Reducer/Corrector (.85x) for Evostar 100 (S20201)

Name: Reducer/Corrector (.85x) for Evostar 100 (S20201)
Brand: Sky-Watcher USA
SKU: S20201
Price: 239.4 USD
Availability: InStock
Rating: 4.6 (5 reviews)

Reducer/Corrector (.85x) for Evostar 100 (S20201) - Main image

$239.4 ~~$380~~ In stock

Category: Astrophotography Accessories

Description

0.85x Focal Reducer/Corrector for Sky-Watcher Evostar 100 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher Evostar 100 ED APO, this superb quality accessory effectively reduces the telescope's focal length by a factor of 0.85x and provides much improved field-edge correction.

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy

If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy

Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy

Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (4.6 / 5 · 5 reviews)

Penelope ★★★★★ Oct 21, 2026

The star field in my recent test shot from the Evostar 100 looks noticeably flatter at the edges than my old setup, and the .85x reduction lets me fit the full Pleiades cluster on my sensor. It threaded on smoothly and didn't shift focus during the session, which is all I really ask for.

Edward ★★★★★ Oct 20, 2026

The reduction ratio is exactly .85x as promised, which noticeably widened my field of view on the Evostar 100 without distorting stars in the corners. One night of imaging showed much tighter star shapes compared to shooting without it.

James D. ★★★★★ Oct 18, 2026

I mounted this reducer on my Evostar 100 and immediately noticed the correction across the entire frame—no more bloated stars at the edges. It threaded on smoothly and cut my exposure times by about 30%, making those faint nebulae pop in less than two hours.