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Star trail

By KeehnView
My first try at star trails, this is a total of 14 images. F4.5 @ 1600iso using bulb, 10-20 sec a shot.
Pulled them together in photoshop, changed to screen mode and adjusted the levels to reduce the noise.
Next clear night I will triple the number of exposures to increase the trail length.
If there is somethiing I could do different with the camera setting I am open for any suggestions.



Tags: Specialist and abstract Star trails Star trail

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banehawi Plus
17 2.5k 4268 Canada
3 Aug 2011 10:55PM
Its a decent first effort.

Heres a link to a good site to read up on the technique:

From what I see, youve done a lot right, however your ISO should be the lowest available, 100 on a 40D.

I have never tried to take this type of shot, so you may have another member jump in with some hints, and in the interim, the link seems very useful.


GManShorty 10 2 2 United Kingdom
4 Aug 2011 11:22AM
One technique to remove noise I have heard about is to leave the lens cap on and take a blank shot.
????????WHAT????????????? I here you ask. Grin
This blank shot will still record some information: noise. Its not just the visible spectrum wavelengths that can enter your camera, trigger your sensor and record a spec of illumination. Other wavelengths can do this too, and can enter the camera even with the cap on. So what can you do with this blank noise image? Subtract it from your cap-off images to remove noise using the Image>Arithmetic tool.

This tip came from BBC Sky At Night Magazine some time ago. I've tried it once whilst trying to photograph Orion, and I guess it worked quite well.
Tooth 16 5.8k 227 Ireland
4 Aug 2011 12:24PM
Was the tripod sturdy during the exposures? I ask because there seems to be some "camera shake" in a horizontal direction rather than the obvious movement of the trails This would be critical to avoid moving the camera especially if taking different shots. Are you using a remote release (wired or infra-red)?

Yes, use the lowest ISO possible a) to reduce noise, and b) to allow longer time for the same exposure, which is what you're looking for anyway.

The holy grail ith thesekind of shots is to include some static ground-based interest to give context - a tree or building etc. Note however I say interest - it has to be aesthetically pleasing in its own right and not just there for the sake of it.

It'll be a learning curve for you, but you've made a good start

KeehnView 14 12
6 Aug 2011 4:34PM
Thank you all for your comments and suggestions, the next clear night I will pull them together and try again.....

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