I have a (non Firecrest) Hitech 10 stopper & the blue cast is easily removed if you want to but varies according to camera used I've found - the blue cast was quite prominent on my 40D but much less pronounced on a 6D.
As to the Lee holder coming off, I've got both genuine Lee adaptor rings & a couple of other makes - 'Serk' and 'the Filter dude' (tried the Serk as they make an 82mm WA adaptor with internal thread so you can use a lens cap) and the fit is definately looser with these compared to the genuine Lee rings.
Having said that, I beleive the lee holder is designed so that if you unintentionally snag the holder on something, it will 'only' pull the holder off rather than say toppling over your camera/tripod.
As to the Lee holder coming off, I've got both genuine Lee adaptor rings & a couple of other makes - 'Serk' and 'the Filter dude' (tried the Serk as they make an 82mm WA adaptor with internal thread so you can use a lens cap) and the fit is definately looser with these compared to the genuine Lee rings.
Having said that, I beleive the lee holder is designed so that if you unintentionally snag the holder on something, it will 'only' pull the holder off rather than say toppling over your camera/tripod.
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