the autorun (30 images) the avg values fluctuate between 22000 and 34000...

        I think that can't be right!?

        CS Gernot

            Gernot What is the value of ISO?
            Is it possible the light source of your flatfield box changed during imaging?

                Tech@ZWO

                The flats were shot at ISO 800 (like the lights) and the flatfield box was powered via the ASIair.

                  a year later

                  Gernot Hi .....Ermes from Italy. I currently have the same problem with both reflex and mirrorless cameras. Did you solve the problem? If so, how did you do it? Hi and thanks anyway.

                      2 months later

                      • Gernot

                        • Post #7
                        • Edited

                        b5193W4C

                        Hello Ermes!

                        Unfortunately, I haven't received a response from ZWO yet and the problem still exists.

                        When I start the "Autoflat" function, the camera takes several photos at once and all of them are overexposed. The application then terminates with an error message.

                        Is there any news about this problem @Tech@ZWO ?

                        CS Gernot

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