Panstarrs – 40 x 4 sec @ ISO 1600, 400mm F/5.6 

The above image was generated with data from 40 sub-images, calibrated and stacked in IRIS.  It shows the extent of the tail better with more time.  Once the comet is out of the twilight, the true tail length will hopefully be visible.

This is the same data as the first picture but close-cropped and the background color gradients neutralized.   I was hoping it would show maybe a smidgen more tail than the first image in this version.

One more image follows:

Here is a composite of a 10 second exposure at ISO 1600 and 40×4 sec ISO 1600 exposures stacked in IRIS.  The lens is a 200mm F/2.8 with a 2x teleconverter (400mm, F/5.6.)   It looks more natural with the trees visible at the bottom than the first image, in my opinion.