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What is the difference between achromatic, semi-plan and plan objectives?

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What is the difference between achromatic, semi-plan and plan objectives?
What is the difference between achromatic, semi-plan and plan objectives?

Most microscope objectives come in three basic designs: achromatic, semi-plan and plan.

An achromatic objective corrects for color and has a flat field across the central 65% of the image. It’s usually a pair of lenses.

Semi-plan (semi-planar, sometimes called micro-plan) objectives have an 80% flat field. They can either be two lens element achromats or three or more element apochromats. 

A plan (or planar) objective corrects better for color and spherical aberration than either the semi-plan or the achromatic objective. Plan objectives have a flat field about the center 95% of the image. They also often have larger working distances. While plan objectives give you flatter fields than achromatic objectives, they also are the most expensive. 

Pub Time : 2014-08-25 21:17:29 >> News list
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