300d image count

from some reason while shooting it keeps changing
if it says i have 112 and i take photo and turn it off and come back to it in a few minutes it says i have 120 pix

just wondering if anyone else is running into this.

As far as I am aware it is because the number of available pictures will vary depending on the type of pictures taken.
The size of the picture file depends on how 'detailed' the picture is, I am sure that somebody will go into better detail than this, but from what I know if you take a picture of a blank wall and a picture of a field of flowers the blank wall picture will be a considerably smaller file size because not many pixels are used used compared to the flower picture (In very basic terms)

Because of this the camera can only make a best guess at the number of pictures available.

Hope this helps but I am sure somebody will provide you with a more technical response.

Skids

i didn't think of that
ok thanks
i've seen photos that are higher in file size and didn't think it'd affect the amount but i guess so

My 300D is very consistent with pictures remaining. However, the number will decrease as you increase the ASA. This threw me at first. Maybe you changed the ASA without thinking about it.

you know what i sure did
thanks

Apologies for sounding dumb but what is the ASA?

The European version of ISO

In the old days in the USA, film sensitivity was on a scale developed by the American Standards Association (ASA), so we purchased film that was ASA 25 or 64 or 100 or something.

That got into the International Standards Organization (ISO) as an international standard, not necessarily European. So now we shoot ISO 100 or 200 or something. The scale is the same.

---Bob Gross---