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APQ 180/1440 Fluorite Quadruplet Polychromat
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APQ 180/1440 Fluorite Quadruplet Polychromat
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APQ 180/1440 Fluorite Quadruplet Polychromat
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APQ 180/1440 Fluorite Quadruplet Polychromat

APQ 180/1440 Fluorite Quadruplet Polychromat

UBVRI Fluorite Quadruplet Polychromat
Four lens aspherical design
System correction by precision optics master
CaF₂ lens protected between glass lenses
Oil spaced without air gaps
Ultra broad band antireflection coating
Objective in compensation cell
Objective adjustable
Rectractable 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 that is predestined for all types of observations

Price
valid until  
on request
incl. 19% VAT
excl. shipping costs

Price valid from  
 
incl. 19% VAT
excl. shipping costs

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Delivery time
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  • Description
  • Specification
  • Recommended Accessories
  • Applications
  • Downloads

The Fluorite Quadruplet Polychromat 180/1440 does not show any decrease of the Strehl ratio near or below the diffraction limit in the peripheral regions of the visual spectrum, as is the case with most apochromats.

Due to its polychromatic correction, the 180/1440 CaF₂ Quadruplet is the first astronomical optics that exploit the full UBVRI spectral range (365nm – 1014nm) of modern electronic sensors (CCD, CMOS).

We source the high-quality fluorite blanks with special parameters in selected quality from a certified manufacturer, which also supplies the global players of precision optical equipment with CaF₂ raw material for the production of stepper lenses for VUV photolithography.

The surfaces of the objective lenses made of three different special optical glasses of SCHOTT® or OHARA® and CaF₂ are precision machined, a lens surface is an asphere.

Because every fabrication can only be done with finite precision, even the latest technologies and state-of-the-art CNC precision machining processes are subject to errors. All manufacturing parameters must therefore be tolerated conscientiously.

The required high image quality is achieved by a final system correction, which is performed by a precision optics master with decades of experience in his field.

Thanks to a novel compensation cell, the lenses of the completely oil spaced objective (without air gaps) are held in stable position with fluctuations in temperature.

The thermal equilibrium sets in quickly and rattling of lenses in the cell with all negative consequences is prevented.

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. On the dew cap the label Polychromat 180/1440, the brand logo APQ as well as the indication of origin Made in Germany are applied.

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 eye-catching color of the OTA stands out significantly from the general standard white and gives the APQ Polychromat a unique and distinctive design with a high value of brand recognition.

The APQ 180/1440 Fluorite Quadruplet Polychromat is a premium refractor that is predestined for all types of observations – visual and photographic.


Polychromat 180/1440 Objective
 

Lens type
Fluorite Quadruplet Polychromatic refractor

Optical design
four lens aspherical design

Coupling technique
completely oil spaced without air gaps

Mounting type
compensation cell

Cell material
high quality aluminum and stainless steel alloys

Polychromatic Strehl ratio
≥ 0,95 (365nm – 1014nm)
(theoretical)

Maximum focal shift range
±0,004% (365nm – 1014nm)
(theoretical)

Anti-reflection coating
Ultra broad band AR coating RAVG < 0.7% (365nm – 1014nm)
(theoretical)

Clear aperture
180mm

Focal length
1440mm

Focal ratio
f/8

Image scale
2.387'/mm or 0.419mm/'

Resolution
0.63"
(theoretical)

Magnification range
33x – 540x
(exit pupil 6mm – 0.33mm)

Test protocol
optical inspection certificate

 
Tube assembly 180/1440
 

Tube and dew cap material
high quality aluminum and stainless steel alloys

Tube and dew cap colors
silver metallic / black metallic
(individual colors such as cream white or black velvet are possible by arrangement)

Tube diameter
Ø197mm

Telescope length
1105mm / 1409mm
(dew cap and focuser retracted / extended)

Dew cap diameter
Ø231mm

Dew cap length
325mm

Backfocus
280mm

 
Feather Touch Focuser FTF3545
 

Focuser
Feather Touch FTF3545

Clear diameter
Ø90.17mm (3.55")

Focusing range
114.3mm (4.5")

Lifting capacity
8.1 – 9.1kg (18 – 20lb)

Reduction ratio
10:1

360° rotatable and lockable
yes

Motorized drive as option
yes

Weight
2.7kg (6lb)

 
Polychromat 180/1440 OTA
 

Adapter
S108 Quick Changer

Dust-covers
covers to protect the lens and tube

Tube rings
optional

Dovetail Plate
optional

Accessories
optional

Weight (including Focuser)
< 17.5kg (38.58lb)

APQ Polychromatic Field Corrector for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs
APQ Polychromatic Focal Reducer Corrector for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs

APQ Tube Rings 197 for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs
APQ Dovetail Plate 360 for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs

APQ Carrying Handle 360 for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs
APQ Steering Wheel 240 for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs

Changers
Prices on request
Change Rings
Prices on request

Extension Tubes
Prices on request
Adapters
Prices on request

APQ Tube Cap 215 – Option for APQ 180/1440 Polychromat
Prices on request
  €
incl. 19% VAT excl. shipping costs
Covers
Prices on request

The eyepieces, mirror diagonals, binoculars and cameras shown here are only intended to illustrate the observation options of the APQ 180/1440. Any resemblance to existing products would be purely coincidental.

APQ 180/1440 Polychromat with eyepiece for visual observations*
APQ 180/1440 Polychromat with mirror diagonal and eyepiece for visual observations*

APQ 180/1440 Polychromat with mirror diagonal, binocular and eyepieces for visual observations*
APQ 180/1440 Polychromat with APQ Flattener and IMX411 (image diagonal 66.7mm) CMOS camera for astrophotography*

APQ 180/1440 Polychromat with APQ 0.7x Reducer and IMX461 (image diagonal 55mm) CMOS camera for astrophotography*
APQ 180/1440 Polychromat – Observation options at a glance*

Product information

APQ Polychromats
APQ 180/1440 Polychromat


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