APQ 110/550 Fluorite Wide Field Polychromat
UBVRI Fluorite Wide Field Polychromat
Ten-lens aspherical design
3 lenses from CaF₂
Final system correction by a master optician
Oil-spaced with air gaps
Ultra-broadband anti-reflection coating
Compensation cell
Adjustable optical system
Integrated special focal reducer corrector
Retractable and lockable dew cap
Feather Touch Focuser FTF3545
Ø67.4mm non-vignetted image field suitable for full-frame, IMX461 and IMX411 CMOS cameras
Compact travel-ready dimensions
Outstanding imaging performance for astronomy and nature observation – setting a new benchmark in its class
excl. shipping costs
incl. 19% VAT
excl. shipping costs
excl. shipping costs
excl. shipping costs
APQ Optical System 110/550 WF Polychromat with optical inspection certificate
APQ Tube Assembly 110/550
APQ Dust-cover for dew cap
Feather Touch Focuser FTF3545
APQ Quick Changer S88
APQ Dust-cover for Quick Changer
incl. 19% VAT
excl. shipping costs
excl. shipping costs
excl. shipping costs
excl. shipping costs
- Description
- Specification
- Recommended Accessories
- Applications
- Downloads
The APQ 110/550 Fluorite Wide Field 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 ten-lens CaF₂ optical system of the APQ 110/550 achieves the maximum possible resolution out to the edge of the non-vignetted Ø67.4mm image field (IMX411 image diagonal: 66.7mm), while utilizing the full UBVRI spectral range (365nm – 1014nm) of modern electronic sensors (CCD, CMOS).
The RMS spot size is well within the diameter of the Airy disc for all wavelengths in the entire spectral range from 365nm to 1014nm, even at the edge of the image field of Ø67.4mm.
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 optical elements, 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 oil-spaced optical system with air gaps remain securely positioned as the temperature changes.
The optical system reaches thermal equilibrium quickly, while the cell prevents lens rattle and its associated adverse effects.
The optical system 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 dew cap, with more than 100mm of travel and lockable in any position, is designed for the Wide Field Polychromat's maximum 7° field. The dew cap carries the designation WF Polychromat 110/550, 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 S88 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 WF Polychromat a unique appearance with strong brand recognition.
The APQ 110/550 Fluorite Wide Field Polychromat is a premium refractor ideally suited to all types of observation – visual and photographic.
(theoretical)
(theoretical)
(theoretical)
(theoretical)
(theoretical)
(exit pupil 6mm – 0.33mm)
(individual colors such as cream white or black velvet are possible by arrangement)
(dew cap and focuser retracted / extended)
