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25.4 mm dia x 250 mm FL, BBAR
25.4 mm dia x 250 mm FL, BBAR
Sku:
01AC254-250-BB
$73.00
Specifications of 25.4 mm dia x 250 mm FL, BBAR
Diameter (mm) :
25.40 mm
Focal Length (mm) :
250.00 mm
R1 :
152.037 mm
R2=R3 :
-112.215 mm
R4 :
-336.199 mm
Tc1 :
3.80 mm
Tc2 :
2.50 mm
Tc :
6.30 mm
Te :
5.50 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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