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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 (Front view)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200 (Side view)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200: Strehl Ratio vs. Wavelength (365nm – 1014nm)
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APQ JENA Fluorite Quadruplet Polychromat 150/1200: Chromatic Focal Shift vs. Wavelength (365nm – 1014nm)
Home / Products / Polychromats / Back / Fluorite Quadruplet Polychromat 150/1200

APQ JENA Fluorite Quadruplet Polychromat 150/1200

Fluorite Quadruplet Polychromat 150/1200 from APQ JENA

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
Rectractable and lockable dew cap
Feather Touch Focuser FTF3545

Price
€23,490.00
incl. 19% VAT
excl. shipping costs

Net export price
€19,739.50
excl. shipping costs

Delivery time
10 – 12 months

Inquiry


  • Description
  • Specification
  • Accessories
  • Downloads
  • Ordering information

The Fluorite Quadruplet Polychromat 150/1200 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 150/1200 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 optical tube assembly (OTA) is thermally invariant, to compensate for temperature fluctuations and to bring about a rapid temperature compensation.

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 150mm 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 150/1200, 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 a Ø50,8mm (2") adapter.

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 – black metallic for the dew cap and silver metallic for the telescope tube – stands out significantly from the general standard white and gives the APQ JENA Polychromat a unique and distinctive design with a high value of brand recognition.

The APQ JENA Fluorite Quadruplet Polychromat 150/1200 is a premium refractor that is predestined for all types of observations – visual and photographic.


Polychromat 150/1200 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
0.988 (365nm – 1014nm)
(theoretical)

Maximum focal shift range
64µm ≙ ±0.003% (365nm – 1014nm)
(theoretical)

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

Clear aperture
150mm

Focal length
1200mm

Focal ratio
f/8

Image scale
2.865'/mm or 0.349mm/'

Resolution
0.76"
(theoretical)

Magnification range
30x – 400x
(exit pupil 5mm – 0.375mm)

Test protocol
optical inspection certificate

 
Tube assembly 150/1200
 

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

Tube and dew cap colors
silver metallic / black metallic

Tube diameter
Ø190mm

Telescope length
1055mm / 1319mm
(dew cap and focuser extended / retracted)

Dew cap diameter
Ø207mm

Dew cap length
315mm

Backfocus
200mm

 
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 – 20lbs.)

Reduction ratio
10:1

360° rotatable and lockable
yes

Motorized drive as option
yes

Weight
2.7kg (6lbs.)

 
Polychromat 150/1200 OTA
 

Adapter
Ø50.8mm (2") adapter with clamp ring

Dust-covers
covers to protect the lens and tube

Accessories
optional

Tuberings
optional

Finder shoe / finder scope
optional

Transport case
optional

Weight
15.8kg (34.8lbs.)


The following focal lens systems for Polychromat 150/1200 are in prototype manufacturing.

The Fluorite Quadruplet Polychromat 150/1200 is a universal planetary refractor, a system of the highest possible image quality, in which the basic system represents the polychromatic objective.

Depending on the task of observation, the basic system is combined with a Field Corrector (Flattener), Focal Reducer Corrector (Reducer) or Barlow System (Barlow Lens).

The diffraction-limited correction is maintained in the spectral range from 365nm to 1014nm, so that the UBVRI spectral range of modern CCD and CMOS sensors can be fully utilized.


 
Field Corrector (Flattener)
 

Focal length
1200mm

Focal ratio
f/8

Image scale
2.865'/mm or 0.349mm/'

Polychromatic Strehl ratio
0.974 (365nm – 1014nm)
(theoretical)

Maximum focal shift range
68µm ≙ ±0.003% (365nm – 1014nm)
(theoretical)

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

Image field diameter
Ø73.7mm (3.5°)

Number of lenses
3 (1 x CaF₂)

Coupling technique
oil spaced with one air gap

Back focus
100mm

 
Focal Reducer Corrector (Reducer) 0.7x
 

Focal length
840mm

Focal ratio
f/5.6

Image scale
4.093'/mm or 0.244mm/'

Polychromatic Strehl ratio
0.970 (365nm – 1014nm)
(theoretical)

Maximum focal shift range
31µm ≙ ±0.002% (365nm – 1014nm)
(theoretical)

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

Image field diameter
Ø52.3mm (3.5°)

Number of lenses
6 (2 x CaF₂)

Coupling technique
oil spaced with one air gap

Back focus
100mm

 
Barlow System (Barlow Lens) 2x
 

Focal length
2400mm

Focal ratio
f/16

Image scale
1.432'/mm or 0.698mm/'

Polychromatic Strehl ratio
0.984 (365nm – 1014nm)
(theoretical)

Maximum focal shift range
181.6µm ≙ ±0.004% (365nm – 1014nm)
(theoretical)

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

Image field diameter
Ø10.5mm (0.25°)

Number of lenses
4 (1 x CaF₂)

Coupling technique
completely oil spaced without air gaps

Back focus
200mm

Product information APQ JENA
Fluorite Quadruplet Polychromat



We manufacture exclusively on order.

Inquiries about custom-made products are welcome.

On the one hand, our high quality requirements for the parameters of the CaF₂ blanks greatly limit their availability.

On the other hand, the capacity of our small series and special production is limited in particular by the system correction of all polychromats.

In the end this leads to the fact that is to be counted with longer delivery times (currently 10 – 12 months, with special production also longer).

As the first model of the new refractory series, we are now offering the APQ JENA Fluorite Quadruplet Polychromat 150/1200 refractor to order.

The Polychromat 150/1200 will be available in two versions, which differ in terms of the focuser.

The variant with the Feather Touch Focuser FTF3545 from Starlight Instruments is the first available.

The premium design will optionally receive a performance focuser with a new focusing drive (currently under development).

Outstanding features of the new performance focuser will include unprecedented precision and rigidity with maximum draw tube travel and maximum clear aperture.



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