APM MS 10×50 ED

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Objective diameter:  50 mm
Magnification:  10 x
Exit pupil: 5 mm
Eye relief (acc. to spec): 20 mm
Usable eye relief (measured from rim of eyecup): 16.5 mm
IPD:  56 – 74 mm
RFOV:  6.5  degrees = 114 m
AFOV (measured, rounded): 65 degrees
Minimum focus distance (measured): 9.8 m
Focus type:  IF
Range of diopter adjustment (acc. to spec.): +/- 5 dpt
Excess focus travel beyond infinity position (estimate): 6 dpt
Prism system:  Porro I
Waterproof: yes
Weight (measured, with eyepiece cover and strap): 1‘418 g
Made in: China


This binocular competes head-on with the well established and iconic Fujinon 10×50 FMT-SX2 (see separate post, https://binocular.ch/fujinon-10×50-fmt-sx2/), which over the years has obtained “cult status” among hobby astronomers because of its bright, flat image with excellent edge sharpness. The APM 10×50 ED succeeds the Lunt Engineering MS 10×50 (see separate post, https://binocular.ch/lunt-engineering-10×50-ms/) and has improved optics (ED glass), but otherwise identical specifications.


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