Originally Posted by Dallaz

Yes. Sounds like you understand everything to me. I'm just saying to get the same picture with a full frame camera as you would be with a crop sensor camera at 200mm, you would have to use a 300mm lens. At which point your using all 12 megapixels from each camera. Because if you shoot both cameras at 200mm you would have to crop the image after taking it with the full frame cameras shot to get the same final
Image. In which case you are lowering the resolution of the final shot by cropping. The only reason I even mentioned a 300mm lens was so that you could use all 12 megapixels without having to crop the full frames image, which would yield less sharp looking results from the lowered resolution. Hopefully that is the answer you were looking for?