Senior Research Microscope (Plan Objectives)

Quick Answer: The Senior Research Microscope (Plan Objectives) is an advanced compound microscope fitted with plan objectives, which give a flat image that is sharp from the centre to the edge of the field. The senior research microscope serves histology, pathology teaching and slide documentation.

Flat-Field Viewing in Practice

A slide scanned with non-plan objectives shows a subtle but tiring effect: focus the centre and the edges soften; focus the edges and the centre drifts. Over hundreds of fields, users keep nudging the fine focus. Plan objectives remove most of that curvature, so a histology student can take in a whole field of a kidney section at once, and a technician counting cells in a grid can trust the corners as much as the middle.

The difference shows most clearly in photographs. A camera sensor is flat, and an image formed on a curved surface cannot be sharp across all of it at once, so plan correction matters for anyone recording images for reports, theses or lecture slides.

This listing names plan objectives but not infinity correction. LabEquip lists an infinity plan version as well; if you already own finite-tube objectives or accessories, find out which optical system this model uses so that spares match.

Applications

• Histology and histopathology teaching slide sets
• Counting in a haemocytometer or Sedgewick-Rafter chamber
• Recording images for theses, reports and lecture material
• Measuring cell and tissue dimensions in plant anatomy sections

Specifications

Care & Handling

• Clean the small front lenses of high-power plan objectives with a cotton swab lightly moistened with lens-cleaning fluid rather than pressing tissue in with a fingertip.
• Keep each set of objectives on its own senior research microscope; swapping them between stands can upset parfocality, so that focus shifts when the nosepiece is turned.
• Stand the microscope on a solid bench away from centrifuges, fridges and doors that slam.
• Use a dust cover and keep humidity low in the room where it is stored.

Why Choose LabEquip

Histopathology teaching departments, research laboratories and colleges running postgraduate microscopy buy the plan-objective senior model. It is part of the LabEquip Microscope & Optics range; send your slide types and any camera plans through the contact page.

Frequently Asked Questions

What is the advantage of plan objectives over achromats?

Standard achromats bring the centre of the field into sharp focus while the edges fall slightly out; plan objectives are corrected so the whole field is sharp at one setting. This saves refocusing and gives evenly sharp photographs.

Are plan objectives necessary for students?

For introductory practicals, no. They pay off in work that uses the whole field at once: counting, measuring, photography and long scanning sessions.

Does this model have infinity-corrected optics?

The listing names plan objectives only. A separate infinity plan senior model exists, so ask which system this one uses if objectives or accessories must match equipment you already own.

How do I count cells in a haemocytometer?

Load the chamber by capillary action under its coverslip, focus on the ruled grid at low power, then count cells in the specified squares, including those touching two agreed borders and excluding the other two. Multiply by the chamber factor and dilution to get cells per millilitre.

Why should the microscope stand on a firm bench?

At high power, small vibrations from a centrifuge, a fridge compressor or foot traffic blur the image and make photographs soft. A solid bench away from such equipment keeps the image still.

How should high-power plan objectives be cleaned?

Blow off dust first. Then wipe the front lens gently with a swab lightly moistened with lens-cleaning fluid, turning it in a spiral from the centre outwards, and finish with a dry swab. Avoid aggressive solvents, which can soften the cement between lens elements.

Last Updated: September 2026