# Primary Mirror for Telescope, Sky-Watcher SW-5508 (305 mm F/4.0)

**URL:** https://aio.lv/en/product--oem-sw-5508--11024406
**Data updated:** 2026-03-20 09:47 (EET)
**Category:** Telescopes
**Manufacturer:** OEM
**Manufacturer code:** SW-5508
**EAN:** 5901691600287
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 754.99 €
**Prices and availability valid until:** 2026-07-17 23:59
**Price without VAT (21%):** 623.96 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--oem-sw-5508--11024406

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 29.06.2026 | free |
| Pickup points | 02.07.2026 | 1.99 EUR |
| Courier delivery to door | 02.07.2026 | 4.99 EUR |

## Summary description

Primary (main) replacement mirror for Sky-Watcher SW-5508 telescope with a 305 mm diameter and F/4.0 focal ratio (F/1200 focal length). Designed as an OEM optical component for Dobsonian or Newtonian-style reflectors, it serves as the primary light-gathering element, restoring imaging and visual performance for deep-sky and planetary observation.

## Long description

Primary mirror for telescope Sky-Watcher SW-5508 with a 305 mm diameter and an F/4.0 focal ratio (effective focal length 1200 mm). This primary (main) replacement mirror is designed for Dobsonian and Newtonian-style reflectors and functions as the primary light-gathering and focusing element. It restores the optical performance of the telescope by re-establishing the correct focal plane and image formation for both visual observation and astrophotography.
Advantages
The mirror offers a large 305 mm aperture that increases light collection for improved resolution and contrast on faint deep-sky objects. Its F/4.0 focal ratio provides a fast optical system that produces wider fields of view and shorter exposure times for imaging. As an OEM-compatible replacement component, the mirror is manufactured to match the optical geometry required for seamless installation into compatible Dobsonian and Newtonian telescope tubes.
Suitable for
 Repair or refurbishment of Dobsonian and Newtonian reflectors that use a 305 mm, F/4.0 primary mirror
 Deep-sky observation of nebulae, galaxies, and star clusters
 Wide-field and short-exposure astrophotography where a fast focal ratio is required
 Visual planetary and lunar observing with appropriate secondary and focuser setup
Key specifications
 Primary mirror material: optical-grade glass (coated reflective surface)
 Clear aperture: 305 mm diameter
 Focal ratio: F/4.0
 Effective focal length: 1200 mm
 Optical configuration: parabolic surface suitable for Newtonian/Dobsonian reflectors
 Surface finish and coating: high-reflectivity coating optimized for visible wavelengths
How to use
Install the mirror as the primary element within the telescope tube following the manufacturer's mechanical mounting points and cell alignment procedure. Ensure the mirror is seated securely in its cell and that any retaining clips or pads are fitted according to the telescope design. After mechanical installation, perform a coarse collimation using a Cheshire eyepiece or laser collimator, then refine alignment with a star test or collimation routine to achieve optimal on-sky performance. Handle the mirror by its edges and avoid touching the optical surface; use clean gloves or finger cots if adjustment by hand is required.
Usage recommendations
For reliable results, perform final collimation at night on a bright star and allow the mirror to reach thermal equilibrium with ambient air before critical observing or imaging sessions. Use appropriate secondary mirror size and focuser backfocus to maintain correct field illumination and focus. Clean the mirror surface only when necessary and follow gentle, non-abrasive cleaning procedures with suitable optical solutions and lint-free wipes to preserve the reflective coating.

## FAQ

### How much does the Primary Mirror Sky-Watcher SW-5508 305mm F/4.0 cost, and is it available for purchase?

The price is 754.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 29.06.2026 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, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can Primary Mirror Sky-Watcher SW-5508 305mm F/4.0 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 OEM 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 OEM 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/11024406/65906563_large.webp