Nikon D80. I'm having a hard time getting close to certain small subjects that unfortunately don't want me getting too close I currently have a 200mm lens. I'm not sure how this all works. What would a 300mm lens do for me? Would my subject simply be 1.5X larger or is there more to it than that? Also, someone was explaining teleconverters to me once and I was lost. Something about the sensor size of the camera. Basically it was implied that it's not just a simple multiplication. Can somebody help me out here with some real simple discussion? Basically what I'm looking at is an affordable 300mm zoom, which is doable compared to a 400mm zoom which is out of the question. I'm also looking at 1.4X teleconverters. Or a combination of both. Would my 200mm with a 1.4X be roughly equivalent to a 300mm in terms of magnification? I understand the loss of light and potential for autofocus failure - thankfully these subjects are very brightly lit.