A lens element in which at least one face is shaped to a surface of revolution about the lens axis,including conic sections but excluding a sphere.
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A lens having at least one surface that is formed like a portion of a cylinder. cylindrical lenses are used to correct astigmatism in the eye, and in rangefinders, to produce astigmatism, stretching a…
wide-angle lens--A lens whose effective focal length (EFL) is considerably shorter than the diagonal dimension of the image it forms.
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1) Never worry about it any more. Always have an angel in your pocket.
2) These 15 fine writing instruments are just what you need to write your favorite loved one with.
3) Each pen comes with am…
we are the professional supplier and exporter of Ball & Roller Bearings in medium and big size types which serves all kinds of industrial fields.
Our group bearings company has build up several bear…
we are the professional supplier and exporter of Ball & Roller Bearings in medium and big size types which serves all kinds of industrial fields.
Our group bearings company has build up several bear…
we are the professional supplier and exporter of Ball & Roller Bearings in medium and big size types which serves all kinds of industrial fields.
Our group bearings company has build up several bear…
We produce mild steel wire, galvanized wire and brass wire for making of wire clearning ball. Our wire products for cleaning ball enjoy the feature of rust resistance, high lustre, good flexibility an…
we are the professional supplier and exporter of Ball & Roller Bearings in medium and big size types which serves all kinds of industrial fields.
Our group bearings company has build up several bear…
we are the professional supplier and exporter of Ball & Roller Bearings in medium and big size types which serves all kinds of industrial fields.
Our group bearings company has build up several bear…
ECROBOT CO., Ltd, Business Registration Number : 220-88-71747, CEO J.W.Park, TEL : +82-2-552-7676, E-mail : E-mail : Contact us Address : (Hwanghwa B/D 11F, Yeoksam-dong)320, Gangnam-daero, Gangnam-gu, Seoul, South Korea