Kowa TSN-AS1.25K Astro Adapter for TSN-99/88/66 Series
- 1.25" astro eyepiece compatibility for expanded night-sky viewing options
- Knurled screw fixing allows fast, secure eyepiece changes
- Designed for TSN-99, TSN-88, and TSN-66Â PROMINAR spotting scopes
- Lightweight and travel-friendly for portable astronomical use
- Works with Kowa EX16 1.6x extender for deep-space viewing potential
- Dual-purpose versatility for both terrestrial and astronomical observation
Expand the capabilities of your Kowa PROMINAR TSN-99, TSN-88, or TSN-66 spotting scope with the TSN-AS1.25K Astro Adapter. Designed with a convenient knurled screw fitting, this adaptor allows the use of standard 1.25" astronomical eyepieces, transforming a premium terrestrial scope into a compact and versatile tool for night-sky observation. Ideal for travellers and outdoor enthusiasts who want to enjoy both daytime viewing and astronomy without carrying bulky equipment, it offers seamless compatibility, quick eyepiece changes, and exceptional optical performance when paired with Kowa’s fluorite crystal scopes. Lightweight, portable, and reliable, the TSN-AS1.25K opens up a world of viewing possibilities.
- Compatibility: TSN-99 / TSN-88 / TSN-66 PROMINAR spotting scopes
- Eyepiece Fitting Size: 1.25"
- Fixing Type: Knurled screw
1.25" Astronomy Compatibility – Accepts standard 1.25" astro eyepieces and accessories for greater flexibility in night-sky viewing.
Knurled Screw Fixing Mechanism – Comfortable, tool-free handling allows quick and secure eyepiece exchange.
Premium Scope Integration – Engineered exclusively for TSN-99/88/66 PROMINAR spotting scopes for a precise optical fit.
Portable Dual-Purpose System – Converts a compact spotting scope into an astronomy-ready setup, reducing the need for bulky telescopes when travelling.
Extended Viewing Potential – Compatible with the Kowa EX16 1.6x extender to increase magnification for deep-space targets.
Optimised Optical Performance – Designed to pair with fluorite crystal scopes that significantly reduce chromatic aberration for clearer night-sky detail.
- Kowa TSN-AS1.25K Astro Adapter for TSN-99/88/66 Series
- 2x knurled screws
- Kowa 2 Year Warranty
Tactical Scope Shipping Policy
Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.
Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.
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Couriers
We use DPD, Royal Mail, TNT, and UPS courier services for all our UK and international orders. Once your order is dispatched, you will receive an email with your unique tracking number.
In-Store Items
These are items we have in stock and aim to dispatch within 1–2 working days. During busy periods, this may be delayed slightly. If you'd prefer to collect your item in person, please contact us in advance to arrange. Collection orders must be paid for beforehand.
Pre-Order Items
Pre-order items are typically out-of-stock or in limited supply. Purchasing a pre-order secures your item, and it will be dispatched within 24 hours of restock where possible. Check the product page for estimated restock dates. These dates may change, so staying in touch is advised.
International Delivery & Taxes
If your shipping address is outside the UK, you may incur import duties or taxes upon arrival in your country. These charges are your responsibility. Customs regulations vary, so please check with your local customs office. Some packages may be opened for inspection.
Need Help?
If you need assistance, call us at +44 (0)1803 611895 (Optics Warehouse) or email [email protected].
DPD Shipments & PIN Code Delivery
We have now introduced DPD Pin Code verification for all orders shipped via DPD. You will receive a PIN via email and text.
A valid email and mobile number must be provided at checkout. Emails will come from Riviera House 3PL. Please check spam/junk folders if not received.
Failure to present your PIN to the delivery driver will result in a failed delivery and rescheduling may be required.

