Bart,
I would only ever use an authentic Lenspen.
There's heaps of knockoffs available. I think from memory there's a warning on the Lenspen site mentioning to steer clear of knockoffs.
At the end of the day, they might be a bit more expensive (it's the shipping that kills it), but, you know you're getting the real deal. Anything else, while looking the same, may cause damage to your lenses. Or, sensor, if you're game.
H
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