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Styrka S7 8x42 ED Binocular ST-35521



Waterproof, fogproof, shockproof

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Data sheet

Magnification: 8x
Objective diameter: 42mm
Field of view: 409ft/136m @ 1000yds/m
Eye relief: 18mm
Exit pupil: 5.25mm
Near focus: 6.5ft / 2m
Interpupillary distance: 58-72mm
Lens coatings: Fully Multi-Coated – Styrka S7-XLT Coating
Prism type: BaK-4
Waterproof: Yes
Nitrogen purged: Yes
Tripod adaptable: Yes
Included accessories: Lens caps, rainguard, padded neck strap, cleaning cloth, carrying case, harness

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Styrka S7 8x42 ED Binocular Review

The Styrka S7 8x42 binocular is a solid piece of optical equipment.  They look rather nondescript at first glance, with tasteful branding and a modest rubber armored body, and weigh about 24 ounces (with caps attached).  The S7 8x42 measures about 5.75 inches op to bottom with eye cups fully extended, which puts them at about an average size for a well-built 8x42 full size binocular.  Waterproof, fogproof, nitrogen purged, and every unit is tested underwater at 1 meter for 30 minutes.

Mechanics are solid.  The eye cups lock securely into place with little play at all four positions.  The lowest position provides enough eye relief to use the binoculars with glasses, so that shouldn't be an issue.  The center body hinge is just the right amount of "tight" - no so tight that you have to manhandle the binoculars into the correct interpupillary distance, and also not so loose that they will move once adjusted.  The diopter adjustment is smooth and firm, without any grinding or hangups throughout its rotation.  Likewise, the focus knob lives up to the same expectations, with slight resistance, yet easy enough to focus with a single finger.  From close focus to infinity is about 1.4 turns total.  This is appealing to us at least, because it's a good balance between a super fast focus and a super fine (slow) focus.

Ergonomically, there are no complaints.  The rubber armor is slightly "stippled," which provides good grip, and the length of the single bridge actually makes the Styrka S7 8x42 binoculars quite comfortable.  In one handed operation with one finger on the focus knob, the middle finger naturally rests on the bridge, and the ring/pinky seem to fall comfortably around the body ahead of the hinge.  The binocular is just long enough that two hands interlock over the top of the binocular with a little room to spare.

Now, the optics.  On paper, the Styrka S7 8x42 has a pretty wide field of view (409 feet @ 1000 yards) which is a major plus for us.  Everybody has their preferences, and FOV is high on our list.

That wide field of view combined with the speed of the focus make the Styrka S7 8x42 quite an enjoyable bincoular to use.  The clarity and sharpness is nothing short of excellent, and the level of detail you can see through these binoculars is impressive.  That sharpness continues to about the last 10% or so of the sight picture, and there were times when we did a double take because it seemed it may have been less than that.  In addition, depth of field is also very good as well.  Focusing on objects from 150 yards down to about 20 yards required only the slightest turn of the focus knob.

The ED glass in the Styrka S7 8x42 does a pretty good job of cutting out chromatic aberration.  We make it a habit to look for CA in every binocular we review, so it tends to jump out at us.  With this binocular, however, we had to look at some pretty high contrast objects to see even the slightest hint of CA.  Color bias is about as true to life as any binocular we've looked through recently.

Overall, the Styrka S7 is, in our opinion, an excellent performer.  There's certainly no shortage of binocular offerings in the midrange ED category, but we think this is one you may want to check out.  


  • ED GLASS OBJECTIVE LENSES - Advanced, extra-low dispersion (ED) optical glass provides razor-sharp images and superb color correction while dramatically increasing clarity during low-light situations.
  • SXL-MAX FULLY MULTI-COATED OPTICS GROUP - All lens surfaces are coated multiple times utilizing our proprietary SXL-MAX anti-reflective flat broadband coatings for maximum brightness and optimal color, sharpness and image contrast while maximizing transmission across the entire visible light spectrum for true-to-nature color representation
  • PHASE AND DIELECTRIC COATED BAK-4 PRISMS - Advanced coatings dramatically increase light transmission through the prism system for bright, high-contrast images with better resolution, superior clarity and detail
  • 100% WATERPROOF - Fully sealed housing for performance in all conditions; submersion tested for 30 minutes in 1 meter (3.3 feet) of water
  • NITROGEN PURGED - Internal housing is purged of air and filled with nitrogen gas to prevent internal fogging
  • RUBBER ARMOR - Provides tough, durable external protection and a secure no-slip grip
  • TWIST-UP EYECUPS - Twist up or down for a custom fit to your eye with or without eyeglasses
  • TRIPOD ADAPTABLE - Compatible with standard tripod adapters, use on a tripod or car window mount

