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Anonymous 07/21/14(Mon)03:43 UTC+1 No.2368038 Report

Anyone have any tips or general direction how to do star trails in a single shot? I know its gonna be 80+ minute bulb shot at a 2.8 but other then that im pretty lost. any help or tips would be appreciated. also general long exposure thread.
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Anonymous 07/21/14(Mon)03:45 UTC+1 No.2368041 Report

>>2368038
What else do you need? Get a tripod and a remote...
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Cupid 07/21/14(Mon)04:07 UTC+1 No.2368052 Report

>know its gonna be 80+ minute bulb shot at a 2.8
>single shot

Wut? I think you are mixing up astro with star trails. This is what I would do:

1. You don't need to shoot wide open as you don't need to worry about the shutter speed to prevent the stars blurring.

2. 80+ mins will heat your sensor up to the point you can cook eggs and bacon on it and introduce unnecessary noise.

Use the best aperture with relevance to your lens's sweet spot and do multiple long exposures with an intervalometer, then blend using something like a lighten blending mode (there might be a better mode, google is your friend) in the shop for the sky layers with a separate tidy base shot for the ground and mask it off.
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Anonymous 07/21/14(Mon)04:11 UTC+1 No.2368055 Report

>>2368038
If you want to do 80+ minute single exposures, you're probably best using a fully manual film SLR and some Ektar or Provia. Extremely long exposures don't work well on DSLRs due to a combination of thermal noise and light pollution overwhelming the sensor. You'll end up with a blown-out sky and probably run out of batteries. I've seen star trails done with single exposures on digital but I still think it's easiest to get some 70s-era SLR and a cable release and just leave the shutter open as long as you want.
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Anonymous 07/21/14(Mon)07:54 UTC+1 No.2368151 Report

>>2368055

If you're using digital then stack the exposures. You get trails, you manage light pollution, and you minimize sensor noise.
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Hafenmeister 07/21/14(Mon)09:31 UTC+1 No.2368188 Report

>>2368052
This tripfriend speaks wisdom.

If you want to do a single shot startrail photo, use something analog that works entirely mechanical. Your best bet is a medium format camera.
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Anonymous 07/21/14(Mon)21:10 UTC+1 No.2368575 Report

>>2368038
don't bother doing it in a single shot, there's a lot less that can go wrong in several 30-60 second shots, and you won't overexpose the foreground. also make sure you know how to focus stars if your lens zooms past infinity (either auto-focus on a bright light far away then switch it off, or zoom in on live view & adjust)
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