Flat frame contains star trails
Posted: Tue Mar 20, 2018 8:56 pm
I used the Capture Flat feature for the first time, in version 3.1.5092.0, with an ASI1600MC-Cool camera. I'm using a Win 10 64-bit laptop.
I typically take twilight flats, since they are convenient for me. When I've taken flat frames for processing in DSS, I first turn off tracking for my mount, so that any stars visible in the frame will move from one frame to the next, and thus be calibrated out. I typically take flats this way using 1-sec exposures, and DSS always calibrates out any stars.
To create and use a flat in SharpCap, first I turned off tracking to my mount as I typically have done. I then used the Capture Flat feature and adjusted exposure time until SharpCap said the Histogram was OK. I think I ended up with 4-second exposures. SharpCap then created a flat frame, but the flat had star trails in it.
Here is a link to the flat frame fits file: https://www.dropbox.com/s/sfqp6vcedx9wg ... .fits?dl=0
Did I do something wrong or is this a bug? Thanks.
-Robin
I typically take twilight flats, since they are convenient for me. When I've taken flat frames for processing in DSS, I first turn off tracking for my mount, so that any stars visible in the frame will move from one frame to the next, and thus be calibrated out. I typically take flats this way using 1-sec exposures, and DSS always calibrates out any stars.
To create and use a flat in SharpCap, first I turned off tracking to my mount as I typically have done. I then used the Capture Flat feature and adjusted exposure time until SharpCap said the Histogram was OK. I think I ended up with 4-second exposures. SharpCap then created a flat frame, but the flat had star trails in it.
Here is a link to the flat frame fits file: https://www.dropbox.com/s/sfqp6vcedx9wg ... .fits?dl=0
Did I do something wrong or is this a bug? Thanks.
-Robin