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clayk
4th of July 2004 (Sun), 15:24
I am not close to where my manual is, but I need to know how to lock my 1D or MK2 shutter open for several hours without having to hold down the shutter open. Can someone offer some help? Thanks.
robertwgross
4th of July 2004 (Sun), 16:09
I am not close to where my manual is, but I need to know how to lock my 1D or MK2 shutter open for several hours without having to hold down the shutter open. Can someone offer some help? Thanks.

Simple. Use the remote shutter release cord. The button can be locked in place.

---Bob Gross---
nemesis099
4th of July 2004 (Sun), 20:42
Out of curiosity what reason would you need to keep the shutter open for hours?
robertwgross
4th of July 2004 (Sun), 21:26
Astrophotography comes to mind.

Cave photography comes to mind.

There are probably some others.

---Bob Gross---
clayk
4th of July 2004 (Sun), 21:26
I want to shoot some star trails over several hours. Always wanted to try it
Guillermo Freige
4th of July 2004 (Sun), 21:31
I want to shoot some star trails over several hours. Always wanted to try it
Not a good idea, I think. Noise will be quite high. A serie of shorter shots and stacking software probably will generate better results.
clayk
4th of July 2004 (Sun), 21:33
You very well may be right, but I want to try it and see what it does. I don't think I could get the same effect with stacking
Jesper
5th of July 2004 (Mon), 01:49
You very well may be right, but I want to try it and see what it does. I don't think I could get the same effect with stacking

Have you ever tried stacking? How do you know you can't get the same effect? Have a look at Max Lyons' star trails gallery (http://www.tawbaware.com/maxlyons/cgi-bin/image.pl?gallery=8) and his ImageStacker (http://www.tawbaware.com/imgstack.htm) software.
nosquare2003
5th of July 2004 (Mon), 04:26
Will you use external power source for several hours exposure?
bertelm
5th of July 2004 (Mon), 08:50
With a remote, the longest exposure I have taken was 30 minutes - I wanted to catch the stars streaking across the sky. The noise wasn't too bad, but I did have to clean it up with neat image.

One issue you might run into is with power. Long exposures do drain the battery. You probably can do 1 hour with the regular battery - more than that, you might need an external battery.
clayk
5th of July 2004 (Mon), 10:02
Stacker looks very interesting. The only thing I don't like is the "choppy" appearance of the trails. However, I will definately try it. Thanks for the tip.
timmyquest
5th of July 2004 (Mon), 10:04
With a remote, the longest exposure I have taken was 30 minutes - I wanted to catch the stars streaking across the sky. The noise wasn't too bad, but I did have to clean it up with neat image.

One issue you might run into is with power. Long exposures do drain the battery. You probably can do 1 hour with the regular battery - more than that, you might need an external battery.

For those of us who didnt read the manual front to back 8)

The book says your good for a 3 hour expos. before the battery dies.