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TECHSPEC® MgF₂ 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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6.25mm Dia X -7.5mm Negative Doublet Lens FL MgF2 Coating

NT62-472

$45.00

Diameter (mm)	6.25
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-7.50
Back Focal Length BFL (mm)	-9.90
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-4.55
Radius R₂ (mm)	4.55
Radius R₃ (mm)	∞
Edge Thickness ET (mm)	4.98
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.00
Center Thickness CT 2 (mm)	3.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

6.25mm Dia X -10mm FL Negative Doublet Lens MgF2 Coating

NT62-473

$45.00

Diameter (mm)	6.25
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-10.00
Back Focal Length BFL (mm)	-11.92
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-6.55
Radius R₂ (mm)	5.10
Radius R₃ (mm)	89.10
Edge Thickness ET (mm)	4.19
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.00
Center Thickness CT 2 (mm)	2.50
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

6.25mm Dia X -12.5mm Negative Doublet Lens FL MgF2 Coating

NT45-420

$45.00

Diameter (mm)	6.25
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-12.50
Back Focal Length BFL (mm)	-12.89
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-24.66
Radius R₂ (mm)	4.24
Radius R₃ (mm)	11.25
Edge Thickness ET (mm)	3.52
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.00
Center Thickness CT 2 (mm)	2.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

6.25mm Dia X -25mm Negative Doublet Lens FL MgF2 Coating

NT45-421

$45.00

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Diameter (mm)	6.25
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-25.00
Back Focal Length BFL (mm)	-26.53
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-17.57
Radius R₂ (mm)	11.48
Radius R₃ (mm)	109.44
Edge Thickness ET (mm)	3.27
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.00
Center Thickness CT 2 (mm)	2.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

9mm Dia X -12mm FL Negative Doublet Lens MgF2 Coating

NT62-474

$45.00

Diameter (mm)	9.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-12.00
Back Focal Length BFL (mm)	-13.78
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-6.98
Radius R₂ (mm)	6.98
Radius R₃ (mm)	23.22
Edge Thickness ET (mm)	5.79
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.50
Center Thickness CT 2 (mm)	2.50
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Compliant

9mm Dia X -18mm FL Negative Doublet Lens MgF2 Coating

NT48-349

$45.00

Diameter (mm)	9.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-18.00
Back Focal Length BFL (mm)	-18.57
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-35.51
Radius R₂ (mm)	6.11
Radius R₃ (mm)	16.20
Edge Thickness ET (mm)	5.12
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	1.44
Center Thickness CT 2 (mm)	2.88
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Exempt

9mm Dia X -25mm FL Negative Doublet Lens MgF2 Coating

NT45-828

$45.00

Diameter (mm)	9.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	≥90% of Diameter
Effective Focal Length EFL (mm)	-25.00
Back Focal Length BFL (mm)	-27.33
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-17.75
Radius R₂ (mm)	12.17
Radius R₃ (mm)	109.75
Edge Thickness ET (mm)	5.13
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	2.55
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Exempt

12.5mm Dia X -15mm FL Negative Doublet Lens MgF2 Coating

NT48-350

$55.00

Diameter (mm)	12.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-15.00
Back Focal Length BFL (mm)	-18.08
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-10.62
Radius R₂ (mm)	8.63
Radius R₃ (mm)	81.12
Edge Thickness ET (mm)	8.04
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	4.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Exempt

12.5mm Dia X -20mm FL Negative Doublet Lens MgF2 Coating

NT62-475

$55.00

Diameter (mm)	12.50
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-20.00
Back Focal Length BFL (mm)	-22.88
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-13.80
Radius R₂ (mm)	9.99
Radius R₃ (mm)	109.48
Edge Thickness ET (mm)	7.01
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	3.50
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

12.5mm Dia X -25mm FL Negative Doublet Lens MgF2 Coating

NT45-219

$55.00

Diameter (mm)	12.50
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-25.00
Back Focal Length BFL (mm)	-27.33
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-17.75
Radius R₂ (mm)	12.17
Radius R₃ (mm)	109.75
Edge Thickness ET (mm)	5.74
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	2.55
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

12.5mm Dia X -35mm FL Negative Doublet Lens MgF2 Coating

NT45-424

$55.00

Diameter (mm)	12.50
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-35.00
Back Focal Length BFL (mm)	-36.51
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-21.66
Radius R₂ (mm)	17.48
Radius R₃ (mm)	50.54
Edge Thickness ET (mm)	4.74
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	1.56
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Compliant

