I started a project on 2014, a 4 tiles mosaic of the Horse Head Nebula. The first image was taken on November 2014 and the last on March 2016. In between a completed 10 different images with the same setup.
The image of the horse head nebula is composed of +90h of integration taken in 3 different years 2014, 2015 and 2016.
The rest of the images are quick 2h integrations.
– Telescope: Takahashi FS60 @ F/4.2
– Camera: SBIG STF-8300
– Mount: Atlas
– Guided with SX OAG and QHY5L-II
– Filter: Astrodon 36mm 5nm Ha
– Mosaic of 4 tiles
– Captured with SGP
– Processed with Pixinsight
More details here: https://mtanous.wordpress.com/horse-head-wide-angle/