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Thanks Allan, the amount of time that passed between when I last used a film filter and used this prism with my TSA120 would make such comment nigh worthless, however, this prism is very very good.
Since the arrival of the FC76 Objective old Sol has not been kind to me, choosing to hide in Canberra rain clouds instead.
What I like most is that it is (in my humble opinion) far safer to use than any objective covering filter in that it cannot become dislodged and cause eye damage. Were it to fall off by some quirk of fate, the worst you would get is an empty feeling in your wallet and some unfocused light on your abdomen.
The brightness can be controlled with various ND filters or with a 'single' polariser. It must only be used with refractors of course.
The only danger I can see with these is if you remove the OD3 ND filter.
What I really like also is that to get the Solar image into the centre you actually stand back and look at the shadow formed by the dewshield and then the image on the ceramic tile.
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