12.5mm Dia X -50mm FL Negative Doublet Lens MgF2 Coating

NT45-220

$55.00

Diameter (mm)	12.50
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-50.00
Back Focal Length BFL (mm)	-51.58
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-30.83
Radius R₂ (mm)	23.47
Radius R₃ (mm)	69.20
Edge Thickness ET (mm)	4.40
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	1.56
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Compliant

12.5mm Dia X -75mm Negative Doublet Lens FL MgF2 Coating

NT47-016

$55.00

Diameter (mm)	12.50
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	11.50
Effective Focal Length EFL (mm)	-75.00
Back Focal Length BFL (mm)	-77.47
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-46.07
Radius R₂ (mm)	36.65
Radius R₃ (mm)	108.00
Edge Thickness ET (mm)	6.05
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.50
Center Thickness CT 2 (mm)	3.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Compliant

25mm Dia X -30mm FL Negative Doublet Lens MgF2 Coating

NT48-351

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-30.00
Back Focal Length BFL (mm)	-36.15
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-21.24
Radius R₂ (mm)	17.26
Radius R₃ (mm)	162.24
Edge Thickness ET (mm)	16.31
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	4.00
Center Thickness CT 2 (mm)	8.00
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Exempt

25mm Dia X -40mm FL Negative Doublet Lens MgF2 Coating

NT62-476

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-40.00
Back Focal Length BFL (mm)	-44.40
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-27.82
Radius R₂ (mm)	19.65
Radius R₃ (mm)	201.68
Edge Thickness ET (mm)	11.69
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	3.00
Center Thickness CT 2 (mm)	5.50
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

25mm Dia X -50mm FL Negative Doublet Lens MgF2 Coating

NT45-221

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-50.00
Back Focal Length BFL (mm)	-53.33
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-35.51
Radius R₂ (mm)	24.58
Radius R₃ (mm)	217.99
Edge Thickness ET (mm)	9.06
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.50
Center Thickness CT 2 (mm)	4.06
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

25mm Dia X -75mm FL Negative Doublet Lens MgF2 Coating

NT45-422

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-75.00
Back Focal Length BFL (mm)	-77.65
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-46.07
Radius R₂ (mm)	36.65
Radius R₃ (mm)	108.00
Edge Thickness ET (mm)	8.90
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.50
Center Thickness CT 2 (mm)	4.06
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Exempt

25mm Dia X -100mm FL Negative Doublet Lens MgF2 Coating

NT45-222

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-100.00
Back Focal Length BFL (mm)	-102.37
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-70.57
Radius R₂ (mm)	45.27
Radius R₃ (mm)	412.67
Edge Thickness ET (mm)	5.81
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.00
Center Thickness CT 2 (mm)	2.57
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

25mm Dia X -150mm FL Negative Doublet Lens MgF2 Coating

NT45-423

$75.00

Diameter (mm)	25.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	24.00
Effective Focal Length EFL (mm)	-150.00
Back Focal Length BFL (mm)	-152.63
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	-92.30
Radius R₂ (mm)	68.87
Radius R₃ (mm)	204.15
Edge Thickness ET (mm)	7.73
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	2.50
Center Thickness CT 2 (mm)	4.06
Centering (arcminutes)	3
Surface Quality	40-20
Bevel	0.25 x 45°
Substrate	N-BK7/N-SF5
Coating	MgF2
RoHS	Exempt

40mm Dia X -60mm FL Negative Doublet Lens MgF2 Coating

NT63-763

$95.00

Diameter (mm)	40.00
Diameter Tolerance (mm)	+0.0/-0.10
Clear Aperture CA (mm)	39.00
Effective Focal Length EFL (mm)	-60.00
Back Focal Length BFL (mm)	-67.12
Focal Length Tolerance (%)	±2
Radius R₁ (mm)	41.26
Radius R₂ (mm)	30.56
Radius R₃ (mm)	335.88
Edge Thickness ET (mm)	19.02
Center Thickness Tolerance (mm)	±0.2
Center Thickness CT 1 (mm)	5.00
Center Thickness CT 2 (mm)	8.50
Centering (arcminutes)	3
Surface Quality	60-40
Bevel	0.30 x 45°
Substrate	N-BaF10/N-SF10
Coating	MgF2
RoHS	Compliant

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TECHSPEC® MgF2 Coated Negative Achromatic Lenses

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TECHSPEC® MgF₂ Coated Negative Achromatic Lenses