# Focal reducer for Sky-Watcher ED100 0.85x — focal reducer model SW-5410 for ED100 refractor

**URL:** https://aio.lv/en/product--oem-sw-5410--11023106
**Data updated:** 2026-03-20 09:47 (EET)
**Category:** Telescopes
**Manufacturer:** OEM
**Manufacturer code:** SW-5410
**EAN:** 5901691601345
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 277.99 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 229.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--oem-sw-5410--11023106

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

Focal reducer 0.85x designed for Sky-Watcher ED100 refractor telescopes (model SW-5410). Reduces effective focal length by 15% to widen the field of view and lower focal ratio, improving framing and exposure times for astrophotography and visual observation. Compatible with ED100 optical tube; useful for wide-field deep-sky imaging and star field capture.

## Long description

The focal reducer 0.85x for Sky-Watcher ED100 (model SW-5410) is an optical accessory that decreases the effective focal length of the ED100 refractor by 15%, producing a wider field of view and a faster focal ratio. Designed to be fitted between the telescope’s focuser and camera or eyepiece train, this reducer preserves the ED glass performance while making it easier to frame extended deep-sky objects and larger star fields. It is intended for users who need broader sky coverage or shorter exposure times without changing the main optical tube.
Advantages
The reducer increases the observable field by reducing the telescope’s focal length and focal ratio, which helps capture larger areas of the sky and reduces required exposure time for imaging. Optics are matched to the ED100’s design to maintain image quality across the field, with minimized off-axis aberrations when used within its compatible backfocus range. The accessory is compact and mounts directly to standard telescope focusers, offering a straightforward mechanical interface for both visual and photographic setups.
Suitable for
Wide-field deep-sky astrophotography with Sky-Watcher ED100
Imaging large nebulae, star clusters and Milky Way fields
Reducing exposure times for planetary and deep-sky imaging workflows
Visual observation when a wider apparent field is desired
Key specifications
Reduction factor: 0.85× (reduces focal length by 15%)
Designed for: Sky-Watcher ED100 refractor optical tube
Function: widens field of view and lowers effective focal ratio
Mounting: fits between focuser and camera/eyepiece (standard mechanical interface)
Primary use: astrophotography and visual wide-field observation
How to use
Install the focal reducer into the telescope’s focuser according to the focuser’s standard mounting method, then attach the camera or eyepiece to the reducer’s output. Achieve focus by adjusting the focuser while observing test exposures or a bright star; small focus adjustments may be required compared to the native ED100 configuration due to the changed backfocus. Verify that the reducer’s backfocus requirement is met for optimal image quality and ensure secure mechanical connections to avoid image shift during long exposures.
Usage recommendations
For best results in imaging, use a flat-field calibration routine (flats) to correct residual vignetting and field illumination falloff. Confirm the reducer’s recommended sensor spacing from the reducer optical surface and check for compatibility with field rotators or off-axis guiders if used. When switching between visual and photographic use, re-check focus and parfocality to maintain consistent framing.

## FAQ

### How much does the Focal reducer Focal Reducer Sky-Watcher ED100 0.85x cost, and is it available for purchase?

The price is 277.99 € (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 03.07.2026 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 Focal reducer Focal Reducer Sky-Watcher ED100 0.85x 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/11023106/65906524_large.webp