Rosette Nebula

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.

Rosette Nebula, Nikon D750a, Optolong l-enhance Filter, Astro-Physics 127mm f/8 with 0.7x Reducer, 61x120s, ISO400, Blur Exterminator, Noise Exterminator
Read More

NGC 4565

Move your mouse over the image to see annotations for some galaxies.

A larger version of this image which has been annotated with AVM headers can be opened in Microsoft WWT:ngc4565_150mm.jpg

150mm f/5 Newtonian, Baader MPCC Coma Corrector
Nikon D200
4x300s, ISO 800
18th, April 2009
Preprocessing (Dark, Flat & Bias correction), Alignment & stacking in IRIS, histogram adjustment curves, color correction in Photoshop.