Entries by Christophe Zumstein

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Nikon 18×70 IF WP WF

Specifications: Objective diameter:  70 mm Magnification:  18 x Exit pupil: 3.9 mm Eye relief (acc. to spec): 15 mm Usable eye relief (measured from rim of unfoldable eyecup): 7 mm IPD:  56 – 72 mm RFOV:  4.0  degrees = 70 m AFOV (measured, rounded):   64 degrees Focus type:  IF Minimum focus distance (estimate): 39 […]

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Nikon Monarch 5 20×56

Specifications: Objective diameter:  56 mm Magnification:  20 x Exit pupil: 2.8 mm Eye relief (acc. to spec): 16 mm Usable eye relief (measured from rim of eyecup): 12 mm IPD:  60 – 72 mm RFOV:  3.3  degrees = 58 m AFOV (measured, rounded): 62.5 degrees Minimum focus distance (measured): 2.5 m Focus type: CF (direction […]

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Steiner Observer 20×80

Specifications: Objective diameter:  80 mm Magnification:  20 x Exit pupil: 4 mm Eye relief (acc. to spec): 13 mm Usable eye relief (measured from rim of eyecup): 3.5 mm (!) IPD:  56 – 72 mm RFOV:  3.3  degrees = 58 m AFOV (measured, rounded): 53.5 degrees Focus type:  IF Minimum focus distance (estimate): 47 m […]

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Opticron Oregon 20×80

Specifications: Objective diameter:  80 mm Magnification:  20 x Exit pupil: 4 mm Eye relief (acc. to spec): 17 mm Usable eye relief (measured from rim of eyecup): 16.5 mm IPD:  56 – 77 mm RFOV:  3.3  degrees = 57 m AFOV (measured, rounded): 55.5 degrees Minimum focus distance (estimate): 35 m Focus type: CF (direction […]

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Omegon Argus 20×80

Specifications: Objective diameter:  80 mm Magnification:  20 x Exit pupil: 4 mm Eye relief (effective, measured from folded-down eyecups): 13.5mm IPD:  56 – 70 mm RFOV:  3.3  degrees = 58 m AFOV (measured, rounded): 65 degrees Focus type:  IF Minimum focus distance (measured): 27 m Range of diopter adjustment (estimate): +/- 5 dpt Excess focus […]

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Celestron Skymaster 20×80 PRO

Specifications: Objective diameter:  80 mm Magnification:  20 x Exit pupil: 4 mm Eye relief (acc. to spec): 15.5 mm Usable eye relief (measured from rim of eyecup): 12 mm IPD:  56 – 72 mm RFOV:  3.2  degrees = 56 m AFOV (measured, rounded): 56 degrees Minimum focus distance (estimate): 16 m Focus type: CF (direction […]

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Celestron Skymaster 20×80

Specifications: Objective diameter:  80 mm Magnification:  20 x Exit pupil: 4 mm Eye relief (acc. to spec): 18 mm Usable eye relief (measured from rim of eyecup): 15 mm IPD:  56 – 72 mm RFOV:  3.7  degrees = 65 m AFOV (measured, rounded): 62 degrees Minimum focus distance (measured): 56 m Focus type: CF (direction […]

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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 […]