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E-67-422 25 x 50mm EFL Steinheil Triplet Achromatic Lens

Fosco Connect Part No.: E-67422

  • $ 211.00 or



E-67422 25 x 50mm EFL Steinheil Triplet Achromatic Lens

Product MGF2 Coating Curve

Product ISO

Product Drawing

Diameter (mm): 25.00 +0.0/-0.025
Effective Focal Length EFL (mm): 50.00
Focal Length Tolerance (%): ±1
Back Focal Length BFL (mm): 40.60
Focal Length Specification Wavelength (nm): 587.6
Centering (arcmin): <3
Center Thickness CT (mm): 25.80
Center Thickness A (mm): 13.00
Center Thickness B (mm): 6.40
Center Thickness Tolerance (mm): ±0.3
Radius R1 (mm): 31.25
Radius R2 (mm): 18.47
Radius R3 (mm): -18.47
Radius R4 (mm): -31.25
Edge Thickness ET (mm): 20.58
Substrate: 
Surface Quality: 40-20
f/#: 2.00
Numerical Aperture NA: 0.25
Coating: MgF2 (400-700nm)
Coating Specification: Ravg ≤1.75% @ 400 - 700nm
Power (P-V) @ 632.8nm: 1.5λ
Irregularity (P-V) @ 632.8nm: λ/4
Bevel: Protective bevel as needed
Type: Achromatic Triplet Lens
Wavelength Range (nm): 400 - 700

Product Family Description

  • Designed for 1:1 Conjugate Ratios
  • Ideal for Relay Systems

TECHSPEC® Steinheil Triplet Achromatic Lenses are designed for 1:1 conjugate ratios and utilize symmetry to correct for aberrations. Steinheils are made from a low index center element cemented between two identical high index outer elements. Each lens is edged down to f-numbers with reasonable aberration correction at increased fields. TECHSPEC® Steinheil Triplet Achromatic Lenses feature small diameters that allow for mounting in smaller spaces compared to traditional Steinheil lens designs. Steinheil Triplets are ideal for use in relay systems.

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