# Refractor optical tube Skywatcher BK 80/400 OTA — 80 mm aperture, 400 mm focal length

**URL:** https://aio.lv/en/product--skywatcher-sw-2000--11156870
**Data updated:** 2026-02-25 16:40 (EET)
**Category:** Telescopes
**Manufacturer:** Skywatcher
**Manufacturer code:** SW-2000
**EAN:** 5901691601024
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 126.49 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 104.54 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--skywatcher-sw-2000--11156870

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

Skywatcher BK 80/400 OTA is a refractor optical tube with an 80 mm aperture and 400 mm focal length. Designed as an OTA (optical tube assembly), it suits planetary and wide-field deep-sky observation and astrophotography with short focal ratio advantages. Use it on compatible mounts for visual observing, basic imaging and as an entry-level portable telescope component.

## Long description

The Skywatcher BK 80/400 OTA is a refractor optical tube with an 80 mm aperture and 400 mm focal length, supplied as an optical tube assembly (OTA) for use on compatible mounts. Its compact, lightweight construction and short focal ratio make it suitable for wide-field observation of star fields, nebulae and large deep-sky objects, as well as for lunar and planetary viewing at low-to-moderate magnifications. As an OTA, it is intended for users who want a portable, entry-level instrument to pair with a variety of mounts and basic imaging setups.
Advantages
This 80 mm refractor provides a well-corrected view across a wide field due to its optical design and moderate aperture, delivering sharp stars and good contrast for many targets. The 400 mm focal length and resulting fast focal ratio allow shorter exposure times for basic astrophotography and ease of framing large objects. The OTA format keeps the unit versatile: it can be combined with different mounts, finders and accessories, and it is convenient to transport and set up for visual observing or quick imaging sessions.
Suitable for
Wide-field observation of star clusters, large nebulae and Milky Way regions
Moon and planetary viewing at low to medium magnifications
Entry-level astrophotography with short-exposure imaging and DSLR or mirrorless cameras
Portable observing sessions and travel setups when paired with a suitable mount
Key specifications
Optical type: Achromatic refractor optical tube assembly
Clear aperture: 80 mm
Focal length: 400 mm
Focal ratio: f/5
Suitable for visual use and short-exposure imaging
Compact and lightweight OTA format for mounting on compatible tripods and mounts
How to use
Attach the Skywatcher BK 80/400 OTA to a compatible equatorial or alt-azimuth mount using the dovetail or mounting bracket provided by the mount manufacturer. Install an appropriate diagonal and eyepiece for visual observation, or a camera adapter and imaging camera for basic astrophotography. Balance the mount after fitting the OTA, perform polar alignment if using an equatorial mount, and use low-power eyepieces to locate targets before switching to higher magnification if needed.
Usage recommendations
Use this refractor OTA for wide-field targets and short-exposure imaging; pair it with a stable mount, a small guide scope if longer exposures are required, and a field flattener or reducer designed for refractors to improve edge sharpness when imaging with larger sensors. Regularly check collimation and clean only with proper optical tools to maintain image quality.

## FAQ

### How much does the Refractor optical tube Skywatcher BK 80/400 OTA cost, and is it available for purchase?

The price is 126.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 6 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 22.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment. All transactions are 100% secure and encrypted.

### Can Refractor optical tube Skywatcher BK 80/400 OTA be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Skywatcher products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Skywatcher service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11156870/65906537_large.webp