C/2001 A2 LINEAR
Here is the comet of the summer of 2001.It was visible to the naked eye in the first half of July. It has been a really interesting comet because it broke into 2 parts. Its coma was very diffuse at the beginning but a bright nucleus appeared around the 12 of July when the comet broke. During the next nights, it was possible to see the 2 nucleus as is visible on the image of the 21st of July. Its tail was visible through the telescope with a length of about 1 degree, but in reality it was much longer (see the picture taken with the 135mm lens). The tail was even double.

Photo taken on July the 2nd. T200 f/4.6 at prime focus. 25 minutes exposure on Elite Chrome 200 taken on the slopes of Mont Ventoux at 1300m of altitude (France).
For this photo, I took advantage of the 30 minutes between moonset and dawn. At this time, the comet was visible to the naked eye. Through the telescope, it was a bright ball, slightly oval. The tail was very difficult to see.
Guiding on the nucleus wasn't easy because it was very diffuse.

July the 21st, the breaking of the nucleus is easily visible. On this photo, the 2 parts of the nucleus are separated by 25 arcseconds. T200 f/4.6 at prime focus. 40 minutes exposure on Elite Chrome 200.

This wide field shot shows the length of the tails. It is 5 degres long. 135mm lens at f/4, 35 minutes on Elite Chrome 200. Guiding was done on the comet nucleus. 

This is an enlargement of the image above showing only the blue channel to reveal the tail.

A last picture taken on July the 12th. 400mm f/5.6 lens 40 minutes exposure on Elite Chrome 200. The shot was taken at a very good site in the French Alps at 2400m altitude but the Moon was rising by the end of the exposure.