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wierd scope magnification question

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2009 at 20:13
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If I take a target and place it 100 yards away from me, then look at with the naked eye will this be roughly what it will look like through a 10 power scope a 1000 yards?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2009 at 21:46
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yes, but the mirage on a hot day, and any particulates in the air will make the 1000 yard image less perfect than the 100 yard image.  Also, any optic degrades an image by some tiny amount.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/26/2009 at 21:47
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not following this?please explain.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 07:27
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roughly.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 08:34
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depends if you have myopia or hyperopia the size may vary, far sighted people's image of the target would be more like 500 yds.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 09:44
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Originally posted by Dale Clifford Dale Clifford wrote:

depends if you have myopia or hyperopia the size may vary, far sighted people's image of the target would be more like 500 yds.


I were glasses. Will that make a difference
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 09:47
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Yes, in theory it will apear the same, but there are many outside factors that can't be controlled.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 10:06
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glasses for reading or driving?? few people have 20/20 vision.

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 16:40
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[QUOTE=Dale Clifford]

glasses for reading or driving?? few people have 20/20 vision.

[/QUOTE I don't have glasses for just reading or driving. They are for general ware. I ware them when I shoot.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/27/2009 at 19:30
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Far sightedness would not make much difference compared to someone with 20/20 vision.  The focal length of the human eye is only about 15mm.  Beyond a few feet nearly ALL light rays reaching the retina will be parallel.  Farsightedness  does not give one any magnified vision at distance, it simply means their eye is not capable of focusing close.  Most 20/20 people could resolve everything a reasonably farsighted person could at, say, 100 yeards.  Probably at 10 yeards.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 08:35
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farsighted 20/40 simply means someone can read the eye chart at 40 feet as opposed to someone who can't read it that far, only at 20 ft. if your farsighted the effect results in greater visual accuity at distances regardless of the focal length of the eye. thats why they get top pick in military flight school. farsighted is correct for closeness by increasing diopters, in regards to the question- nearsighted people will have more difficulty in using the old rule of thumb, 10x at 1000 yds = iron sights at 100  yds.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 10:25
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Dale, farsightedness is not a "better" eye--it is an eye disease.  A 20/40 result on the standard eye test would disallow you from any military flight school.  At least it would have in the Marine Corps when I was in.  It would indicate that you can only resolve at 20 feet what a "normal" eye can at 40.  A 20/15 result would be better than the normal and indicate you can resolve at 20 feet what a normal eye can at 15.  etc.  Visual accuity and focus distance are two different issues.  No ones eye can "magnify".   My optometrist tells me that once in a great while he will encounter someone who can read the 20/20 line at 20 feet and it will usually be a 10 year old kid who can see at 3 inches or a mile perfectly.  Old age far sightedness is just the lens hardening and losing it's ability to change focus.  As it hardens it flattens and leaves one's focus at distance.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 10:27
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should have said can read the 20/10 line at 20 feet.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 12:16
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ok 40/20 then-wolfee-- I think you have hyperopia and presbyopia confused, and certainly disease state confused, sickle cell anemia is certainly a disease state unless your in the middle of the desert without water, and gout is a disease state , unless your family has a history of cancer. shorter eyeball and inability to correct for the focal length needed to accomplish a task at a short distance is a clinical condition, as is thickening or crystallization of the lens to prevent focusing. If epidemiological determine significant statistical deviations then it can become a disease state-- adhd or obesity (except in ed's case which is HD-ADHD high definition adhd).  

Edited by Dale Clifford - January/28/2009 at 12:20
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 12:44
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In a vacuum, with no atmosphere and perfect vision at the point of observation:  a true 10X scope looking a a target 1,000 yards away will view the same as viewing a target unaided at 100 yards (same meaning target demensions will be the same) - with the obvious narrowing of field of view and the obvious glass quality playing many parts.  10X means the image is 10 times larger than it would be if viewed without optical assistance.

That's the simplified version, it gets far more complex from there.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 19:09
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What about all optics degrade vision some what? thats what I did not follow.

Edited by rifle looney - January/28/2009 at 19:10
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 20:18
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Rifle, if light has passed thru an optic before it reaches your eye, it will be effected in some amount. High quality lenses obviously degrade the image less.  A rifle scope has several lenses and the effects can be cumulative from one optic to the next.  You can detect this in most scopes by just looking at the extreme edge of the image.  It is easier to get the middle right, more difficult to get perfection from edge to edge.  Remember, his original question was comparing the image thru a scope vs with the naked eye at a closer range.  The advances in optics the past 10 or 20 years have been huge and this issue has more effect on theoretical discussions such as this than in reality.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/28/2009 at 20:22
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Thanks ...was just confused .
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/29/2009 at 08:16
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No optic has 100% light transmission.  If light passes through an object, some is absorbed by the materiall of the object, some is scattered, and some is reflected back toward the source; these are all reductions in the light that reaches your eye.

Optics do not "gather light", they transmit.


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