I am looking for 20x80 binos to compliment my airline portable 8" F5 dobsonian as an ultra compact set up while travelling.
I was looking into Opticron Oregon 20x80 as I read in the reviews it gives a brighter image then the chinese models, however its out of stock in the EU until september 1st. And new regualtions mean taxation when ordering from UK.
I was wondering if anyone had performed the light test and found out whether there is a single 20x80 that is true 80mm aperture, in the lower to middle price range?
Alternatively I was looking at a better 15x70 model. If 15x70 is clear aperture then the difference in light grasp isnt that much between it and the average 20x80 model, and I honestly prefer the sparkly look of a larger exit pupil. 4mm is large enough for me, but still I will rather pick up a true aperture 15x70 then obstructed 20x80. Oberwerk ultra 15x70 comes to mind, but price is a factor...
So...has anyone made a measurement? ☺