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Message: <blockquote data-quote="paddy7" data-source="post: 3557419" data-attributes="member: 88594">But we're not talking about someone young enough to have 5mm max dilation - the post was about having a max of 4mm.A friend - who is an acknowledged expert 'gull man' and fairly tight with his money - shelled out on at HT 8x42 a few years back and reckons he gets a min of 15mins extra at the extremes of the day. These replaced his previous 8x42s (can't remember the brand). So there is more than just size involved, particularly if through age you no longer get 5mm dilation. The quality of all the optical elements in the light path come into question. If your eye can only use 4mm of light, that's your limit.While the Zeiss FL 8x32 definitely drops out before the gull man's do, i wouldn't spend all my life carrying the extra bulk and weight for that sliver of time per day - unless i liked gulls a lot more than i do!</blockquote>