Hello Apologies up front for what is probably a very stupid query. I've used 'consumer' cameras for some time both stills and video and am looking to get a bit more serious. I 'get' white balance and aperture, ISO etc but what i don't get and no book or magazine i've read has yet been able to do this for me is this: On consumer cameras the optical 'magnification' achieved via 'zooming in' is described as x3, x5 or x10 etc etc But once you move into DSLR territory obviously it isn't described in this manner but how do I compare? What focal length on a lens gives me approximatlely what X magnification. It's a bit like converting metric to imperial but i don't know the 'how' See I said this was a daft question, i'm sure i've even asked it badly! Thanks for any help you can give.