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Message: <blockquote data-quote="Binastro" data-source="post: 3474555" data-attributes="member: 111403">My three score and ten have gone quite a while ago, yet my pupils probably exceed 5.5 mm although I haven't photographed them lately, A few years ago they were 5.8mm and 5.9mm in almost total darkness after twenty minutes dark adaption.It never gets totally dark in England unless you are in cave system, and even here there may be luminescence.It was totally dark on mount Teide and I nearly fell into the caldera. That's about as dark as I have experienced.The book Catch me if you Can describes how sensitive young eyes get in a totally dark Fench prison. Frank Abignale's book.I frequently see young eyes particularly girls on T.V. whose eyes are clearly 9mm.My eyes certainly exceed 4.2mm here on a dull overcast day.Yes, we have an enormous choice in binoculars, but they are way behind current astro eyepieces.82 deg eyepieces retail for £100 now, probably less in the U.S.For me, I still want the 80 deg FMC binoculars which should be a doddle to design.I have an idea that the c.1955 Hensoldt 16x56 weighs about 640 gm. 69 degree AFOV. I haven't access to mine at the moment, perhaps Jan can weigh his sample with leather cover.It is very light.I think it puts the 8x42 Monarch HG to shame.The Hensoldt is also exceedingly good.</blockquote>