Aspherical vs not aspherical
Aug 20, 2012 09:40:09 #
What does aspherical do for you? Is aspherical relevant for prime lens as well as zooms?
Aug 20, 2012 09:45:39 #
donrent
Loc: Punta Gorda , Fl
Do you want my long version or my short version ??
OK... Here's my short answer version;
What de 'ell is aspherical meaning in camera termiknowdlege ??
OK... Here's my short answer version;
What de 'ell is aspherical meaning in camera termiknowdlege ??
Aug 20, 2012 10:03:19 #
http://en.wikipedia.org/wiki/Aspherical_lens
Wiki is your friend...
Wiki is your friend...
jmccl wrote:
What does aspherical do for you? Is aspherical relevant for prime lens as well as zooms?
Aug 20, 2012 10:17:39 #
Here is a link to Canon's explanation:
http://www.canon.com/camera-museum/tech/room/hikyu.html " rel="nofollow" target="_blank"> http://www.canon.com/camera-museum/tech/room/hikyu.html
It's not really a new concept.
http://www.canon.com/camera-museum/tech/room/hikyu.html " rel="nofollow" target="_blank"> http://www.canon.com/camera-museum/tech/room/hikyu.html
It's not really a new concept.
Aug 21, 2012 08:42:34 #
Aspherical lens contains extra elements with in the lens, that allow light rays to converge at a single point (Focal point) along the focal length. This prevents stray light rays from defracting (bouncing} off the walls of the lens, cuts noise out! but more important (better control) so that the light rays strike the center of the pixel well. Greater focus less distortion.
a win win
Tony
a win win
Tony
Aug 21, 2012 10:06:19 #
docrob
Loc: Durango, Colorado
donrent wrote:
Do you want my long version or my short version ??
OK... Here's my short answer version;
What de 'ell is aspherical meaning in camera termiknowdlege ??
OK... Here's my short answer version;
What de 'ell is aspherical meaning in camera termiknowdlege ??
your great with short - irrelevant answers today don.
Aug 22, 2012 16:57:47 #
trebor
Loc: Erie, PA
In many ways, the simplest optical surface to manufacture is a section of a sphere. But this is not a perfect imaging air/glass interface - its major defect is in fact called "spherical abberation". Corrections are most often achieved by using multi lens systems. Alternatively, specially contrived non-spherical (aspherical) surfaces can be designed to improve the situation for a single lens.
Aug 22, 2012 17:36:10 #
Shortest of the short. Aspherical lens, not spherical, reduces chromatic aberrations, and ocular distortion, such as leaning buildings in wide angle shots. Lens Good UGH, NUFF said.
Aug 22, 2012 18:42:32 #
I tell my students that if they want the best lens/camera they should look for the aspheric designation on the lens!
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