50mb File sizes for stock?

I've seen a few stock sites demanding 50mb file sizes, does this mean I can only submit photos from a 1Ds MKII? I think thats the only DSLR that produces that size files.... I'm sure you have realized that.... no... I'm not a pro!

Thanks for any replies, peace.

Since 16-bit TIFFs from my 300D run about 36MB, a 16-bit TIFF from an 8.2 would be just under 50MB. The XTi and 5D would easily create 16-bit 50+ MB TIFF images.

The file size says little about a digital image. The file format and colour depth can give you a huge range of file sizes from images with the same number of megapixels taken with the same camera.

Also.. You can upsample with editing software and make any image file size as big as you want.

Which stock sites specifiy ONLY the file size of the images?