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Diameter (mm) : 50.80 mm X
Focal Length (mm) : 250.00 mm X
Price : $20.00 and above X
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Achromats
Achromatic Lenses Specifications
   
Focal Length Tolerance ±2 %
Material Optical crown and flint glasses or equivalent
Design Wavelengths 486.1, 546.1, and 656.3 nm
Surface Accuracy 1.5 λ (1.5 λ) power, (λ/4) irregularity at 632.8 nm over the clear aperture
Clear Aperture ≥central 90% of diameter
Surface Quality 40-20 scratch-dig
Centration ≤3 arc min
Diameter Tolerance +0/-0.1 mm
Center Thickness (Tc = Tc1 + Tc2) Tolerance ±0.2 mm for lenses <50.8 mm diameter
±0.4 mm for lenses ≥50.8 mm diameter
Edge Thickness (Te) Tolerance Nominal Value
AR Coating SLAR (Single-layer MgF2): Ravg <1.5%, Rmax <2.5% per surface, 400–700 nm;
BBAR: Ravg <0.5%, Rmax <1.5% per surface, 430–700 nm
Operating Temperature  -40 °C to 85 °C

Achromatic
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Part Number (SKU) Description Price  
01AC508-250-BB
50.8 mm dia x 250 mm FL, BBAR
$108.00
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