Shoutbox

Two things can be happening (actually 3 things if you count the fact that he accidently did change some camera settings):

1) Either the files are not BMP's and not 1.8Mb, but due a browser bug (Inetrent Explorer) they can only be saved as BMP's. So nothing to worry about when you use a different browser.

2) The files uploaded are not JPG's but another format (like for example BMP's) and thus increased in filesize. This can occur if you don't pay attention when you download the files from your camera with specific software.

So to pin-point the exact cause, we need a bit more info. Like: What browser is being used to download the files from the net. Is he using "special" (but unneeded) software to download his pics from the camera (and thus maybe accidently converting some to another format).

All in all, and because of "some pictures are viewed on a very big resolution" I rather suspect he did change the camera settings or a conversion takes places when grabbing the pics from the camera...