Nanjing AMADA Instrument Co., Ltd. · Nanjing, China [email protected] · +86-15195807515
AMADA Microscopes Request A Quote
Home Products Biological MicroscopeZoom Stereo MicroscopeFluorescence MicroscopeMetallurgical MicroscopePolarizing MicroscopeVideo Digital MicroscopeMicroscope CameraAstronomy AccessoryMicroscope AccessoryMagnifier Knowledge About Contact Request A Quote
Home / Products / Microscope Objective / Parfocal Length 45mm Plan Infinite Biolo
Parfocal Length 45mm Plan Infinite Biological Objective

Parfocal Length 45mm Plan Infinite Biological Objective

The Parfocal Length 45mm Plan Infinite Biological Objective is a series of high-precision microscope objectives designed for biological and biomedical applications. Each objective features a 45mm parfocal length, plan infinite optical design, and consistent focus across magnifications. Available in magnifications from 4X to 100X with varying numerical apertures and working distances, the series supports clear, flat-field imaging with high resolution and contrast for routine and advanced microscopy tasks.

  • 45mm parfocal length ensures consistent focus when switching between objectives
  • Plan infinite design delivers flat, high-contrast images across the entire field of view
  • Available in 4X to 100X magnifications with optimized NA and working distances for specific applications
  • Semiapochromat and LWD variants improve color correction and allow closer approach to specimens
  • Standard 25 mm field of view (FN) ensures compatibility with common eyepieces and cameras
Request A Quote +86-15195807515

Technical features

  • Parfocal length: 45mm for all models
  • Optical design: Plan infinite
  • Field of view: 25 mm (FN) across all models
  • 4X: NA 0.1, WD 16.15 mm
  • 10X: NA 0.25, WD 9.57 mm
  • 20X: Semiapochromat, NA 0.45, WD 2.8 mm
  • 40X: Semiapochromat, NA 0.7, WD 0.55 mm
  • 40X LWD: Semiapochromat, NA 0.7, WD 1.8 mm

Who it is for

  • Clinical pathology labs and diagnostic centers
  • Biomedical research institutions and university labs
  • Microscopy equipment integrators building complete biological microscope systems
  • Importers sourcing standardized, interchangeable objectives for global distribution

Specifications

Model4X
NA0.1
Working Distance16.15 mm
Field of View25 mm
Parfocal Length45mm
Model10X
NA0.25
Working Distance9.57 mm
Field of View25 mm
Parfocal Length45mm
Model20X
TypeSemiapochromat
NA0.45
Working Distance2.8 mm
Field of View25 mm
Parfocal Length45mm
Model40X
TypeSemiapochromat
NA0.7
Working Distance0.55 mm
Field of View25 mm
Parfocal Length45mm
Model40X LWD
TypeSemiapochromat
NA0.7
Working Distance1.8 mm
Field of View25 mm
Parfocal Length45mm
Model60X
NA0.85
Working Distance0.65 mm
Field of View25 mm
Parfocal Length45mm
Model100X
NA1.25
Working Distance0.22 mm
Field of View25 mm
Parfocal Length45mm

Use guide

  • Select objective based on required magnification, NA, and working distance for specimen type
  • Use 40X LWD when working with thicker samples or limited space under the objective
  • Use 100X only with immersion oil and proper oil immersion microscope stage
  • Ensure the microscope body supports infinite tube length and plan objectives for full field flatness

FAQ

What is the parfocal length of these objectives?
All objectives in this series have a 45mm parfocal length.
Are these objectives compatible with standard biological microscopes?
Yes, they are designed for plan infinite biological microscopes with 45mm parfocal length.
Do these objectives require immersion oil?
Only the 100X objective requires immersion oil for proper operation.
What is the field of view for each objective?
All models have a 25 mm field of view (FN).
Can I use the 40X LWD objective instead of the standard 40X?
Yes, if you need greater working distance; it is designed for specimens with limited clearance or thicker samples.

Related products

Related knowledge