APQ 180/1440 Fluorite Quadruplet Polychromat
UBVRI Fluorite Quadruplet Polychromat
Four-lens aspherical design
Final system correction by a master optician
CaF₂ lens protected between glass lenses
Oil-spaced without air gaps
Ultra-broadband anti-reflection coating
Objective in compensation cell
Objective adjustable
Retractable and lockable dew cap
Feather Touch Focuser FTF3545
Depending on the observation task, the basic system is combined with the field corrector or focal reducer corrector
Premium refractor ideally suited to all types of observation
excl. shipping costs
incl. 19% VAT
excl. shipping costs
excl. shipping costs
excl. shipping costs
APQ Objective 180/1440 Polychromat with optical inspection certificate
APQ Tube Assembly 180/1440
APQ Dust-cover for dew cap
Feather Touch Focuser FTF3545
APQ Quick Changer S108
APQ Dust-cover for Quick Changer
- Description
- Specification
- Recommended Accessories
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The Fluorite Quadruplet Polychromat 180/1440 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 180/1440 CaF₂ Quadruplet is the first astronomical optical system to exploit the full UBVRI spectral range (365nm – 1014nm) 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 lens rattle and its associated adverse effects.
The objective can be adjusted precisely to the optical axis of the OTA.
The CNC precision machining of lens cell, dew cap and telescope tube ensures the required high centering accuracy.
Inside the OTA, a defined surface structure and a diaphragm system in combination with an antireflective coating of all internal surfaces effectively prevent the occurrence of scattered light and tube reflections.
The over 190mm sliding dew cap, which can be clamped in any position, takes into account the maximum image field diameter of the field corrector and focal reducer corrector of 3.5° each. The dew cap carries the designation Polychromat 180/1440, the APQ brand logo and the country-of-origin marking Made in Germany.
At the end of the refractor, the Feather Touch focuser FTF3545 from Starlight Instruments is mounted with an APQ Quick Changer with the S108 dovetail ring system for coupling adapters and components.
The Feather Touch focuser is rotatable by 360°, so that it can always be turned into the desired position. The dual-speed mechanism with coarse and fine drive has a reduction ratio of 10:1.
The distinctive color of the OTA stands out from the conventional white finish and gives the APQ Polychromat a unique appearance with strong brand recognition.
The APQ 180/1440 Fluorite Quadruplet Polychromat is a premium refractor ideally suited to all types of observation – visual and photographic.
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(exit pupil 6mm – 0.33mm)
(individual colors such as cream white or black velvet are possible by arrangement)
(dew cap and focuser retracted / extended)
