||M27, RA 00:42.7 Dec 41:16
||30 minutes (10 X 3 minutes) for each
frame of the mosaic
||Canon 60Da DSLR
|| 200mm SkyWatcher f/5 Newtonian reflector with
Paracorr for a total focal length of 1150 mm
||St.Croix Observatory, St. Croix, N.S.
||Calibration and stacking Images
. Images aligned in Registar and an arcsinh stretch was
applied in Images Plus to brighten the image enough so that
the spiral arms were visible. The mosaic was built in Images Plus using
layers and curves to match brightness at the edges and blurred masks to
blend things together. Stars split from the image and multi-scale
decomposition used on the galaxy image to increase the contrast and
detail. The detail layer from the decomposition was blended
with the original using the merge split blend mode. Multipoint flatten
was used to flatten the image and remove a small gradient. Since the
image is a little low on exposure, two passes of masked noise reduction
were applied concentrating on different frequency bands in each pass.
Finally the stars were recombined with the galaxy and the resulting
image binned by two.