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Message: <blockquote data-quote="Troubador" data-source="post: 3320418" data-attributes="member: 109211">Hi DennisThere are many good reasons to choose SV 10x50 for sure but I wouldn't put base the choice on the twilight factor.For example HT 10x54 would have a factor of 23.24 beating the others in your list but wait a minute. It does this by multplying 10x mag by 54 objective but you would get the same answer if it had 54x mag and 10 objective, which wouldn't be much good at watching anything.As you said in an earlier post, its best to try before you buy.Lee</blockquote>