Objective Lens Comparison

Objective Lenses: 
Achromatic vs Semi-Plan vs Plan 

Besides some special microscope objective lenses, there are three kinds of objective lenses on the market.
Achromatic, semi-plan, and plan. 

Achromatic Lens:

Semi-Plan Lens:

Plan Lens: 

 

First of all, all these three objective lenses correct for color, although there's no "achromatic" in the name of "semi-plan" or "plan". The difference between these three lenses is the focusing area which can be seen from the eyepieces when using high power objective lenses such as 40x, 60x and 100x. 

The difference from low power lenses are not obvious, which means that can be ignored. At high power, an achromatic lens has about 65% of focused area acrossing the center. A semi-plan one has about 85% whereas the plan one has 95%. 

 Due to the correction from the different lenses, the price for those lenses are also different. Here are some links for the objective lenses: 

Achromatic: http://www.microscopenet.com/achromatic-objective-lenses-compound-microscopes-p-377.html 
Semi-Plan: http://www.microscopenet.com/semi-plan-achromatic-objective-compound-microscopes-p-317.html
Plan: http://www.microscopenet.com/plan-achromatic-objective-compound-microscopes-p-316.html

Objectives

The following is a list of descriptions of the various types of objectives available for your microscope.

 Achromat Objectives - these are the most basic high power microscope objectives. Typically the outer edge of the circular image seen through the microscope will be slightly out of focus due to the curvature of the lens.

Semi-Plan Achromat Objectives - these are one step up from basic microscope objectives in that the field of viewhas been corrected a bit and the outer edges will be in focus more than the standard achromat lens.

Plan Achromat Objectives - these microscope objectives have been corrected for lens curvature and the entire image plane is flat and in focus

Plan Apochromat Objectives - These objectives have been corrected for four colors chromatically and spherically. Best used for critical resolution and color photomicrography.

Plan Fluorite Objectives - these microscope objective lenses are corrected for four wavelengths, but not quite as extensively as plan apochromat objectives.

100 X Achromatic Compound Microscope Objective Lens $69.99
Shop here: http://bit.ly/130Jfs8http://bit.ly/130Jfs8

Shop Objectives: http://www.microscopenet.com/microscope-accessories-objectives-c-89_53.html