N Type High Track Stand,ZJ-635

N Type High Track Stand,ZJ-635

Specification: Scope holder: N adapter Track Length:520mm Base Dimensions:320x305x16mm Coarse/Fine Focus Type: Coarse Focus Travel Distance:385mm Net weight: 3.56kg (7.85lbs) Dimensions: 320x305x536mm
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Product Details

N Type High Track Stand,ZJ-635

Specification:

Scope holder: N adapter

Track Length:520mm

Base Dimensions:320x305x16mm

Coarse/Fine Focus Type: Coarse Focus

Travel Distance:385mm

Net weight: 3.56kg (7.85lbs)

Dimensions: 320x305x536mm 


Industry product knowledge

Spherical aberration of lenses

 Spherical aberration occurs because spherical surfaces are not the ideal shape for a lens, but are by far the simplest shape to which glass can be ground and polished, and so are often used. Spherical aberration causes beams parallel to, but distant from, the lens axis to be focused in a slightly different place than beams close to the axis. This manifests itself as a blurring of the image. Lenses in which closer-to-ideal, non-spherical surfaces are used are called aspheric lenses. These were formerly complex to make and often extremely expensive, but advances in technology have greatly reduced the manufacturing cost for such lenses. Spherical aberration can be minimised by carefully choosing the surface curvatures for a particular application. For instance, a plano-convex lens, which is used to focus a collimated beam, produces a sharper focal spot when used with the convex side towards the beam s

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