welcome to TekWiki and thanks for the nice pictures! Please don't take offense because I modified one.
BTW, is it possible that your D90 is configured not to correct lens distortion? The lenses you use would normally be covered by the stock firmware ... If you are interested, see http://nikonimglib.com/dcdata/#os-windows where Nikon make lens data updates available for download.
My main lens is an ancient Nikon 55mm f/2.8 Micro Nikkor. You're welcome to borrow it if you can deal with totally manual operation. I also have two cheap studio flashes you're welcome to borrow. (No fancy interfacing, just hot shoe.)