Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
Why are more expensive scopes so much brighter at high power?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="Hugnot" data-source="post: 2903101" data-attributes="member: 115658"><p>From Wikipedia:</p><p></p><p> "The <strong>Rayleigh criterion</strong> shows that the minimum angular spread that can be resolved by an image forming system is limited by <a href="https://en.wikipedia.org/wiki/Diffraction" target="_blank">diffraction</a> to the ratio of the <a href="https://en.wikipedia.org/wiki/Wavelength" target="_blank">wavelength</a> of the waves to the <a href="https://en.wikipedia.org/wiki/Aperture" target="_blank">aperture</a> width. For this reason, high resolution imaging systems such as astronomical <a href="https://en.wikipedia.org/wiki/Telescope" target="_blank">telescopes</a>, long distance <a href="https://en.wikipedia.org/wiki/Telephoto_lens" target="_blank">telephoto camera lenses</a> and <a href="https://en.wikipedia.org/wiki/Radio_telescope" target="_blank">radio telescopes</a> have large apertures."</p><p></p><p>Small aperture width, more diffraction & image degradation. Light from a tiny little exit pupil of 2mm or smaller will easily fit into any eye pupil.</p><p></p><p>Diffraction - bending of light waves caused by the aperture becoming a secondary source (propagating) of light waves - light spreading, less intensity. making an increased dull fuzzy image or sometimes an image consisting of concentric rings.</p></blockquote><p></p>
[QUOTE="Hugnot, post: 2903101, member: 115658"] From Wikipedia: "The [B]Rayleigh criterion[/B] shows that the minimum angular spread that can be resolved by an image forming system is limited by [URL='https://en.wikipedia.org/wiki/Diffraction']diffraction[/URL] to the ratio of the [URL='https://en.wikipedia.org/wiki/Wavelength']wavelength[/URL] of the waves to the [URL='https://en.wikipedia.org/wiki/Aperture']aperture[/URL] width. For this reason, high resolution imaging systems such as astronomical [URL='https://en.wikipedia.org/wiki/Telescope']telescopes[/URL], long distance [URL='https://en.wikipedia.org/wiki/Telephoto_lens']telephoto camera lenses[/URL] and [URL='https://en.wikipedia.org/wiki/Radio_telescope']radio telescopes[/URL] have large apertures." Small aperture width, more diffraction & image degradation. Light from a tiny little exit pupil of 2mm or smaller will easily fit into any eye pupil. Diffraction - bending of light waves caused by the aperture becoming a secondary source (propagating) of light waves - light spreading, less intensity. making an increased dull fuzzy image or sometimes an image consisting of concentric rings. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Hunting
Extreme Long Range Hunting & Shooting (ELR)
Why are more expensive scopes so much brighter at high power?
Top