Compare Model Drawings, CAD & Specs Availability Price
Microscope Objective Lens, 5x, 0.10 NA, 25.4 mm Focal Length
In Stock
In Stock
Microscope Objective Lens, 10x, 0.25 NA, 16.5 mm Focal Length
In Stock
In Stock
Microscope Objective Lens, 20x, 0.40 NA, 9.0 mm Focal Length
In Stock
In Stock



Finite Conjugate Objective Selection

Our M- microscope objectives are corrected for a rear conjugate at 160 mm, and this family is the most popular family in the microscope objective offering. The M- series is currently available in a range of powers from 5x to 20x.  If cost is an issue, the MV- series is the economical choice for standard laboratory applications.  Please see Economy Microscope Objective Lenses.

Ideal for Spatial Filtering

Our microscope objectives are broadband AR coated and designed for diffraction limited performance across the entire visible spectrum. This allows collimated beams from lasers such as HeNe, Argon, or frequency double Nd:YAG to be focused to a small spot for spatial filtering. In spatial filtering, a laser source is focused to a diffraction limited airy disk spot pattern. A pinhole is placed at the focal plane sized such that only the central lobe of the airy disk may pass through. This removes undesired higher spatial frequencies to produce a clean uniform output beam. Please see our Three-Axis Spatial Filters and our space-saving Compact Five-Axis Spatial Filters.

Spatial Filter Lens & Pinhole Selection*

Objective Lens Recommended Max Input Beam Diameter Calculated Pinhole Diameter* Recommended Pinhole Diameter Recommended Pinhole
M-5X 5.0 mm 32.2 µm 50 µm 900PH-50
M-10X 5.5 mm 20.9 µm 25 µm 900PH-25
M-20X 5.0 mm 11.4 µm 15 µm 900PH-15
* For 1 mm diameter beam at 632.8 mm. For a tutorial, check out Fundamentals of Spatial Filtering.

High Power Laser Application Example

The M-20X is highlighted here in a laser engraving example. This example highlights the fact that these objectives can be used without issue. Unfortunately there is no specific data for actual laser damage. For any high power application, due to the sensitive nature of the environment, the level of cleanliness, and laser power homogeneity, the objectives cannot be guaranteed to perform without damage.