This past weekend I tried my hand at shooting the comet Lovejoy. I had lovely clear skies Friday evening and caught my first glimpse of the comet. It’s a cool fuzzy green blob below the Pleiades. I trained my long 300-800mm lens on it, but it was hard to get much with the lens. It’s slow at f5.6, not ideal for astrophotography. Combining that with the long length meant I couldn’t use shutter speeds much fast than 2-3 seconds before the stars lost their pin point brilliance. My Canon 5D MarkII has good ISO quality up to 3200. 6400 was ok, but the HI and H2 were too noisy to use. I also forgot to pre focus the lens to infinity during daylight hours, so the first batch of shots weren’t great.
I pulled out my 70-200 f 2.8 lens and had much better luck. The infinity mark on this lens was spot on and the 2.8 aperture combined with less focal length allowed me to get longer shutter speeds and some decent images. So I’ve got a cool fuzzy green blob on a field of stars. I’ll take it!
Key points to remember prior to shooting objects at night with basic camera photo gear:
- Prefocus all lenses to infinity and tape the focus ring down
- Turn off autofocus
- Have a red light headlamp
- Shoot in manual
- Use the widest aperture you have – a 2.8 or wider lens is best
- Start with ISO 3200 and go from there
- Take the lens focal length and divide into 500 for the longest shutter speed you can use without significant star streaks, ie 200mm into 500 is 2.5 seconds, 20mm into 500 is 25 seconds, 100mm into 500 is 5 seconds, etc…
- Don’t even try this without a tripod
- Use your cable release or remote control
- Consider long exposure noise reduction, but this does double the time to take each image
- Mirror lock up not really necessary as the shutter speeds are too long. Mirror lock up is best for speeds between 1/15 and 1 second long
- Figure out ahead of time where your object is located in the night sky and have a star chart or app available to help you find it.
- Find a dark sky location away from light pollution
One day I’d love to have a telescope to shoot through and the ability to track the earth’s rotation. Something to look forward to. In the meantime I’ll drool over the spectacular shots other astrophotographers got. See this link for some examples:
Here’s my shot: