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Bushnell 171073 10x42 PermaFocus Roof Prism Binoculars

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Bushnell 171073 10x42 PermaFocus Roof Prism Binoculars

Never lose focus on the action again--the Bushnell Perma Focus Binoculars keep you dialed in on your target at any long-distance range with no adjustments necessary. Simply raise them to your eyes and catch the action instantly. With 10x magnification and 42-millimeter objective lenses and the porro lens system, these binoculars maintain a large field of view to catch the action at sporting events and in nature. On cold days you will appreciate not having to take your gloves off to adjust the focus. With precision-crafted, BK-7 prisms and fully coated optics, the binoculars offer bright, crisp images even at low light. And the ergonomic rubber housing provides a secure grip--even with gloves on. Built to last, the Perma Focus 10x42 Binoculars carry a limited lifetime warranty from Bushnell.

Key Features:

  • Unique "Focus-Free" operation--focuses automatically on subject. Please note: Focus-free models are designed for viewing distant subjects. The close-focus limit is subjective and dependent on the user's eyesight.
  • Fully coated optics for improved light transmission and brightness
  • Non-slip rubber armor absorbs shock while providing a firm grip
  • Porro prism system for a wide field of view with edge to edge clarity and great depth perception
  • Magnification: 10
  • Objective Lens Diameter: 42 millimeters
  • Lens Coating: Fully
  • Field of View: 305 feet at 1000 yards / 102 meters at 1000 meters
  • Eyecups: Twist Up
  • Eye Relief: 14 millimeters
  • Focus System: Free
  • Exit Pupil: 4.2 millimeters
  • Prism Glass: BK-7
  • Prism System: Roof
  • Weight: 18.8 ounces / 533 grams
  • Size Class: Standard


  • Perma Focus binoculars with 10x magnification and 42-millimeter objective lenses
  • Fixed-focus operation dials in focus at any distance automatically
  • Fully coated optics for improved clarity and light transmission
  • Ergonomic rubber housing for a secure grip and shock resistance
  • Designed for sporting events and nature observation; limited lifetime warranty
  • 305' Field Of View
  • Never Needs Focusing
  • Permafocus 10 X 42Mm
  • Twist-Up Eye Cups
  •  Fully Coated Optics

Shipping Cost: Free!

Return Policy: Within 30 in the original packaging

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Review Snapshot

  • 4 of 5 stars
48% (34)
25% (18)
13% (9)
9% (6)
7% (5)
  • Like the autofocus, hard to use with glasses   »   Most Recent Review “The individual eye adjustments don't have a wide enough range for me (nearsighted, 20:450) while wearing eyeglasses. Wish they could be made more weatherproof, but still very…”
  • Best Bino's   »   Most Helpful Reviews “I am a huge fan of the permafocus binoculars. Its true, you do not have any adjustments other than the pop up eye covers. Leave them down for prescription glasses or sunglasses.”
  • Good for brightly lit subjects if you're young, have 20-20 vision, and both eyes are the same   »   Most Helpful Critical Reviews “These things work by setting the focus to infinity and reducing the opening on the ocular (eye piece) side. That maximized the range of distances that are in focus and reduces the…”