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APQ JENA Fluorite Quadruplet Polychromat 150/1200 Refractor (Focuser: Feather Touch FTF3545)
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Focal lens systems

Focal lens systems from APQ JENA

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.


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  • Flattener
  • Reducer 0.7x
  • Barlow lens 2x

Field Corrector (Flattener) for Polychromat 150/1200

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 for Polychromat 150/1200

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 for Polychromat 150/1200

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


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