Thanks trying to find out what there worth and age , think they are marine , vessel use ! Thought plane use spotting , depth of field is wild , go from limb to limb not have to focus .
Stepped outside and Extra Bright is fitting , swept over a street light and yes had to blink . Stars are very bright . Why pilot for spotting bouy’s and sign? Honda Monkey I passed today , also want to look at YamahaTW 200 !
I had the Steiner Predator model once. Deer would turn a light bluish color out in the woods. Supposed to do that to all animals, I guess people too. Thinking it worked from a heat source like ir but with a blue filter? Worked better early mornings and late evenings. They were self focus too, I don't really care for sf tho.