Entries by Christophe Zumstein

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Celestron Skymaster 25×100

Specifications: Objective diameter:  100 mm Magnification:  25 x Exit pupil: 4 mm Eye relief (acc. to spec): 15 mm Usable eye relief (measured from rim of eyecup): 10 mm IPD:  56 – 72 mm RFOV:  3.0  degrees = 52 m Focus type:  IF Minimum focus distance (measured): 32 m Range of diopter adjustment (estimate): +/- […]

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Omegon Argus 25×100 MS

Specifications: Objective diameter:  100 mm Magnification:  25 x Exit pupil: 4 mm Usable eye relief (measured from rim of eyecup): 9 mm IPD:  56 – 70 mm RFOV:  2.7  degrees = 47 m AFOV (according to spec.): 65 degrees Focus type:  IF Minimum focus distance (estimate): ca. 50 m Range of diopter adjustment (estimate): +/- […]

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Omegon Nightstar 25×100

Specifications: Objective diameter:  100 mm Magnification:  25 x Exit pupil: 4 mm Eye relief (acc. to spec): 18 mm Usable eye relief (measured from rim of eyecup): 14.5 mm IPD:  59   –  73  mm RFOV:  2.5  degrees = 44 m Focus type:  IF Minimum focus distance (estimate): ca. 40 m Range of diopter adjustment […]

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Vixen ARK 30×80

Specifications: Objective diameter:  80 mm Magnification:  30 x Exit pupil: 2.7 mm Eye relief (acc. to spec): 18 mm Usable eye relief (measured from rim of eyecup): 11 mm IPD: 55  –  70 mm RFOV:  2.3  degrees = 40 m AFOV:  69 degrees Minimum focus distance (measured): 28 m Focus type: CF (direction of rotation […]

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Docter Aspectem 80/500 UWA 40x

Specifications: Objective diameter:  80 mm Magnification:  40 x Exit pupil: 2 mm Eye relief (acc. to spec): 18 mm Usable eye relief (measured from rim of eyecup): 11 mm IPD:  56 – 74 mm RFOV (spec.):  2.2  degrees = 38.5 m AFOV (spec.):  84 degrees Minimum focus distance (estimate): 15 m Focus type:  IF Excess […]

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Kowa Highlander Fluorite 32×82

Specifications: Objective diameter:  82 mm Focal length:  450 mm, magnification is 32x Focal ratio:  f/5.5 Eye relief (acc. to spec): 16 mm IPD:  55  –  76  mm RFOV:  2.2  degrees = 39 m AFOV:  70 degrees Focus type:  IF Prism system:  Roof penta + 45 • Waterproof: yes Weight (measured, with eyepiece cover and objective […]

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Vixen BT-ED70S-A

No longer part of the collection Specifications: Objective diameter:  70 mm Focal length:  400 mm IPD:  57 – (>)80 mm Focal ratio: f/5.7 Waterproof: no Weight (w/o eyepieces, with eyepiece cover and objective caps):   ca. 4000  g Made in: Japan   Remarks: Vixen has been making binocular telescopes (BTs) in three sizes: with 70mm […]

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Vixen BT-81S-A

Specifications: Objective diameter:   81 mm Focal length:  480 mm IPD: 57  –  (>) 80 mm Focal ratio: f/5.9 Waterproof: no Weight (w/o eyepieces, with eyepiece cover and objective caps): ca. 4‘100   g Made in: Japan   Remarks: Just slightly larger than its sibling with 70mm lenses, the Vixen 81 is an achromat – […]

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SIG SAUER Zulu 9 9×45

Specifications: Objective diameter:  45 mm Magnification:    9x Exit pupil:     5 mm Eye relief acc. to spec: 17 mm Usable eye relief (measured from rim of eyecup): 15.5 mm IPD:  56 – 74  mm RFOV:    7.2 degrees =  126 m / 1000m AFOV (measured, rounded): 61.5 degrees Minimum focus distance (measured): 1.3 m Focus type: CF […]

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APM 82mm ED APO

 No longer part of the collection Specifications: Objective diameter:  82 mm Focal length:  470 mm IPD:  54 – 76 mm True aperture:  82 mm (measured) Focal ratio: f/5.7 Waterproof: yes Weight (measured, w/o eyepieces, with eyepiece cover and objective caps): 4‘586g Made in: China Remarks: This is the larger of the two “small” APM binocular […]