Quote Originally Posted by blackcrystal22 View Post
Yeah, exactly how to be able to tell how far a 200 or 300mm lens will zoom in.
A LOT.

i don't know the conversion, but if you take a picture from all the way out and one all the way in with some type of ruler in the image i may be able to figure out magnification.

300mm lens are used to photograph stuff that is far away. Over the summer i picked up a 300mm tameron lens from a guy off CL . he had the nikon mount for it too. I do a lot of birding when its warm so that 3oomm lens was a real help. Before that i was birding with a 105mm