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40mm versus 50mm

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/24/2011 at 15:18
tpcollins View Drop Down
Optics Journeyman
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I'm thinking of replacing the 2.5-10x40mm Elite 4200 on my Ruger .243 with something in the 4-16 power range. I have the room with the factory rings to accomodate a 50mm objective but was wondering if the 25% larger lens is going to be an overwhelming view or just a bit brighter?
 
I have seen the considerable differences in my 8x20, 8x32, and 8x42 binoculars when hunting just before daylight. I'm just wondering if the 50mm is going to blow me away versus the 40mm? I'm really not wanting to put something that looks like a soup can on my rifle unless there is a considereable difference I could appreciate. Thanks.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/24/2011 at 15:20
supertool73 View Drop Down
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Superstool

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If you go up in magnification it will benefit you.  If you are going to 16x I would say the 50mm would be very beneficial.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/24/2011 at 18:55
Bitterroot Bulls View Drop Down
Optics Master Extraordinaire
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I bet you would notice the difference just before daylight.  With the same rings, you're not changing your cheek weld, either.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2011 at 00:00
moeman View Drop Down
Optics GrassHopper
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Layman's version:
 
Divide the objective lens by the power of magnification:
 
e.g. 8X32 ='s 4mm
 
 Whenever the light available is LOW then your eyes dilate... When it is so low that your pupils expand beyond 4mm then your eyes exceeded the bino's (or scope). As we get older our eyes can't dilate as easily. 4-5mm is good.  3.5-4mm is OK...below 3.4mm is a daylight scope (IMO).
 
Painting w/ the broadest brush... Keep the bino's and scope above 4mm at the highest setting for the best low light performance in low light... Anytime other than  dawn and dusk the bigger objective lens will only add weight not performance. Keep in mind that resolution is separate from light gathering so a bigger objective lens on a cheap scope most likely won't touch a high quality scope w/ a smaller objective unless light is minimal.
 
Read here and check out their other articles:
 
 
 
 
 
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