I have an old pair of Zeiss Deltrintem. Collimation seems OK, image a bit dim (compared with much newer Deltrintis). Is there any internal cleaning I can do myself without messing up collimation?
First look through the binoculars backwards keeping your face about a foot behind them. If you notice any fogginess as you look through then they will need to be taken to a service centre for repair. Your local camera shop may know of a repairman. I can advise for Australia, but not so much for the USA of Britain. In USA the one company I am aware of is Captain's Nautical Supplies in Seattle.
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First look through the binoculars backwards keeping your face about a foot behind them. If you notice any fogginess as you look through then they will need to be taken to a service centre for repair. Your local camera shop may know of a repairman. I can advise for Australia, but not so much for the USA of Britain. In USA the one company I am aware of is Captain's Nautical Supplies in Seattle.