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Asiair flats problem [Deep Sky] Acquisition techniques · TiagoAstro · ... · 4 · 137 · 1

TiagoAstro 0.00
TiagoAstro
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Hello, I come to you because I have a recurring problem when I make the flats with a Canon eos 60Da, an asiair mini, with a white sheet on the blue sky at the focus of a tube 150/750. There is also a filter IDAS LPSD2.
Some images are OK but others are strange (attached). Do you know why? 
Thank you very much.
IMG_1603.png
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mcchurchmouse 0.00
Benjamin DeHaven
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I don't have an answer for you, but a follow up question. Do you get this type of frame mixed in with normal results, or is it sometimes you get results all like this and the rest of the time all normal?
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TiagoAstro 0.00
TiagoAstro
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Benjamin DeHaven:
I don't have an answer for you, but a follow up question. Do you get this type of frame mixed in with normal results, or is it sometimes you get results all like this and the rest of the time all normal?

***Out of about 30 photos, I have maybe 5 like these randomly among the 30.  ***
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mcchurchmouse 0.00
Benjamin DeHaven
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Odd… looks overexposed to me. Almost like shutter is staying open too long or you have autoISO on. Can you confirm the metadata (recorded shutter speed and ISO) for the normal and the odd flats are the same? I don't use a dslr anymore nor have I ever used an ASIAIR so I'm reaching here. Hopefully with this additional information someone will come along and know the answer as to WHY this is happening…
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TiagoAstro 0.00
TiagoAstro
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Benjamin DeHaven:
Odd... looks overexposed to me. Almost like shutter is staying open too long or you have autoISO on. Can you confirm the metadata (recorded shutter speed and ISO) for the normal and the odd flats are the same? I don't use a dslr anymore nor have I ever used an ASIAIR so I'm reaching here. Hopefully with this additional information someone will come along and know the answer as to WHY this is happening...

***the iso was 100 and the exposure time 60ms.Thank you for your answers ***
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