A microscope objective refers to the lens(es) closest to the object in a microscope. The term microscope objective is often used interchangeably with objective lens, or known simply as an objective. The objective works with the tube lens and/or eyepiece to project the image of the subject into an image sensor or the viewer’s eye, respectively.
Microscope objectives are typically a complex assembly of lenses, often made of glass. The lens design is crucial to correcting against blurriness, color distortion, or other aberration through lens curvature, spacing, glass type, and other adjustments.
Beyond magnification, objective lenses are classified by their Numerical Aperture (NA), and Working Distance. Numerical Aperture describes the light-capturing capabilities of the objective. The higher the NA, the more light it collects and the dimmer the sample can be, while working distance describes how far the sample sits from the front of the objective. Some custom objectives will also list the tube length and focal length on the housing for easy distinction.
Objectives with infinite tube length are referred to as ‘infinity corrected’ and project an unfocused beam of light out their back side. With the help of a tube lens, this light can be focused onto a sensor. Objectives with finite tube lengths are referred to as “finite conjugate” and can create a focus image without the need for a tube lens. Finite conjugate objectives are the type used in visual microscope systems.
Product designers choose the Optikos Engineering Services team to develop the lenses and mechanical components necessary for their unique applications. If their needs fall within certain parameters, these customers may even be able to utilize Optikos pre-engineered solutions. By using these objectives as a design starting point, you can accelerate your development cycle and reduce non-recurring engineering charges. Our team of optical and opto-mechanical engineering specialists balance all system requirements to select the best starting point (objective) for your application. These experts then fine-tune the design to perfectly fit your needs and quickly transition to manufacturing.
Ready to discuss the scope of your project and learn how Optikos can kickstart development? Contact sales@optikos.com.
