How to achieve proper focus of stars at night?

haring

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I would like to take some photos of stars at night. I have found the location. No problem. I have to keep an eye on the alligators while I am doing this because the location is in the Everglades. No problem.
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The only problem I am facing is that I have hard time focusing at the stars because the viewfinder is black. (It is 1:00am at night after all.... )
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I manually focus at infinity and the stars are out of focus.

I have tried to use the screen in video mode after increasing ISO. No luck. Even the screen on the back of the camera is dark so I am not be able to see the stars for proper focusing.

My question: How do you focus in total darkness? Did I miss something?
 
Camera or lens is not in proper repair.

How does subject a half mile away look in daylight?

If you are using a lens wide open, they generally are not sharp there.
 
I manually focus at infinity and the stars are out of focus.

Set it to infinity. Manually, by wire, but stars are on infinity.

If results aren't sharp - rig isn't stable enough while you are dealing with gators or exposure is too long. Or something is wrong with the lens, as it was mentioned above.

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Focal Length 17mm
Exposure 28s
F Number f/4.5
ISO 400
 
Some camera manufacturers allow their lenses to focus past infinity. Be it due to manufacturing tolerances, IR imaging, etc.

I would recommend focusing on somehthint bright like the moon, making sure it's sharp, and (depending on your camera / lens combo) lock focus or tape down the focus ring to keep it from moving.
 
Ok a dumb question but what camera are you using? I'm really surprised that you can't see the stars on the LCD. I assume you can zoom in live view? When I shot some stars with a D700 I couldn't see anything until I zoomed in and then it was super-easy even at low ISO. I found that the Nikkor 50mm (like many lenses) can focus past infinity, but bringing it back a touch sharpened things up (AF was useless of course)

HTH,
Scott
 
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