We've already seen some Comet NEOWISE photos:
Astrotracker advice linking focal length to time, Neowise Comet - PentaxForums.com
along with some questions about astrotracker usage and comet exposures.
I'll bet there are a lot of comet shots out there, just waiting to be seen.
I'll put out a few from last night, with some comments on exposure details, and hope for many more to follow.
I was set up with my K-1 and DA* 60-250mm F4 lens, on a non-too great tripod. I wasn't sure the sky would be clear (it's monsoon season here in Arizona, and we had 1.15 inches of rain yesterday!) but by 8 PM things were looking good.
I did not bother to set up the astrotracker, so these images all have some trailing.
Focus was in manual, and focusing was done in magnified Live View, on a star near the comet or even the comet itself - it's that bright! I used the 2-second mirror lock-up mode.
For most of my shots, I had the zoom at minimum (60 mm) so I could get a modest field of view to emphasize the comet tail. Even at 250 mm, though, the trailing was not bad for the 8 second exposure below.
I had the ISO cranked up substantially - 12800 to 25600 for most shots. One try at 51200 was pretty poor! But, otherwise, I was rather impressed with the quality of the images. At these ISOs, the sky background is well above zero - a typical histogram of the sky peaked at 40 or more in PhotoShop Elements.
These images are jpeg's from the camera, run through DxO PhotoLab to up the contrast a bit and do a bit of noise reduction.
Here's a shot at 60 mm focal length, ISO 16000, 15 second exposure, and f/4; the first image is the DxO version, the second is the sooc jpeg
Note the bonus (?) satellite trail! I have these in many of my shots. These are Starlink satellites - the ones being launched by Elon Musk by the hundreds (soon to be thousands). They will be the bane of astronomers!!!!!
Here a zoomed-in version: 250 mm / ISO 25600 / 8 seconds / f/4.0
A faint satellite trail in this one, too (left of the comet)
Note the greenish color at the front of the comet nucleus - I think that color is real: comets often have a greenish hue, thanks to the particular gases (Cyanogen in this case) that comprise the comet.
Back to 60 mm and ISO 12800 / 15 seconds / f/4
And, finally, similar to above, but a higher ISO: 20000
Thanks to the higher ISO, the background sky is somewhat brighter.
A bit of comet physics: the physical head of the comet is the nucleus - this is a ball of ice, rocks, and dust (the ice being of several kinds: some water ice, but also frozen carbon dioxide and ammonia (it's cold out there, baby - even colder than MossyRocks's Minnesota fingers!), typically a few kilometers in size; surrounding the nucelus is the coma - a cloud of gas that has evaporated from the nucleus and glows in the sunshine. The the wide, prominent curving tail seen in NEOWISE is a "dust" tail of material that has been emitted from the nucleus, and the long, thin, relatively straight blueish tail to the left in many NEOWISE images is the ion tail (gas that is ionized (lost an electron or 2) by solar radiation and subsequently glowing/fluorescing).