PGYTech filters - I couldn't get them to work prior to start up, they were catching the gimbal. I emailed PGY they replied, quite promptly, long story short if you give them a little turn once pushed on it seems to seat them a fraction more deeply - not even visible to the eye but enough to allow the gimbal to do its dance. If not they will replace them apparently. Happily mine now seem to work, so far. Thought this info might be useful to some.
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