This patch of nebulosity lies in the western part of the constellation of Cepheus. The conditions on that evening were very clear and cold with no moonlight, stars were visible down to magnitude 5.
I was using my 10 inch f/4.8 reflector, a Vixen Atlux mount, PHD auto guiding, an Atik 383L mono CCD camera and a set of Astronomik filters. The filters were H Alpha for red, O111 for green and a blue filter.
I captured five minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final image.
The total exposure time was 90 minutes using a blue filter, 30 minutes using an O111 filter and 120 minutes using a H Alpha filter.
The Iris nebula
This image contains data from two telescopes , an 80mm f/6.3 refractor and a ten inch f/4.8 reflector. NGC 7023, vdb141
