Check out the amazing increased working distance on the Eakins microscope using a barlow lens to get a larger working area.
Bundle: http://s.click.aliexpress.com/e/b7ycSav2
Microscope: http://s.click.aliexpress.com/e/eN3Ec5a
Stand: http://s.click.aliexpress.com/e/bHSXalzm
C Mount Lens Adapters: http://s.click.aliexpress.com/e/cMimkzYc
Barlow Lenses: http://s.click.aliexpress.com/e/bmS9nWbe
Forum HERE
Podcast: Download