One of my Alpa lenses isn't focusing at infinity when set at infinity, and I'd like to adjust it. Shimming won't help; it's focusing slightly closer than infinity, so shimming would only make it focus even closer. And my adapter is already nicely shimmed for my other lens.
I've seen past threads about how to do this (loosen the screws, turn the ribbed focusing ring for accurate focus, then tighten the screws), but those threads are for Cambo lenses. I messaged one of the original posters, and he confirmed that Cambo helicals are different from Alpa. On my Alpa lens, once I loosen the three screws in the distance ring, they come out completely, revealing three threaded holes in a round metal ring beneath (just barely visible through the small holes where the three screws were). When I turn the ribbed focusing ring independently, those three holes vanish; they're obviously attached to the ribbed focusing ring. It's no longer possible to re-attach the screws. There's nothing for them to screw into, just a solid brass-looking ring that's attached to the ribbed focusing ring.
Has anyone adjusted their infinity focus on an Alpa lens? Any suggestions?
thanks
ethan
I've seen past threads about how to do this (loosen the screws, turn the ribbed focusing ring for accurate focus, then tighten the screws), but those threads are for Cambo lenses. I messaged one of the original posters, and he confirmed that Cambo helicals are different from Alpa. On my Alpa lens, once I loosen the three screws in the distance ring, they come out completely, revealing three threaded holes in a round metal ring beneath (just barely visible through the small holes where the three screws were). When I turn the ribbed focusing ring independently, those three holes vanish; they're obviously attached to the ribbed focusing ring. It's no longer possible to re-attach the screws. There's nothing for them to screw into, just a solid brass-looking ring that's attached to the ribbed focusing ring.
Has anyone adjusted their infinity focus on an Alpa lens? Any suggestions?
thanks
ethan