PAULT Posted February 15, 2009 Report Share Posted February 15, 2009 can anybody enlighten on what it means the scope ive been looking at has a twilight factor of 16.9-36.7 is this any good in lowlight Quote Link to comment Share on other sites More sharing options...
Trussman Posted February 15, 2009 Report Share Posted February 15, 2009 Twilight factor is not a method of measuring performance in low light. Take for example a 6x42 scope. To work out the twilight factor you multiply 6 x 42=252. Square root that=15.87, so you have have a twilight factor of 15.9. However, this is doesn't demonstrate the scopes performance in low light conditions. A 6x42 scope from Swarovski, Zeiss, S&B etc., will have the same twilight factor as a 6x42 scope from an anonymous chinese brand that costs you a fiver of fleabay, and obviously the difference in performance is very noticeable indeed! Hope this helps. Quote Link to comment Share on other sites More sharing options...
PAULT Posted February 15, 2009 Author Report Share Posted February 15, 2009 can anybody enlighten on what it means the scope ive been looking at has a twilight factor of 16.9-36.7 is this any good in lowlight does anyone on here use a zeiss diavari 6x24x56 are they any good in lowlight thanx Quote Link to comment Share on other sites More sharing options...
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