Around June 20th, Jupiter started its retrograde motion in the Aquarius constellation so I decided to impress it in a photo through a mosaic composition!
I took pictures from the beginning of May to the middle of July every 3-5 days around 3:30A.M., for one hour more or less each day considered also the setup accomodation. 
Sometime the bad weather did not allow me to shoot to Jupiter; however I collected at the end 14 positions! I removed two positions very near to the June 22nd around the point of trajectory inversion (June 19th and June 25th) where there was too overlapping (according my camera-lens resolution) and also other two positions not very clear for the weather condition at those days;  so I collected originally 18 positions but only 14 have been composed in the final full mosaic.

Due to the early morning time I decide to have a fast and simple setup and I realized a self-made 162mm focal length camera-lens by using the 50mm diameter-lens of the 9x50 finderscope (162mm focal-length) and with spacer rings self-made in order to achieve focus of my Canon EOS 550D main camera. 
The finderscope lens has not a proper correct field for astrophotography, however in post-processing I cropped for each panel of the mosaic (each one panel for each day being a stacked *.tiff file obtaned from 15 light frames and 25 dark frames) the non-corrected part of the photo in order to build then the full mosaic.

I report here all the details of the mosaic for the Jupiter retrograde motion - 2021:
- location: Certosa di Pavia, Italy
- main camera: Canon EOS 550D
- lens: 162mm self-adapted 9x50 finderscope lens with self-made spacer rings
- mount: Celestron AVX
- mosaic details: 14 panels (one panel for each Jupiter position in the mosaic) each one being average of 15 light frames of 10sec @800ISO and 25 dark-frames
- post processing program: Deep Sky Stacker (for each position, 15 light frames, 25 dark frames), Photoshop CS6
- dates: May 6th, 9th, 14th, 18th, 20th, 25th. June 1st, 4th, 9th, 12th, 14th, 19th, 22nd, 25th, 30th. July 5th, 8th, 12th.

Finally, before starting this project, I simulated in Excel all the Jupiter positions in the reference period in order to have an idea of the field and the magnificence coherence.

I hope you like this attempt I realized with a self-made lens!