Question re: 10D and Rebel 300D

[Brianbar]

I was wondering if there is some internal difference apart from the obvious between the 10D and the Rebel 300D. (6.3 mb)
I have a 10D and my wife the Rebel 300D, we are both using SanDisk Ultra 11 512mb cards, both cameras are set at 200 ISO, both set to the Best Large Quality and both on "P" (Program AE)
When we start with memory cards cleared of all images, on my 10D it tells me I have 197 shots remaining, the Rebel has 154.
Just wondering why.

Thanks
Brian

[robertwgross]

When we start with memory cards cleared of all images, on my 10D it tells me I have 197 shots remaining, the Rebel has 154.
Just wondering why.

Just because the memory cards are cleared of all images, that does not mean that they are clean and empty. You might try a complete format in the computer, just to make sure they are really clean and empty. Then put them back into the cameras and do a quick format there.

You get small differences in the number of files saved to a CF card depending on ISO. Since you say that you have ISO 200 in each... I think there might still be some difference in the noise and hence the file size.

---Bob Gross---

[Brianbar]

Thanks for your response Bob, tried re formating on the computer and camera as you suggested, I'm still only getting 154 on Rebel.

Thanks
Brian

[CyberDyneSystems]

In both cases the nuber of shots remaining dsiplayed is an "estimate"

there are a number of variables that make shots different sizes from one to the next.. color info, details,. etc..

It would seem that one Camera choses a slightly more consertive estimate.

[mikeymike]

i use the same card in my 300d but i get way more than the starting estimate on my card, like about 20% more some times.

[Jon]

The 300D estimate is probably based on the assumption that you'll be using the "Basic" modes where the camera chooses the ISO at somewhere between 100 and 400. Therefore, it's more conservative than the 10D, which figures you're molre likely to be shooting in the "Creative" zones all the time, so know what ISO you'll be using. Try changing the ISO and watch the frames available change sometime.

[Brianbar]

Hi Jon,
Thanks for your response, but as already mentioned both cameras are in (P) Creative zone.

Brian

[Jon]

Which mode you're actually in doesn't affect whatever Canon hard-coded for "default" file sizes at various ISO settings. I said that Canon assumed you'd be using "Basic" modes on the DR in setting the default assumed file size, not that you were necessarily in one of those modes, and therefore that Canon used a more conservative file size as the default used in calculating frames left.