Canon Eos 30d 10mm 1293s F/4 ISO400 +0.0ev 2007-12-18 02:34:05
18 Dec 07
A post work trip out to Connemara resulted in this 20 minutes exposure. Of course including the other 20 minutes while the Noise Reduction runs means that it was actually the result of a 45 Minute wait. The wind was quite strong, but I think this is a successful go.
Update: I forgot to mention that I was lucky enough to observe some meteors looking in the other direction. While the bulk of the shower was over, I was still able to catch some of the Geminids.
Update: I forgot to mention that I was lucky enough to observe some meteors looking in the other direction. While the bulk of the shower was over, I was still able to catch some of the Geminids.
Excellent, and well worth the night trip out to Connemara......
Beautiful shot, definitely a success. This is something I've been meaning to try but haven't gotten around to yet! I'm curious, if you had shot at the lowest ISO, would you still recommend running the Noise Reduction?
Thanks lad,
Latchiko, the noise reduction gets rid of hot pixels, rather than reducing ISO grain. Unless you like cloning out hundreds of mad colours in post, you need to leave the noise reduction on. ISO400 is the recommended ISO to get enough light too. Even at this I've pushed the Exposure in Lightroom by over a stop. I may repost the image because there's more noise in the water than my full size original.
That's very interesting. I had never differentiated between ISO grain and hot pixels, but of course it makes sense that they are not related. And I would never have thought of needing ISO400 for star trails either, assuming that the lower the ISO the better. Thanks for the info, you saved a few hours freezing my butt off learning the hard way!
There is another way to do it, but it's card and disk space intensive. Use an intervalometer to run the camera and shoot loads of 15" sec exposures. It may also work if you set the camera to high speed drive and used a remote shutter in the lock position. Stack the images in Photoshop to create the star trail. This way if you need you change the battery if it needs it. also you can stack whatever interval to create different looks.
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