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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.
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.