Set Canon

September 9th, 2005

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How do you focus on stars?

I am planning to photograph a field of stars with no foreground subject. I have very poor night vision, so I will not be relying on my own ability to focus manually.

My setup will be (and these cannot be changed):
-shoot wide open at f/2.8
-shoot at widest 16mm setting (Canon 16-35mm)
-high ISO to eliminate star trails
-long exposure, but not enough to make star trails

My DOF calculator says a 16mm lens at f/2.8 has a hyperfocal distance of ~10 feet (everything from 5 feet to infinity is in focus). Now, recalling that I have no foreground subject (or if anything, some hills in the far distance), what would you do and why?

1) Focus on infinity
2) Focus a notch under infinity
3) Focus on the hyperfocal setting of 10 feet
4) somewhere between 2 and 3

It sounds like it would be hard to make a focusing error here, but I would like maximize lens sharpness.

thanks in advance

You want to focus on infinity, but the marks on your lens aren't always correct. To find out what is truly infinity do this. During the day, focus on something way off in the distance, like the horizon. Look to see if the lens is lined up at the infinity mark. If so, great, that's what you'll set the lens at. If not, mark where it's aligned with a piece of tape or something and focus there for the picture. The focus on some lenses shift with temperature so this isn't foolproof, but should get you very very close.

The other option is just focus on something very bright that is very far when you are going to take the picture. If the moon is up there's your target. Good luck! There's something especially enjoyable about photographing the sky at night!

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