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If everything is equal is bigger scope brighter?

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 01:17
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Hi

A general question.

If everything is equal, lets say all swarovski scopes. If the exit pupil is set to be the same size why are 50 objective brighter than 24 or 32 in dusk?

Example:

3-9x42 set at 6 power s 7mm exit pupile
8x56 is 7mm exit pupile

Why are larger objective brighter dusk even if a smaller objective is set for larger exit pupile?

My larger variables 50 and 56 always appear much brighter than 24 and 32 even if smaller are set for 1 or 2mmm larger exit pupile and should hence take in more light.

Many optic articles just state the fact but nobody explains it.

Thanks in advance 

 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 06:41
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Fairly simple that.  The larger the Objective, the more light is collected and concentrated into the exit pupil.  The objective size changes way more then the exit pupil comparatively.  So large Objective scopes with close to the same exit pupil (and the same glass) should always be brighter...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 06:54
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Seems like a big difference. 24 diameter is sh*t in low light even if set at 2 power 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 07:08
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IIRC it is called "twilight affect" the larger image from the 50 mm scope will appear brighter simply because it is larger.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 07:37
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Originally posted by magshooter1 magshooter1 wrote:

IIRC it is called "twilight affect" the larger image from the 50 mm scope will appear brighter simply because it is larger.
 
Well that's close, but I think you're referring to twilight factor which is based on magnification that makes the image larger, not the objective lense. Bottom line is a larger objective lense has more light falling on it and therefore can transmit more light from an intensity (or concentration) standpoint.
 
  You will never be able to fairly compare two scopes that have two different sized objective lense's because they will have different exit pupil sizes if set at the same magnification or different magnification values when set to the same exit pupil size.


Edited by Roy Finn - September/19/2013 at 07:43
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 07:41
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Yep,
Like in plumbing... doubling the size of the pipe (say 1/2" to 1" dia) Squares the flow thru it.
If 1/2" flows 4 gal minute then a 1" pipe flows 16gal minute.
 
You simply have a LOT more light gathered by a bigger Objective...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 07:52
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Well to let the secret out the bag..... each scope has a bunch of elves in them, they all have miniature flashlights and help to make things brighter when needed.  You can shove more elves in the bigger objective hence more flashlights and brighter pictureBig Grin
Obviously just kidding. 
 
The technically advanced literate optics gurus would be best explaining this, Iyla? RD?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/19/2013 at 07:59
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Hey I was using laymans terms...  Showed my plumbers crack and all!!!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2013 at 12:56
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Originally posted by magshooter1 magshooter1 wrote:

IIRC it is called "twilight affect" the larger image from the 50 mm scope will appear brighter simply because it is larger.
 
Well that's close, but I think you're referring to twilight factor which is based on magnification that makes the image larger, not the objective lense. Bottom line is a larger objective lense has more light falling on it and therefore can transmit more light from an intensity (or concentration) standpoint.
 
  You will never be able to fairly compare two scopes that have two different sized objective lense's because they will have different exit pupil sizes if set at the same magnification or different magnification values when set to the same exit pupil size.
 
 
 
agreed Big Smile


Edited by Roy Finn - September/20/2013 at 13:25
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2013 at 14:33
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zex -
You might be interested in the Low-Light Performance Calculator at scopecalc.com.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/20/2013 at 23:31
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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2013 at 06:10
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I don't know of any scopes that collect light, however I know a few that transmit available light.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2013 at 17:12
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Originally posted by budperm budperm wrote:

The larger the Objective, the more light is collected...
As long as you've been here, I don't believe you said that.
Oh wait, looking at your pic- I take it back, I do believe you said that.


Originally posted by Code4 Code4 wrote:

I don't know of any scopes that collect light, however I know a few that transmit available light.
Good job.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/21/2013 at 18:07
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It is not the size that matters it is how you use it.

But back on topic, Yes...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2013 at 10:51
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I just did an internet search for 'light collecting telescope.' Google came up with over 9,000,000 results. Some people must find the terminology useful.

From HubbleSite:
"Telescopes actually work by collecting more light than the human eye can capture on its own."

A rifle scope is a telescopic sight, is a telescope.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2013 at 14:05
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Semantics Semantics.... Next book burnings...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/22/2013 at 14:45
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Get Your Popcorn Ready
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 04:43
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Bigger is Heavier....Eek      
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 05:32
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Ya say something in laymen terms and get taken to task... Hippie
 
I've lost count of how many arguements I've gotten into over electronics that were semantics based... Course some of it comes natural depending on wether you follow eletron flow or hole flow ideology and or US versus Europe naming conventions...  In England a transistor is a valve... Shocked
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 05:49
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Originally posted by budperm budperm wrote:

Ya say something in laymen terms and get taken to task... Hippie
 
I've lost count of how many arguements I've gotten into over electronics that were semantics based... Course some of it comes natural depending on wether you follow eletron flow or hole flow ideology and or US versus Europe naming conventions...  In England a transistor is a valve... Shocked


Bud, I've always been more interested in hole flow. Ya know what I mean?

Excellent
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 06:05
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ain't is in the dictionary... that doesn't make it "proper usage"...
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 06:11
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True dat, but with "Common Core" da Pimps and Hoes don't mind... Loco
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 06:12
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Originally posted by Peddler Peddler wrote:

Originally posted by budperm budperm wrote:

Ya say something in laymen terms and get taken to task... Hippie
 
I've lost count of how many arguements I've gotten into over electronics that were semantics based... Course some of it comes natural depending on wether you follow eletron flow or hole flow ideology and or US versus Europe naming conventions...  In England a transistor is a valve... Shocked


Bud, I've always been more interested in hole flow. Ya know what I mean?

Excellent
 .
 
 
 
Your BAAADDDD  you old billygoat! Smile
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 06:14
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HEY, I resemble that.

Howdy
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: September/23/2013 at 17:01
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Originally posted by Kickboxer Kickboxer wrote:

ain't is in the dictionary... that doesn't make it "proper usage"...


The preceding piece of wisdom is from a guy from Lufkin, Texas!!!   Shocked  I once saw a buffalo on a double date with two Hereford heifers in Lufkin ( it was Happy Hour ).....Bucky





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