25.4 mm dia x 250 mm FL, SLAR - Frontier Optics Online Store

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Home > Lenses > Achromats > 25.4 mm dia x 250 mm FL, SLAR

25.4 mm dia x 250 mm FL, SLAR

Sku: 01AC254-250-SL

$65.00

Specifications of 25.4 mm dia x 250 mm FL, SLAR

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;
AR Coating	BBAR: Ravg <0.5%, Rmax <1.5% per surface, 430–700 nm
Operating Temperature	-40 °C to 85 °C

Achromatic