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50.8 mm dia x 250 mm FL, BBAR
50.8 mm dia x 250 mm FL, BBAR
Sku:
01AC508-250-BB
$108.00
Specifications of 50.8 mm dia x 250 mm FL, BBAR
Diameter (mm) :
50.80 mm
Focal Length (mm) :
250.00 mm
R1 :
151.578 mm
R2=R3 :
-112.149 mm
R4 :
-335.971 mm
Tc1 :
8.50 mm
Tc2 :
4.33 mm
Tc :
12.83 mm
Te :
9.70 mm
Glass :
N-BK7 & N-SF5
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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 ? (1.5 ?) power, (?/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
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