Quote:
Originally Posted by Rocket Boy
Josh are you using a cable release and mirror lockup?
If not then camera shake may contribute to your star trails.
Also my advice is to stick with "in cam n/r" with your short exposures until you're ready to start tracking, then think about Darks/Flats.
If you take a 25 sec shot then it will need another 25 sec for the in cam N/R.
There's a limit to how short an exposure you can go to avoid trails no matter how many lights you take, for example 5 sec @ ISO 1600.
The sensor just doesn't have enough time to record enough signal to overcome sensor noise.
So there's many factors that come into play, but without tracking you're limited and at the mercy of these factors.
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i've a cable release, and use mirror lock up, and even leave a bit of time between mirror lock up and opening the shutter, and i'm pretty careful to not even breathe in teh direction of the camera during exposure (slight exageration). so it's most definitely star trails that i'm recording
Quote:
Originally Posted by [1ponders]
Or even try your timer so you are well away from
the camera when it goes off.
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i used to do that with the powershot S3IS
i think it'll come down to actually getting out there and experimenting.