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-   -   Memory Card Calculations (https://forums.steves-digicams.com/memory-cards-microdrives-card-readers/1697-memory-card-calculations.html)

Louise Parrish Aug 6, 2002 5:30 PM

Memory Card Calculations
 
Hi

Can someone explain this to me. My Memory Card has 128 mb. which gives me 52 pics at 2560X1920 (1.6mb per file) which totals 83.2mb - how is the rest of the memory allocated. Thanks.

Louise Parrish

NHL Aug 6, 2002 9:32 PM

Louise Parrish

Is this 52 the camera estimate, or your actual # of pictures taken for a 128Mb card?

The actual file size varies for each picture depending on the compression, and details. The camera usually estimate for the worst case (ie. biggest file ~ 2.5Mb), but if on average your shots are only 1.6Mb then you should be able to exceed the 52 limit, and I believe the camera's counter will dynamically adjust accordingly.

BTW The D7's estimate on the microdrive is 420 (for jpeg), but I can easily go over that most of the time...(ie over 550+)

[Edited on 8-7-2002 by NHL]

Louise Parrish Aug 7, 2002 12:12 AM

Memory Card Calculations
 
NHL

Thanks for your reply. It is the camera estimate, actual size has been so far about 1.6/1.8MB, therefore I would assume from what you are telling me that this number would get adjusted as I go along, am I correct. Thanks again.

Louise P.

NHL Aug 7, 2002 5:49 AM

Louise P.

Yes you are correct. Each file size varies with the scene as well as the compression used by each camera.

On my D7 for example, the output varies anywhere from 1.6Mb to 3.1Mb on the lowest compression jpeg setting. Highly detailed and color scenes will usually result in bigger file sizes. The camera doesn't know this ahead of time so it made an average worst-case assumption, and depending on what you shoot, you could have a larger total number of shots than what the camera originally estimated... On very large storage like the microdrive, it could be off by by close to 200 frames with studio shots on monochromatic backdrop !!!

Without compression RAW output is usually the closest number of bits put out by a 2560x1920 CCD of a camera.

[Edited on 8-7-2002 by NHL]

Louise Parrish Aug 7, 2002 10:42 AM

Memory Card Calculations
 
NHL

Thanks for sharing your knowledge, this is now quite clear to me.

Louise P.


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