Chief Ray Angle // spreadpersepolis.com

Chief ray angle CRA November 21, 2013 By Admin A chief ray is the ray from an off-axis object point which passes through the center of the aperture stop of an optical system. I'm not an optics expert, but it's do with the angle of incident rays which travel through the very centre of the aperture. In a pin-hole camera, which has a very small aperture the only rays which reach the image plane would be chief or principal rays. high chief ray angles. The high chief ray angle can be detrimental to the image quality given the limited angular acceptance of the micro-lens array on the imager. This paper demonstrates that a 5 deg difference in the chief ray angle can cause a significant relative color issue only 71.6% of the ideal goal on the Micron 1.3MP imager. An. This can produce large chief ray angles in image space, regardless of sensor size. One way to correct for roll-off is by designing the lens to be image space telecentric. In doing this, the difference in the angle of the chief rays will be 0°, which produces even illumination. Another way to offset roll-off is to create unbalanced illumination. The high chief ray angle can be detrimental to the image quality given the limited angular acceptance of the micro-lens array on the imager. This paper demonstrates that a 5 deg difference in the chief ray angle can cause a significant relative color issue only 71.6% of the ideal goal on the Micron 1.3MP imager. An acceptable relative color value should be >95% but less than 105% for a good imaging system.

Impact of Lens Chief Ray Angle on Image Quality By Alex Ning, PhD January 31, 2005 1. Introduction Lens chief ray angle refers to the angle of incidence of an off-axis ray passing through the center of the lens stop on the image plane. 29.06.2019 · Expert news, reviews and videos of the latest digital cameras, lenses, accessories, and phones. Get answers to your questions in our photography forums. 一直不懂镜头的chief ray angle 是怎么计算出来的,是一个什么样的参数,有何意义?还请朋友们不吝赐教! 或者有这方面资料的朋友,能否传份给我. CRA: Chief Ray of Angle, Lens cra < Sensor CRA, 相差最好在2度以内,否则容易造成阴影或偏色 3.lens的主要参数: (1).焦距:镜头焦距的长短决定着拍摄的成像大小,视场角大小,景深大小和画面. LZ,关于Chief-Ray-Angle我也是有个定性的了解,但是具体定量的去解释我也不是很懂的,楼上的兄台说得是否在理我也不是很清楚,但是Sensor的Chief-Ray-Angle.

Abstract. The chief ray angle CRA of a mobile phone lens is related to the acceptance angle of the IR cutoff filter and micro lens array. The CRA of a lens need to be within an allowed value, otherwise image blurring or vignetting occurs.

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