Hi there. As Comet 2018 Y1 (Iwamoto) is approaching its largest brightness these days, I went out to photography the comet for my first time. I found that imaging a comet seems was difficult and challenging. For a super fast moving comet as C/2018 Y1, although this comet is much brighter than most deep-sky objects, signal-to-noise ratio is hard to be improved. I have the following issues:
- Single-image exposure time is limited. This comet is moving extremely fast. Exposure longer than 1 min will result in a trail of its movement.
- Stacking and centering comet doesn't help to improve the S/N of the background. It only improves the S/N of the comet.
- Stacking and centering on stars helps improve the S/N of the background, but it leads to a trail of the comet (unwanted).
- The tail of the comet is hard to recover. The tail has a much less brightness. With the poor S/N of the background, it can hardly be recovered and distinguished.
Any tips that help to improve the quality of the comet images?
Equipment I used:
Canon 5DS R DSLR body,
Canon EF 100-400mm IS II lens,
iOptron SkyGuider Pro mount,
Here are some photos I managed to photograph.
12 x 65 sec. total exposure, ISO 6400, f5.6, 400mm, centered on comet.
12 x 65 sec. total exposure, ISO 6400, f5.6, 400mm, gif animation.
Edited by jackyjsy, 11 February 2019 - 02:31 PM.