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


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.