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Kowa 501 20-40x50 Compact Angled Eyepiece Spotting Scope (TSN-500 series)

SKU: KWA-501

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Enjoy close up views of your world anytime with the compact Kowa TSN-501 Compact Spotting Scope! Lightweight and small, it is your perfect companion at home, the park or trekking out in the hills.

  • 50mm objective lens provides bright and clear high-contrast images 

  • Full multi-coatings upon all lenses and prisms

  • O-ring sealed and nitrogen purged for perfect performance in the field

  • Lightweight and strong polycarbonate material wrapped in a slip-resistant armour, with a rubberised and textured zoom collar and focus wheel for easy operation

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Kowa enjoys a spectacular reputation of enduring quality internationally. Its optical technology produces high resolution and clarity even in the compact TSN-501 spotting scope, creating memorable and immersive moments every time. 

Its angled design provides you with more comfortable viewings and is unequivocally easier to share amongst a group of observers! The TSN-501 is one compact scope you should have in your hands during your hiking adventures.


Built for the great outdoors:

The TSN-501 is fully waterproof and nitrogen-filled; This tough little scope is designed to perform in harsh environments!

Born to be adventurous | Always with you:

Weighing only 400g and measuring in at 239mm in length, the TSN-501 spotting scope is light enough to take with you even on your longest treks and expedition pursuits.

Keep your eye on target:

With a magnification of 20-40x, this scope is your perfect choice for archery and target shooting 

Close focus captures Nature's secret world:

The scope's close focus performance of 2.5m will allow you to enjoy incredible detail of plants and insects at up to 40x magnification

An optic for all: 

The TSN-500 series is so lightweight and easy to use for all ages! See flowers and insects with incredible detail using the close focus capabilities. A responsible focus wheel and smooth 20x - 40x twist zoom makes operation easy for any age.  


Spotting Scope Info: 


  • Angled Viewing
  • Porro Prism optical path design


20 - 40x

Objective Lens Diameter

50mm (2")

Field of View at 1000m

40 - 28m 

Eye Relief

14 - 12.5mm 

Exit Pupil

2.5 - 1.25mm

Minimum Focus Distance

2.5m (8.2")


Accepts 55mm (2.2") filters (user-provided) 

Lens Type

Standard Glass

Lens Coatings

Fully Multicoated


  • 239 x 124 x 71 mm (9.4 x 9.4 x 2.8")
  • Weight: 396.9g
  • Housing: Lightweight and impact-resistant polycarbonate construction

Environmental Protection

Waterproof (Japanese Industrial Standard protection class 6)

Nitrogen Filled

Yes (O-ring sealed)

Extra Specifications

  • Integrated aiming sight
  • Rubberised and textured zoom collar and single-speed focusing wheel
  • Twist-up eyecup for comfortable use with or without eyewear
  • Equipped with both 1/4"-20 and 3/8"-16 tripod threads (accommodates most photo, video and field tripods)

Additional Information

Additional Information

Eyepiece 1 No
Eyepiece 2 No
Finderscope Make No
Electronic Hand Control No
Motor Drive No
Focal Ratio Not provided by Kowa
Focal Length No
Mount Type No
Aperture 50mm
Tube Length 239mm (9.4")
Highest Magnification 40x
Warranty Information 10 Years Warranty
Additional Specifications of Product No