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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

Optical Design N/A
Mount Type No
Aperture 50mm
Focal Ratio Not provided by Kowa
Eyepiece 1 No
Eyepiece 2 No
Eyepiece 3 N/A
Finderscope Make No
Electronic Hand Control No
Motor Drive No
Go-To Functionality N/A
Focal Length No
Tripod N/A
Tube Length 239mm (9.4")
Highest Magnification 40x
Warranty Information 10 Years Warranty
Additional Specifications of Product No
Shipping Dimensions N/A
Shipping Weight N/A