Included Items

  • TETHERED LENS COVERS AND RAINGUARD - The rainguard and tethered objective lens covers protect the lenses of your binocular from scratches and the elements.
  • PADDED COMFORT NECK STRAP - The included neoprene neck strap is wide and extremely comfortable. Use it in comfort all day.
  • GENUINE SPUDZ™ LENS CLEANING CLOTH - The included Spudz™ lens cloth can be attached to your pack for use at a moments notice. Convenient for when your optic needs a quick cleaning.
  • DELUXE CUSTOM STYRKA CARRYING CASE - The Styrka carrying case included with the binocular can be used as a traditional carrying case but it can also be worm on your chest with the included harness straps. It keeps the binocular close for quick and easy access while protecting it when out in the field.

Overview of the Styrka S7 Binocular Family

All Styrka S7 binoculars are high quality, waterproof/fogproof binoculars built around impressive extra-low dispersion glass, for the best views in any conditions. Styrka S7 binoculars come standard with an impressive kit of accessories, including embroidered carrying case, case strap, padded neck strap, microfiber cleaning cloth, and a binocular shoulder harness.

The Styrka S7 binocular is currently available in three sizes. The Styrka S7 8x30 is perfect for hunters who stalk because of its small, lightweight, compact form.  The Styrka S7 8x42 is an excellent all-around binocular for any situation you encounter during the hunt.  And the Styrka S7 10x42 has the extra magnification you need to glass game at longer distances.

Care and Feeding of your Styrka Binocular

Your Styrka binocular is designed to provide you with years of dependable service in the field if cared for and stored properly.

  • Protect the binocular from impact and do not force any of the moving parts beyond their limits.
  • Protect the optics of your binocular by putting on the lens caps and rainguard when not in use.
  • Store your binocular in a cool, dry place whenever possible.
  • When storing for an extended period of time, place the binocular in a plastic bag or airtight container with a dessicant.
  • Do not leave the binocular in a car on a hot or sunny day, or near anything that generates heat as this may cause damage.
  • Clean any dust, dirt, or water that may get on the binocular or inside moving parts as soon as possible. This prevents unforseen damage to mechanical parts of the binocular.

Proper cleaning of the lenses is essential to maintaining the optical integrity of your binocular. Dirty lenses diminish the amount of light transmitted through the binocular and your overall viewing experience.

  • Remove any dust on the lenses with a soft lens brush or can of pressurized air.
  • Using the included microfiber cleaning cloth, rmove any fingerprints, stains, or smudges from the lens surface by rubbing in a circular motion. Start in the middle of the lens and work your way to the edges. Breathe lightly on the lens to provide moisture, if needed.
  • For a more thorough cleaning, we recommend the use of a lens/optics cleaning kit. Follow directions included with your kit for best results.

The Styrka Warranty - It's more than a warranty, it's a commitment.

All Styrka binoculars, rifle scopes, and spotting scopes are covered by Styrka's no questions asked warranty. If your product is damaged or malfunctions, it will be replaced or repaired at no charge to you. In addition, your Styrka product is entitled to an annual tune up. Not that you'd ever need it, but in the unlikely event, the option is there to keep your Syrka functioning like new for a lifetime of service.

If warranty problems arise or repairs are necessary, contact the Styrka customer service department. Styrka makes the promise of prompt attention and service, and they understand the importance of optics to your outdoor experience. Styrka takes pride in not only providing outstanding products, but excellent customer service as well.


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Styrka S7 8x42 ED Binocular ST-35521

Styrka S7 8x42 ED Binocular ST-35521

Waterproof, fogproof, shockproof

Write a review