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PostPosted: Tue Dec 01, 2009 9:13 am 
When I take a long exposure shot of say 30 seconds, it takes about another 30 seconds before I can see the result. Is this normal or is my memory card too slow? When I take an 8 second shot the result is there within 1 second but a 10 second shot takes about another 10 seconds before you can see the result and a 1 minute shot seems to take about another 30 seconds to 1 minute to produce the goods. (haven't actually timed it)

My card is a Sandisk Ultra II 4GB SDHC 15MB/s which I know isn't the fastest card but neither is it the slowest, just wondered if it is the camera taking the time to process the photo or the simply the card being slow?

I also have as a spare, a Kingston Elite Pro 2GB with a speed of 50x which I have no idea what 50x speed actually means in terms of MB/s but it appears to be not noticably different to the Sandisk in terms of speed


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PostPosted: Tue Dec 01, 2009 11:38 am 
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You have long exposure noise reduction turned on (also known as dark frame subtraction).

It basically takes another exposure, and then removes the noise. It's very useful, but, it takes some time to do the other exposure ;)

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PostPosted: Tue Dec 01, 2009 12:15 pm 
Aha :D thanks. I might try some with it turned off just to see if it's worth having on or if there's not much noise anyway


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PostPosted: Tue Dec 01, 2009 6:18 pm 
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You're welcome shire ;)
I'd turn it off for test shots, and turn it on for the real shot though :)

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PostPosted: Tue Dec 01, 2009 6:29 pm 
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If you are doing a lot of long exposure with exactly the same settings, you may find it worthwhile to manually take a dark frame and subtract it from the shots. Basically take a shot with the lens cap in place, so this will only capture the long duration noise. Then use whatever software you have to subtract it from the images. Of course, you're trading photographing time saving with additional manual processing time.

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PostPosted: Thu Dec 03, 2009 10:07 am 
That's getting a bit technical for me now :D


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PostPosted: Tue Dec 29, 2009 8:07 am 
hello i think your camera is taking time because of your card. i think your card is not so slow but it got damaged or may be it get any infections or virus thats why your card is running slowly.



thanks


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PostPosted: Wed Dec 30, 2009 4:00 pm 
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Hello gragory, and welcome to the friendly Camera Labs forum!
To enjoy your stay here please have a look at the house-rules!
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If I had to guess I'd put my bets on the dark-frame subtraction-thingy - as long as normal daylight shooting behaves inconspicuous.

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