Kevin Purcell
Well-known member
I'm curious is anyone has added tethered objective covers on their Yosemite.
Given the markings on the plastic covers provided (an embossed "44") and actually measuring the covers with my cheapo ruler they're 44mm ID.
So that seems like the "Eagle Optics Tethered Binocular Lens Cover Set (Small)" should work.
http://www.eagleoptics.com/index.asp?pid=3185
Anyone used these? What sort of plastic are they made from (the Vortex soft rubbery stuff or the harder plastic?).
The 44mm is a bit larger than I expected given the stated 30mm aperture. In fact the aperture diameter is (again eyeballing the cheap ruler) is greater than 30mm, perhaps about 32mm.
Henry Link has said there is an internal aperture stop that results in a smaller effective aperture (of 28mm). I've not measure the exit pupil of my Yosemites yet (but I have an accurate way to do it, I think).
One can see an aperture stop immediately behind the objective which I suspect sets the aperture to the specified 30mm though there may be other stops in the system.
Given the markings on the plastic covers provided (an embossed "44") and actually measuring the covers with my cheapo ruler they're 44mm ID.
So that seems like the "Eagle Optics Tethered Binocular Lens Cover Set (Small)" should work.
http://www.eagleoptics.com/index.asp?pid=3185
Anyone used these? What sort of plastic are they made from (the Vortex soft rubbery stuff or the harder plastic?).
The 44mm is a bit larger than I expected given the stated 30mm aperture. In fact the aperture diameter is (again eyeballing the cheap ruler) is greater than 30mm, perhaps about 32mm.
Henry Link has said there is an internal aperture stop that results in a smaller effective aperture (of 28mm). I've not measure the exit pupil of my Yosemites yet (but I have an accurate way to do it, I think).
One can see an aperture stop immediately behind the objective which I suspect sets the aperture to the specified 30mm though there may be other stops in the system.