Transmission Spheres
Designed for Extended Range
Our transmission spheres are thoughtfully designed, allowing you to measure larger radius convex surfaces than others on the market.
All at a competitive quality and price
T-Sphere Information Here
F-Number, 4″ and 6″ Diameter
Any Shape
– Plano-convex or concave
– Bi-convex or concave
– Crossed cylindrical axis
– Cemented cylindrical doublets & triplets
– Precision rods and semi-rods
Tolerances
– Radii from 3mm to infinity
– Lengths (axial) to 650mm (25.6″)
– Widths (or diameters) to 10″
– Surface accuracies to 1/10-wave irregularity
Quality Control
– Interferometrically tested
– Surface qualities to 10-5
– Prototype to production quantity
Standard Tolerances
– Length (axial direction): +/- 0.10mm
– Width (power direction): +- / -0.10mm
– Center thickness: +/- 0.15mm
– Radius: +/- 0.20%
– Focal length: +/- 0.25%
– Surface figure: (max. irr. @ 633nm)
– 4-wave per 10mm
– 2-wave
– Surface quality: 60/40
– Wedge: 0.025mm maximum edge thickness difference
NOTE : Tighter tolerances can be achieved at an increased cost.
Precision Rods and Semi-Rods
Ideal for shorter focal length lenses are the use of precision polished rods, which can be cut down to form plano-convex sections (semi-rods). BK-7 rod blanks are kept in stock, per the table below, but other glass types and dimensions are available.