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Message: <blockquote data-quote="Alexis Powell" data-source="post: 1756126" data-attributes="member: 5327">Yes, I agree that it is more common with porros...but I'm still left with the same question, which is why WHEN IT IS THE CASE THAT different powered binos utilizing the same ocular + prism assembly are made, it is often or maybe always the case that they are made with differing diameter objectives such that they have equal or nearly equal exit pupils.  This situation applies to the premium pocket roofs.  As for roofs, maybe it's not so common in the premium brands, and maybe not as much these days. In the past, we had the Zeiss 7x42 and 8x56, 8x30 and 10x40 Classics, the B&L 7x36 and 8x42 Elites to name a few off-hand, and it's been very common in the mid-priced range to have 8x42 and 10x50 pairs.--AP</blockquote>