TECHSPEC® Hastings Triplet Achromats

Hastings Triplets are the most popular high-power magnifiers available today, because their unique three-element design provides the ultimate in distortion-free, color-correct viewing. The lenses in this series are computer-designed to interact with each other, contributing to the reduction or elimination of “pincushion” distortion and chromatic and spherical aberrations. The triple lens system is made up of two concave meniscus elements cemented to a double convex lens. AR Coated, 1/4 wave MgF2. All dimensions are in mm.

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Description Stock No. Price In Stock  
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12.5mm Dia x 20mm EFL Hastings Triplet Achromat Lens
NT45-251 $59.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 12.50
Effective Focal Length EFL (mm) 20.00
Back Focal Length BFL (mm) 16.31
Center Thickness CT (mm) 10.18
Center Thickness A (mm) 7.98
Center Thickness B (mm) 1.10
Edge Thickness ET (mm) 7.44
Radius R1 (mm) 14.95
Radius R2 (mm) 7.34
Radius R3 (mm) -7.34
Radius R4 (mm) -14.95
Substrate A N-BK7
Substrate B N-F2
Surface Quality 60-40
Coating AR Coated 1/4wave MgF2
Design Wavelength DWL (nm) 587.6
Diameter Tolerance (mm) +0.0/-0.1
Center Thickness Tolerance (mm) ±0.3
Bevel 0.25mm x 45°
Focal Length Tolerance (%) ±2
RoHS Compliant
15mm Dia x 25.4mm EFL Hastings Triplet Achromat Lens
NT30-120 $59.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 15.01
Effective Focal Length EFL (mm) 25.40
Back Focal Length BFL (mm) 20.00
Center Thickness CT (mm) 12.49
Center Thickness A (mm) 10.21
Center Thickness B (mm) 1.14
Edge Thickness ET (mm) 9.41
Radius R1 (mm) 19.00
Radius R2 (mm) 9.30
Radius R3 (mm) -9.30
Radius R4 (mm) -19.00
Substrate A N-BK7
Substrate B N-F2
Surface Quality 60-40
Coating AR Coated 1/4wave MgF2
Design Wavelength DWL (nm) 587.6
Diameter Tolerance (mm) +0.0/-0.1
Center Thickness Tolerance (mm) ±0.3
Bevel 0.25mm x 45°
Focal Length Tolerance (%) ±2
RoHS Exempt
23mm Dia x 40.3mm EFL Hastings Triplet Achromat Lens
NT30-229 $59.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 23.00
Effective Focal Length EFL (mm) 40.30
Back Focal Length BFL (mm) 33.90
Center Thickness CT (mm) 18.00
Center Thickness A (mm) 11.00
Center Thickness B (mm) 3.50
Edge Thickness ET (mm) 13.79
Radius R1 (mm) 32.48
Radius R2 (mm) 18.15
Radius R3 (mm) -18.15
Radius R4 (mm) -32.48
Substrate A N-BK7
Substrate B N-F2
Surface Quality 60-40
Coating AR Coated 1/4wave MgF2
Design Wavelength DWL (nm) 587.6
Diameter Tolerance (mm) +0.0/-0.1
Center Thickness Tolerance (mm) ±0.3
Bevel 0.25mm x 45°
Focal Length Tolerance (%) ±2
RoHS Compliant
8mm Dia x 12.5mm EFL Hastings Triplet Achromat Lens
NT36-187 $69.00 In stock and ready to ship. Click to add this item to your cart.
Diameter (mm) 8.00
Effective Focal Length EFL (mm) 12.50
Back Focal Length BFL (mm) 9.90
Center Thickness CT (mm) 7.18
Center Thickness A (mm) 5.40
Center Thickness B (mm) 0.89
Edge Thickness ET (mm) 5.41
Radius R1 (mm) 9.48
Radius R2 (mm) 4.66
Radius R3 (mm) -4.66
Radius R4 (mm) -9.48
Substrate A N-K5
Substrate B N-F2
Surface Quality 60-40
Coating AR Coated 1/4wave MgF2
Design Wavelength DWL (nm) 587.6
Diameter Tolerance (mm) +0.0/-0.1
Center Thickness Tolerance (mm) ±0.3
Bevel 0.25mm x 45°
Focal Length Tolerance (%) ±2
RoHS Compliant
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