350D 18mm SA200

Robin Leadbeater

I just made a few checks indoors using a red LED with my 350D DSLR, 18mm lens with a Star Analyser 200 on the front.  There was a slight reduction in dispersion close in but once beyond 5m the change was very small

Relative to the dispersion at 10m, the dispersion reduced by

5m =0.9%    1m = 3.5%  0.5m = 5.7%