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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 19 Aug 2010 (Thursday) 10:48
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Star trail advice needed

 
atexasphotog
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Aug 19, 2010 10:48 |  #1

Ist attempt at some star shots....was experimenting on different time lapse settings but was not satisfied with the results. Any help ar advice would be appreciated. Kinda blurry on the stars and (I know) lots of noise. It was a little windy and I thinking that was a contributing factor as well.
I am using a Canon Xti with a EF-S18-55mm f/3.5-5.6 IS lens

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Biffbradford
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Aug 19, 2010 10:50 |  #2

I think you just missed the focus. Keep trying and you'll find it.


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SkipD
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Aug 19, 2010 15:58 |  #3

Lock the lens into manual focus and carefully tweak for the sharpest image.

Use a STURDY tripod and head system. Flimsy ones won't allow you to get the images you want.

Use a remote shutter release instead of handling the camera's shutter release button.


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alt4852
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Aug 19, 2010 16:00 as a reply to  @ SkipD's post |  #4

hint: hyperfocal distance does not mean turning your focus ring all the way to the end of the turn. it's slightly before it.


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SkipD
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Aug 19, 2010 17:22 |  #5

alt4852 wrote in post #10752225 (external link)
hint: hyperfocal distance does not mean turning your focus ring all the way to the end of the turn. it's slightly before it.

Not only that, but all Canon autofocus lenses have the "infinity" position well before the mechanical stop that can be bumped with the manual focus adjustment. I believe the purpose of this is so that the autofocus mechanism won't slam against a stop when going for "infinity".

If the OP has been turning the focus ring to the hard stop, that's a good reason why the images are out of focus.


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ckckevin
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Aug 19, 2010 21:54 |  #6

change the color temperature to tungsten will help with the color. and don't turn your lens all the way. Because somehow the lens is designed so that someone can focus pass "infinity" (sounds weird to say it...)


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fiveFPS
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Aug 23, 2010 20:02 |  #7

atexasphotog... there might be 2 things that contribute to the result of your photos... maybe something in the tripod setup or floor is not sturdy.. sometimes cameras not screwed on tight to the plate will slowly unwind, or maybe the floor...is it on the concrete? or sand? or wood plank where if someone walks it may trigger motion blur.

Check your lens sag.. zoom it out then let it sit with lens facing directly up, which is against gravity and see if the gravity pulls down on the lens.. if it does it's changing your focal length... some heavier lenses do this and some have a stiff zoom so it stays in place.

last but not least... it just maybe the focus.. like others said.. turning it all the way to the infinity side does not mean it's in focus. Since stars are hard to focus on at night with the manual ring, I suggest you have someone stand at infinity distance + ... maybe 10ft away is far enough. Have him/her use a flash light or cell phone so you can spot focus with AF on then once it's locked, set AF to MF and that's your camera's infinity focus.

Have fun shooting and post more pics after... hope this helps


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hollis_f
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Aug 24, 2010 05:51 |  #8

fiveFPS wrote in post #10774985 (external link)
I suggest you have someone stand at infinity distance

I can think of several people I'd like to volunteer for this!

fiveFPS wrote in post #10774985 (external link)
maybe 10ft away is far enough

No, not for these people.


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joebob23
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Aug 24, 2010 15:27 |  #9

You mention having an IS lens. Make sure to turn the IS OFF before shooting long exposures on a tripod. If the IS senses absolutely no movement at all, sometimes it'll start to creep a little. Also, it'll kill your battery faster...




  
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argyle
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Aug 25, 2010 18:01 |  #10

atexasphotog wrote in post #10750307 (external link)
Ist attempt at some star shots....was experimenting on different time lapse settings but was not satisfied with the results. Any help ar advice would be appreciated. Kinda blurry on the stars and (I know) lots of noise. It was a little windy and I thinking that was a contributing factor as well...

Try this link...all the info you'll need: Shooting Star Trails and Static Stars (external link)


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Star trail advice needed
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