Originally Posted by
Wazzoo
In which case they are not fully photochromic and are thus ok?
That is absolutely correct. As far as I know, the JAA photocromic 'ban' is aimed at lenses that go from 'clear' to 'dark'.
Serengeti lenses only go from 'dark' to 'darker'.
Also, bear in mind the clear photocromic lenses will have some sort of focusing ability (whereas the majority of Serengeti lenses won't). Therefore, the user will need them to see and this might be restricted if they don't 'clear' quickly enough. If Serengetis are temporarily too dark, then the pilot can just remove them!
I fly with Serengeti Drivers Gradient lenses and basically use them in all conditions except at night. They are particularly good at improving contrast in flat light conditions.
HTH,
B73
PS Has anybody actually seen a reference to this JAA photocromic 'ban' outside of the HP&L textbooks? I can't remember seeing it in the ANO or AIP...