Thread: Is my scope ruined

Was about to say the same thing as m101a1, but thought I's better just read to the bottom haha... Dry internals is the key, doesn't matter if the thing is gassed on argon nitrogen or whatever in reality. Having no oxygen in the thing slows down mould or lense-spot growth, but it really isn't a 'must do'. As someone sugested, a large plastic bag attached to an argon welding reg with a small hole in one corner is a useful impromptu regassing setup. Wrap/roll the bag up to purge as much air out as possible, or even better attach it to a vacuum pump and suck the air out of the bag. Open the argon cylinder and let the bag reinflate with the purge hole pinched off so you only have mostly argon in the bag, then reassemble the scope. Job done!