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MgF₂ Coated Negative Achromatic Lenses

MgF<sub>2</sub> Coated Negative Achromatic Lenses

Consisting of two optical elements cemented together, negative doublet lenses are corrected for color and on-axis aberrations. Used predominantly as Barlow lenses to extend focal lengths, they are often combined with positive achromatic mirror systems and imaging lenses.

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40mm Dia X -80mm FL Negative Doublet Lens MgF2 Coating

#63-764

$115.00

Diameter (mm)	40.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	39.00
Effective Focal Length EFL (mm)	-80.0
Back Focal Length BFL (mm)	-84.47
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-47.32
Radius R₂ (mm)	40.51
Radius R₃ (mm)	128.26
Edge Thickness ET (mm)	16.26
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	4.00
Center Thickness CT 2 (mm)	6.50
Centering (arcminutes)	3
Surface Quality	60-40
Bevel	0.30 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF₂: ¼λ @ 550nm, R_avg ≤1.75% @ 400 - 700nm
RoHS	Compliant

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40mm Dia X -100mm FL Negative Doublet Lens MgF2 Coating

#63-765

$115.00

Diameter (mm)	40.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	39.00
Effective Focal Length EFL (mm)	-100.0
Back Focal Length BFL (mm)	-104.33
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-60.11
Radius R₂ (mm)	48.43
Radius R₃ (mm)	149.50
Edge Thickness ET (mm)	15.08
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	4.00
Center Thickness CT 2 (mm)	6.50
Centering (arcminutes)	3
Surface Quality	60-40
Bevel	0.30 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF₂: ¼λ @ 550nm, R_avg ≤1.75% @ 400 - 700nm
RoHS	Compliant

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40mm Dia X -120mm FL Negative Doublet Lens MgF2 Coating

#63-766

$115.00

Diameter (mm)	40.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	39.00
Effective Focal Length EFL (mm)	-120.0
Back Focal Length BFL (mm)	-124.27
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-72.65
Radius R₂ (mm)	56.77
Radius R₃ (mm)	173.40
Edge Thickness ET (mm)	14.31
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	4.00
Center Thickness CT 2 (mm)	6.50
Centering (arcminutes)	3
Surface Quality	60-40
Bevel	0.30 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF₂: ¼λ @ 550nm, R_avg ≤1.75% @ 400 - 700nm
RoHS	Compliant

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40mm Dia X -150mm FL Negative Doublet Lens MgF2 Coating

#63-767

$115.00

Diameter (mm)	40.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	39.00
Effective Focal Length EFL (mm)	-150.0
Back Focal Length BFL (mm)	-154.22
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-91.23
Radius R₂ (mm)	69.66
Radius R₃ (mm)	211.28
Edge Thickness ET (mm)	13.54
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	4.00
Center Thickness CT 2 (mm)	6.50
Centering (arcminutes)	3
Surface Quality	60-40
Bevel	0.30 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF₂: ¼λ @ 550nm, R_avg ≤1.75% @ 400 - 700nm
RoHS	Compliant

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