Hello binoculars enthusiasts,
I am quit new at binoculars hobby, but I have already dismantled and cleaned number of binoculars. Could You please share Your thoughts about prisms' black mat metal shield.
Why a lot of Porro-prism binoculars have just one shield (cover) on the prisms that are closer to the objective? It this fact only related to economical reasons? Or maybe it is just irrelevant to put the shield on the prism that is closer to the ocular? Of course cheap binoculars have none of these shields installed and these are not worth mentioning.
I have seen both prisms shielded on the one side when both prisms sit on the same removable shelf (very often this is a case then binoculars are collimated via prisms screws) for example KOMZ 6x24. Does this imply that both shielded prisms have better protection against straight light and thus superior to those binoculars with only single prism shield? Or there is another reason to install double prisms' shield due to construction features?
My question would be - is it worth putting the metal shield on all prisms in Porro-binoculars? Or it would be reasonably to leave as it is (there at present are only two shields).
I am pretty well aware of the advantages of blackening the edges of the prisms for further improvement, but it would be a different topic for a next time:)