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40mm versus 50mm |
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tpcollins
Optics Journeyman Joined: January/12/2009 Status: Offline Points: 428 |
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Posted: January/24/2011 at 15:18 |
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.
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supertool73
Optics God Superstool Joined: January/03/2008 Status: Offline Points: 11814 |
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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.
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Bitterroot Bulls
Optics Master Extraordinaire Joined: May/07/2009 Location: Montana Status: Offline Points: 3416 |
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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.
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-Matt
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moeman
Optics GrassHopper Joined: December/15/2010 Location: usa Status: Offline Points: 34 |
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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.
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