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Showing posts 1 - 7 of 7 |
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Bene07
46 posts
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Message posted at 07/04/2008, 02:18:10 AM by Bene07 |
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I apologise to everyone for what you are about to see ! Actually I cant upload it but it had thousands of little blue, red, green dots covering the whole picture, like someone had flicked red, blue and green paint on it, really yucky!
I was trying to experiment with the Bulb setting on my 20D. You know the usual stuff, star trails etc.
I left the shutter open for a long time ( although my battery ran out, I am not normally such a dope)
ISO 100
Aperture: 22
Cable release
Can any kind and patient person give me some tips or advice. Please don't tell me that it is shite, cause I already know that.
Cheers Bene
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Canon 20D
18-55mm
75-300mm
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Uploaded files: 119 | Total Sales: 324
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Milanlj
180 posts
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Message posted at 07/04/2008, 03:50:17 AM by Milanlj |
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when you expose your sensor for too long, it heats and some of the pixels dont work as they should. Usually known as hot pixels. It is nothing to worry about, but you should be careful beacuse frequent long time exposure (measured in minutes) can damege your sensor. Try to correct those pixels in photoshop... |
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Canon EOS 400D
Pentax K10D
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Uploaded files: 327 | Total Sales: 529
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Bene07
46 posts
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Message posted at 07/04/2008, 11:14:10 AM by Bene07 |
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When I said a lot of pixels, I meant a lot. Far too many to correct in PS. How does one avoid the sensor damage if they wat to take this sort of shot ?
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Canon 20D
18-55mm
75-300mm
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Uploaded files: 119 | Total Sales: 324
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Alexeys
30 posts
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Message posted at 07/08/2008, 16:45:56 PM by Alexeys |
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Canon 5D, Canon Rebel Xti
Lenses: Canon L 24-105mm, Sigma 1...
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Uploaded files: 886 | Total Sales: 1544
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Saorsa
316 posts
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Message posted at 07/08/2008, 19:29:55 PM by Saorsa |
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Digital is really bad for noise on long exposures. Remember, there are millions of sensors on there and they aren't all exactly equal. On a short exposure, they average out and are not noticable but, even a .1% difference in sensitivity would lead to different values after a long period. |
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Nikon D300, Nikon D50, Nikkors 18-55mm, 24-85mm, 70-300mm VR...
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Uploaded files: 466 | Total Sales: 580
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Rajhans
188 posts
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Message edited at 07/15/2008, 11:23:45 AM by Rajhans |
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Traditional manual focus film camera is best for bulb exposures. As you can keep these camera’s shutter open as long as you want. Some manual camera comes with Time exposure. It means you have to press shutter release to start exposure and press shutter button again when ever you want to close shutters... They never drain the battery. Also use cable release or in built self time to avoid camera shake and firm tripod. Again you have no need of f/22 aperture. You ill get perfect depth with f/4 or f/4.5.
Regards,
RAJHANS |
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Leica M-7, M-6, Lenses- Leica 28mm f/1.4, 35mm f/1.4, 50mm f...
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Uploaded files: 39 | Total Sales: 65
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Talanis
32 posts
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Message posted at 07/19/2008, 07:08:43 AM by Talanis |
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If you want good tips on star trails, you can check this article. |
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Canon Digital Rebel XSi
Canon 50 mm f/1.8
Canon 18-55 mm
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Uploaded files: 369 | Total Sales: 197
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