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Old 13-11-2009, 05:04 PM
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Memory cards

I am having a few issues with CF memory cards and my 350D. If I take a 5 min exposure it takes about 2 1/2 mins before it finishes writing to the card and I can image again, is this normal? The card I am using is a SanDisk Ultra II at 15MB/s and the images,in RAW, are 10 - 11 meg long.

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Old 13-11-2009, 05:20 PM
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supernova1965 (Warren)
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that sounds odd you could backup your photo's and have your camera format the card that may fix the problem
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Old 13-11-2009, 05:48 PM
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Do you have in-camera noise-reduction on or off?
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Old 13-11-2009, 06:04 PM
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Quote:
Originally Posted by supernova1965 View Post
that sounds odd you could backup your photo's and have your camera format the card that may fix the problem
I always format the card after every session, after backing everything up of course, so I always start with fresh card. I bought this new in September and I think it's been formatted about 6-7 times.

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Old 13-11-2009, 06:18 PM
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Quote:
Originally Posted by troypiggo View Post
Do you have in-camera noise-reduction on or off?
Noise reduction was on I have now turned it off. I didn't realise it was even on. I assume it makes a difference because it processes the files first before it sends to the card? Excuse my ignorance.

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Old 13-11-2009, 06:33 PM
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It should actually take a dark of the same exposure time, then process the image with the dark and then write the resulting file to disk. That's what I understand, anyway.
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Old 13-11-2009, 06:59 PM
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With ICNR on, your camera is effectively taking darks in-camera. That's what's taking all that extra time. With ICNR off, it just takes the light image and downloads it. Much quicker.

It's up to you to use ICNR on or off, but if you choose off you'll have to take darks manually.
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Old 14-11-2009, 01:35 PM
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I didn't even know the 350D (I have one) had in camera noise reduction. Where is it in the menus to turn it on or off? Cheers

How effective is using in camera noise reduction as opposed to taking darks
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Old 14-11-2009, 03:16 PM
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Pretty sure it's a custom function on the 350D. Have a look through those.

As for ICNR vs darks, I believe the result is the same - if you take the same number of darks as lights. I've adopted the theory that I'd rather take many more lights, and might take 10-20 darks only and make a master of those. Saves time. Plus you can take darks after you've taken your camera off scope as long as temperature etc similar, whereas ICNR is taken after every shot. Think that makes sense...
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