Bronco
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- Joined
- Feb 25, 2000
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Even where our more seasoned forumites are concerned, a larger objective lens can still be an advantage in low light viewing situations. For example, let's take an older gent who's pupils are capable of a maximum dilation of 5mm. As explained above, a pair of 7X35 binos will produce a 5mm column of light through the ocular lens; a seemingly perfect match for our imaginary friend. What we need to keep in mind, however, is that he must have perfect alignment between the image column and his pupil opening to get the maximum performance from these binos. Trying to maintain this perfect alignment can be both fatiguing and annoying, especially when the binos are hand held.
A pair of 7X50 binos, on the other hand, would yield a 7mm column of light providing a full 2mm of overlap. Obviously chasing perfect alignment is far less critical in this instance.
A pair of 7X50 binos, on the other hand, would yield a 7mm column of light providing a full 2mm of overlap. Obviously chasing perfect alignment is far less critical in this instance.