APQ 100/640 Fluorite Quadruplet Polychromat

Comparison between APQ 100/640 Polychromat and Carl Zeiss APQ 100/640 Apochromat: Strehl Ratio vs. Wavelength (365 nm – 1014 nm)

The Fluorite Quadruplet Polychromat 100/640 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 100/640 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.