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Message: <blockquote data-quote="typo" data-source="post: 3190277" data-attributes="member: 83808">Ads,I'm sorry to say if you spot even a hint of dimming with an 8x20, it's very unlikely that you will stand any chance of being able see effective resolution differences between those two binoculars as your eye will be limiting. You may well detect other differences as I've been explaining.In low light the pupil of the eye dilates and your visual acuity gets worse but the effective resolution of the binocular improves. A binocular has to be very bad indeed to see spot these differences in low light. I have a $25 10x42 roof that I think is bad enough, but then the transmission is probably only around 50% so it's still possible that the differences I see in low light are eye limited.David</blockquote>