I would definitely either set focus to infinity or focus manually. Comets are too faint for autofocus. For other settings, just think like any other astrophotography: you want large aperture (low f/#) to gather light, moderate ISO, and the longest shutter speed you can manage before trailing becomes too strong.
and expose for the head?
I was reading about the Eclipse Comet, it was amazing that was one of two great comets in 1882 and its perihelion lined up perfectly for a total solar eclipse!
I mean, what were the chances?
https://en.wikipedia.org/wiki/Solar_ecl ... y_17,_1882
Eclipse Comet of 1882
A party of observers gathered in Egypt
to watch a solar eclipse in May 1882
were greatly surprised when they observed a bright streak near to the Sun once totality began. By a remarkable coincidence, the eclipse had coincided with the perihelion passage of a Kreutz comet. The comet would otherwise have gone unnoticed—its sighting during the eclipse was the only observation of it. Photographs of the eclipse revealed that the comet had moved noticeably during the 1m50s eclipse, as would be expected for a comet racing past the Sun at almost 500 km/s. The comet is sometimes referred to as Tewfik
, after Tewfik Pasha
, the Khedive of Egypt
at the time.[sup]
The Great Comet of 1882 was the brightest comet in recorded history and happened later that year.
Great Comet of 1882
Main article: Great Comet of 1882
Photograph of the Great Comet of 1882, as seen from South Africa
The Great Comet of 1882
was discovered independently by many observers, as it was already easily visible to the naked eye when it appeared in early September 1882, just a few days before perihelion, at which it reached an apparent magnitude estimated to have been −17, by far the brightest recorded for any comet and exceeding the brightness of the full moon by a factor of 57.[sup]
[/sup] It grew rapidly brighter and was eventually so bright it was visible in the daytime for two days (16–17 September), even through light cloud.[sup]
After its perihelion passage, the comet remained bright for several weeks. During October, its nucleus was seen to fragment into first two and then four pieces. Some observers also reported seeing diffuse patches of light several degrees away from the nucleus. The rate of separation of the fragments of the nucleus was such that they will return about a century apart, between 670 and 960 years after the break-up.[sup]
Nice to see an actual photograph of this Great Comet!