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Does objective size make a difference?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 09:35
nickorette View Drop Down
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I was told that in the middle of the day that it makes no difference weather you use a 44mm objective or a 56mm objective. That the only time larger objectives are useful is when it's dawn or dusk. Is there any truth to this?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 09:50
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Aside from the magnification and image clarirty issues yes. It also makes little difference in low light depending on the power setting. With either scope objective vs exit pupil is based on magnification setting. an exit pupil of 7mm is just that 7mm regardless of objective size.
For example, a scope with a 42 mm objective set at 6 power has an exit pupil of 7.
Like wise a scope with a 56mm objective set at 8 will also have a 7mm exit pupil. You will not see any appreciable difference between the two scopes if all other things such as glass quality and coatings are the same.
 
Welcome to OT.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 09:50
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As long as the exit pupil (objective size of the scope divided by the magnification power) is larger than the pupil in your eye this is true.  But you get a very high power scope like a 18x to 24x on a 40 mm objective and at those higher powers looking through your scope will be darker than it truly is outside.  This applies at night as well.  A bigger obkective will allow you to use a higher maginication is the same light as one with a smaller objective and have more brightness, now matter what the light.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 10:11
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I found, looking through my my Leupolds, that the one with the 50mm lens is a smidgeon (now beat that for a scientific word) clearer then the 40mm. Both looked through on a bright day.
If a person do not mind the extra bulk and price, go for the bigger objective.
Of course, theoretically speaking, Cyborg and superstool is 100% correct.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 10:20
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Now 8shots, I am thinking it is only 1/2 a smidgeon or at the very most 3/4 of a smidgeon brigher.  There is just no way it is a whole smidgeon brigher, I just don't care what you say.  Na%20Na
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 10:23
cyborg View Drop Down
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Kind of like saying a hair. If you were to say a hare, then that would be relative to what size the hares are where you reside, and some of them things get big.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 16:06
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Cyborg didn't say what kind of hair he was talking about....................Bucky       
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 16:07
cyborg View Drop Down
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Cencored
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 16:22
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I believe that in some cases, a larger objective lens can also provide a slight improvement in resolution.  Koshkin can speak to this better than I can.  Basically, a larger objective allows the optic designer to increase the magnification of an optic and still maintain the maximum light transmission your eyes can use.  But, as was stated, once you reach about 7mm exit pupil, further increasing the objective size doesn't provide any additional usable light transmission.  In other words, a 6X scope doesn't need to have an objective lens larger than 42mm.  Likewise, an 8X scope does not benefit from an objective diameter larger than 56mm.  In both cases, the optic has a 7mm exit pupil.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 16:29
cyborg View Drop Down
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We've all heard it before "Size don't matter"   Laugh
 
Although the resolution aspect is what I had alluded to earlier.  
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 17:03
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"Cyborg and superstool is 100% correct."
 
I just couldn't let this go by. Wink  superstool and superstool just bring totally different pictures to my mind.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 17:09
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What the crap?  Are you call me a stool?  Laugh  Ya someone named Chris Farris set the word filter so anytime someone writes super_tool it comes out as superstool.  I hate him. Nut%20Kicker

Edited by supertool73 - March/18/2008 at 19:03
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 17:35
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So does a bigger objective mean better resoloution if you have two scopes of the same make and model only with one being a 40mm and the other being a 50mm and they are set to have the same exit pupil? If so, how much better is it?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 17:38
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Better resolution at higher magnification. otherwise it's more determined by glass and coatings quality, and over all scope design.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/18/2008 at 19:01
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Originally posted by cyborg cyborg wrote:

Cencored
 
 
 
                                                                            Roll%20on%20Floor%20Laughing
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2008 at 01:58
8shots View Drop Down
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superstool, I thought I was not that rude. Blame Chris Angel
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: March/19/2008 at 07:43
cyborg View Drop Down
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Originally posted by superstool73 superstool73 wrote:

What the crap?  Are you call me a stool?  Laugh  Ya someone named Chris Farris set the word filter so anytime someone writes super_tool it comes out as superstool.  I hate him. Nut%20Kicker
 
   Laugh%20Above
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