I chose the Rosette nebula again as my target of choice when I wanted to test if I can improve on the image quality when using the 0,7x reducer.
The Rosette nebula is a large and relatively bright emission nebula in the constellation Monoceros. Various parts of the nebula have separate NGC numbers and the embedded star cluster itself is NGC2244
This wider view was taken with the Takahashi FS-60CB and shows the surrounding area of the sky.
Later I discovered that the reducer only provides a 10% reduction in focal length, while introducing quite a bit of vignetting.
The Rosette nebula (NGC2237-9) surrounds the open cluster NGC2244 in Monoceros. According to Burnham´s Celestial Handbook it is located at a distance of about 2600 lightyears and has a diameter of about 55 lightyears. Read More →