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Parfocal Length 60mm Plan Infinite Biological Objective

Parfocal Length 60mm Plan Infinite Biological Objective

The 60mm parfocal length plan infinite biological objective series from Nanjing AMADA Instrument is designed for consistent focus across magnifications in biological microscopy applications. Each objective maintains a 60mm parfocal distance, ensuring minimal refocusing when switching between magnifications. The series includes 4X to 100X models with plan infinite optical design, offering high image flatness and compatibility with modern microscopes equipped with infinity-corrected systems.

  • 60mm parfocal length ensures consistent focus when changing objectives
  • Plan infinite design delivers flat, high-contrast images across the field of view
  • Available in 4X to 100X magnifications with NA values from 0.15 to 1.3
  • Semiapochromat correction for 20X, 40X, 60X, and 100X models reduces chromatic and spherical aberrations
  • Standard field of view of 25 mm (FN25) across all models for consistent field coverage
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Technical features

  • Parfocal length: 60 mm for all models
  • Optical design: Plan infinite
  • Magnification: 4X, 10X, 20X, 40X, 60X, 100X
  • Numerical aperture (NA): 0.15 (4X), 0.25 (10X), 0.45 (20X), 0.7 (40X), 0.85 (60X), 1.3 (100X)
  • Working distance (WD): 16.2 mm (4X), 9.6 mm (10X), 2.85 mm (20X), 0.55 mm (40X), 0.65 mm (60X), 0.22 mm (100X)
  • Field of view: 25 mm (FN25) for all models
  • Correction: Semiapochromat for 20X, 40X, 60X, and 100X; standard plan for 4X and 10X

Who it is for

  • Clinical laboratories performing routine histology and cytology
  • Biomedical researchers using biological microscopes with infinity optics
  • Microscopy equipment integrators building inspection systems
  • Distributors sourcing standardized objectives for biological microscope kits

Specifications

Model4X / 10X / 20X / 40X / 60X / 100X
Parfocal Length60mm
Optical DesignPlan Infinite
Numerical Aperture0.15 (4X), 0.25 (10X), 0.45 (20X), 0.7 (40X), 0.85 (60X), 1.3 (100X)
Working Distance16.2 mm (4X), 9.6 mm (10X), 2.85 mm (20X), 0.55 mm (40X), 0.65 mm (60X), 0.22 mm (100X)
Field of View25 mm (FN25) for all models
Correction TypeSemiapochromat (20X–100X), Plan (4X–10X)

Use guide

  • Select objective based on required magnification, NA, and working distance for the specimen
  • Use 4X or 10X objectives for large samples or low-magnification overviews
  • Use 20X–100X objectives for detailed cellular or subcellular analysis with proper immersion oil for 100X
  • Ensure microscope is infinity-corrected to fully utilize plan infinite design

FAQ

What is the parfocal length of this objective series?
60mm for all models, ensuring consistent focus when switching between objectives.
Are these objectives compatible with infinity-corrected microscopes?
Yes. The plan infinite design is specifically for use with infinity-corrected microscopes.
Do the 20X and above objectives have semiapochromat correction?
Yes. 20X, 40X, 60X, and 100X models are semiapochromat corrected to reduce optical aberrations.
What is the field of view for each objective?
All models have a field of view of 25 mm (FN25).
Is immersion oil required for the 100X objective?
Yes. The 100X objective requires immersion oil for optimal performance and NA of 1.3.

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