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Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray)

B&H # KOTSN664 MFR # TSN-664
Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray)


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Product Highlights

  • Straight View Configuration
  • Separately-Available Eyepieces
  • 66mm Objective Lens
  • Multicoated, XD Lens
  • Fogproof, Waterproof
  • Magnesium-Alloy Body
  • Coarse and Fine Adjustments
  • 72mm Filter Thread
  • Rotatable Tripod Collar
  • 1/4"-20 Tripod Threading
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Color: Gray

Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray) Kowa TSN-663M 66mm Spotting Scope (Angled Viewing, Green)

Not available with current selections

Configuration: Straight

Angled Straight

Price: $1,020.00

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The gray, straight viewing TSN-664 66mm Spotting Scope from Kowa features high-quality optics built into a body that is designed for reliable use under a variety of viewing conditions. Measuring 12.3" long and constructed from magnesium alloy, this durable scope can provide a wide angle or a versatile viewing range depending on which separately available eyepiece is installed on it.

Compatible Kowa eyepieces include the TE-14WD 30x Wide Angle Eyepiece, the TE-17HD 25x Long Eye Relief Eyepiece, and the TE-9Z 20-60x Zoom Eyepiece.

While in use, the TSN-664 66mm Spotting Scope's PROMINAR XD (eXtra-low dispersion) Lens and a concave dispersion lens work together to minimize chromatic aberrations. Additionally, multicoated optical surfaces help to consistently maximize light transmission, sharpness, and color fidelity.

A nitrogen fill prevents fog accumulation and an O-ring sealed waterproof construction further add to the rugged design of the TSN-664 66mm Spotting Scope. Conforming to JIS (Japanese Industrial Standard) Protection Class 7 waterproofing, this scope can withstand momentary immersion, assuming the eyepiece mount is not open and exposed.

Optical Performance
  • 66mm objective lens
  • PROMINAR XD lens and a dispersion concave lens help to minimize chromatic aberrations
  • Multicoated optical surfaces help maximize light transmission, sharpness, and color fidelity
Use and Handling
  • Smooth and coarse-focus knob
  • Integrated sunshade
  • Rotatable tripod collar with 1/4"-20 threading
Construction Details
  • Magnesium-alloy body
  • Nitrogen-filled to be fogproof
  • O-ring sealed to be waterproof
Objective Lens Diameter 66 mm
Minimum Focus Distance 19.7 ft (6.0 m)
Mounting Thread 1/4"-20
Filter Thread 72 mm
Weatherproofing Waterproof, O-ring sealed
Dimensions 12.30 in (31.20 cm)
Weight 2.25 lb (1.02 kg)
Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray)
  • Front Lens Cap
  • Rear Eyepiece Mount Cap
  • Limited Lifetime Warranty

    by PowerReviews
    KowaTSN-664 66mm Spotting Scope (Straight Viewing, Gray)

    (based on 2 reviews)

    Ratings Distribution

    • 5 Stars



    • 4 Stars



    • 3 Stars



    • 2 Stars



    • 1 Stars



    Reviewed by 2 customers

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    Great Spotting Scope

    By Jump'n Jim

    from Leesburg, VA 20175

    About Me Casual/ Recreational

    Verified Buyer


    • Bright Eyepiece
    • Sensitivity Controls
    • Strong Magnification


      Best Uses

      • Shooting

      Comments about Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray):

      A high quality, well built product. Optics are very clear, crisp and bright.

      • Was this a gift?:
      • No

      Share this review

      (3 of 3 customers found this review helpful)


      High quality optics

      By dlmphotog

      from Honolulu, HI

      About Me Casual/ Recreational

      Verified Reviewer


      • Lightweight
      • Portable
      • QUALITY
      • Strong Magnification


        Best Uses

        • Birding
        • Security
        • Shooting
        • Spotting
        • Surveillance
        • Wildlife

        Comments about Kowa TSN-664 66mm Spotting Scope (Straight Viewing, Gray):

        High quality optics in a lightweight portable package. I am very impressed with the quality of this product. Construction is first rate and very solid with good ergonomic features. The optics are amazing with no color fringing or distortion. I use the scope with a KOWA TSE-Z9B 20-60x eyepiece, another quality item.

        I am amazed every time I use this scope at the distances I can see, with such detail! I can spend hours looking through the scope enjoying all the detail that has been hiding in plain sight. You can even get photos using and iPhone held up the eyepiece… The image is surrounded by a black circle but the detail is amazing.

        I would recommend the CNW-10 Kowa Cordura Carrying Case. The case is great and is very fast to open and offers protection from bumps and scrapes. You will also need a solid tripod and head as any vibration is easily seen at the high magnification this scope is capable of.

        • Was this a gift?:
        • No

        Share this review

        Eyepieces & Accessories

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        Required item: Please be sure to purchase a compatible eyepiece in order to enjoy this spotting scope.

        Kowa - TE-9Z 20-60x Zoom Spotting Scope Eyepiece
        • You Pay: $339.95

        Cleaning & Anti-Fog

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        Help keep your optics clean & fog free with these tools.

        Pearstone - Microfiber Cleaning Cloth, 18% Gray (7 x 7.9")
        • You Pay: $4.99

        Strap your device securely & carry in comfort.

        Kowa - 66mm Straight Carrying Case
        • You Pay: $64.99


        See more

        Protect your lens or shade your lens from unwanted stray light.

        Tiffen - 72mm UV Protector Filter
        • You Pay: $14.99


        See more

        Capture photos through the eyepiece of a birdwatcher's spotting scope.

        Kowa - TSN-DA1 Digiscoping Digital Camera Adapter
        • You Pay: $140.00

        Attaches to lenses VIA Outside of Eyepiece, DA-1 Series Adapter ring is required. See mounts and supports.

        Tripods and Window Mounts

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        Steady your scope with the support and stability you need.

        Manfrotto - MK393-HM Photo-Movie Aluminum Tripod QR Kit (Black)
        • You Pay: $79.95

        Mounts and Supports

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        Attach TSN-DA1 Digiscoping Digital Camera Adapter with these mounts

        Kowa - DA-1 Series 58mm Filter Adapter Ring
        • You Pay: $45.00

        Rugged Scoping Accessories

        See more

        Enhance your glassing or trekking sessions with these useful tools.

        Celestron - TrekGuide Digital Compass (Black)
        • You Pay: $22.00
        View all Accessories
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