A mosaic of 2 pictures for IC 1396 in Cepheus. It was taken last Friday 10/20 on the Blue Ridge Parkway (NC), clear sky, good transparency, fair seeing because of wind, 36F.
Canon 20Da, ISO 1600. Takahashi E160 f/3.3. 2 x (16 x 3 min = 48 min) of exposition, frames calibrated, aligned and stacked with ImagePlus, enhanced with Photoshop.
Calibration with flat fields seems very sensitive. After stretching, the upper left part has a green-yellow cast (that I find again on other pictures), the lower part has a blue-purple cast. I need to rework on the picture, take other flats to see if I can improve the result.
Thanks for looking.
Canon 20Da, ISO 1600. Takahashi E160 f/3.3. 2 x (16 x 3 min = 48 min) of exposition, frames calibrated, aligned and stacked with ImagePlus, enhanced with Photoshop.
Calibration with flat fields seems very sensitive. After stretching, the upper left part has a green-yellow cast (that I find again on other pictures), the lower part has a blue-purple cast. I need to rework on the picture, take other flats to see if I can improve the result.
Thanks for looking.
Attached Image:
