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You can recablibrate it if you do get it wrong - http://elekm.net/zeiss-ikon/repair/collimate/
http://members.tripod.com/rick_oleson/index-123.html
danb-
Yeah @TooTallTim It should be recoverable.
I think you can also focus to infinity outside in daylight with a bit of tape or donor film in the gate, although the methods that @danb have linked to look far more accurate
Ste_S
immediately fucks it up