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DPChallenge Forums >> Photography Discussion >> Night Photography/Canon 20D owners
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Showing posts 1 - 9 of 9, (reverse)
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10/29/2007 01:28:39 PM · #1
I've been doing a little shooting lately at night with exposures between 30 seconds up to a full minute and I've noticed that it takes about 15-20 sec to read to the card in between shooting. Is this normal? I'm shooting in jpeg and using a SanDisc CF card.
10/29/2007 01:30:14 PM · #2
It's not reading the card probalby. It's probably doing the internal noise reduction, which should take exactly as long as the exposure. It's in the custom functions and you can turn it on and off, but I recommend leaving it on if possible.
10/29/2007 01:30:25 PM · #3
do you have noise reduction enabled?

arg too late...

Message edited by author 2007-10-29 13:30:59.
10/29/2007 01:52:36 PM · #4
DOH.....Why didn't I think of that? I just checked at it is on. I had no idea. Thank you so much.

10/29/2007 01:59:59 PM · #5
darn a question I actually knew about and I was late :)

The custom feature was turned on in my camera when I got it. So I just thought it took along time to process. I ended up bringing it back to the place I bought it and they showed me teh custom functions and told me how to work it....

10/29/2007 02:06:26 PM · #6
I did an hour long exposure with my Rebel XT once, and it ran for an hour after I closed the shutter and brought the camera back indoors. LOL.
10/29/2007 02:16:16 PM · #7
the long exposure nr on my nikon will last about as long as the actual exposure however a few times I have done 30+ minute exposures and it only took about 15 minutes for the NR.
10/29/2007 02:38:28 PM · #8
Wow, must not have Intel Inside...
LOL
10/30/2007 01:05:16 AM · #9
Originally posted by Bugzeye:

the long exposure nr on my nikon will last about as long as the actual exposure however a few times I have done 30+ minute exposures and it only took about 15 minutes for the NR.


That is not possible, your camera must be not working correctly.
Lets say that you take a picture for 5 seconds. The camera will close the shutter when the picture is taken and record the same amount of time (5 sec in this case) with NO LIGHT at all and use the image to see any Hot or dead pixels. It will then FIX the dead or hot pixels in the image making a MUCH cleaner image. The only downside is that the shot we just took of 5 seconds took 5 more seconds to process. Not bad but when you leave the shutter open for 20 minutes and then have to wait 20 minutes before you can do anything with your camera....well, the image quality is still worth it...BUT FRUSTRATING!
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