APQ 150/1200 Fluorite Quadruplet Polychromat

Comparison between APQ 150/1200 Polychromat and Carl Zeiss APQ 150/1200 Apochromat: Strehl Ratio vs. Wavelength (365 nm – 1014 nm)

The APQ 150/1200 Fluorite Quadruplet Polychromat shows no drop in Strehl ratio toward or below the diffraction limit at the edges of the visual spectrum, unlike most apochromats.

Due to its polychromatic correction, the 150/1200 CaF₂ Quadruplet is able to exploit the full UBVRI spectral range (365 nm – 1014 nm) of modern electronic sensors (CCD, CMOS).

We source specially specified, high-quality fluorite blanks from a certified manufacturer that also supplies CaF₂ raw material to leading precision-optics companies for stepper lenses used in VUV photolithography.

The surfaces of the objective lenses, made from three different special optical glasses from SCHOTT^® or OHARA^® and CaF₂, are precision machined; one lens surface is aspheric.

Because every manufacturing process has finite precision, even state-of-the-art CNC machining is subject to tolerances. All manufacturing parameters must therefore be carefully specified and toleranced.

The required high image quality is achieved by a final system correction performed by a master optician with decades of experience.

Thanks to a novel compensation cell, the elements of the fully oil-spaced objective (without air gaps) remain securely positioned as temperature changes.

The optical system reaches thermal equilibrium quickly, while the cell prevents element movement and the associated adverse effects.