Cemented DoubletsClick part # for details or to add to shopping cart.
Specifications
Effective Focal Length (EFL): +/- 2%
Diameter (DIA): +0/- .18
Center Thickness (CT): +/- .25
Cosmetics: 60/40
Surface Quality: 2 1/2 X 1/2 waves @ 546.1nm
Clear Aperture: 90% of diameter
Centering Accuracy: 2 arc minutes TIA
Designed Wavelength: 486.1nm, 587.6nm, 656.3nm
Typically the first element (crown element) will be stepped down
in diameter by 0.2- 0.5mm with respect to the second element.
All dimensions in millimeters.
All information is based on a wavelength of 587.6nm.
The classic structure of a doublet combines a positively powered crown element with a negatively powered flint element. They deliver high performance when the application involves small fields of view, typically up to 6 degrees. Their image quality surpasses that of singlets.
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