If you get the "Sorry, the file cannot be displayed. There seems to be a technical issue ..." error when trying to view an image, a workaround is to click on the cog icon in the upper right side of the media viewer, and then select "Disable Media Viewer". We are aware of the problem and are looking for a solution.
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.)