Cloud Break Optics

0.77x Reducer/Flattener for Esprit 150DX (S20208)

0.77x Reducer/Flattener for Esprit 150DX (S20208) - Main image
$330 $500 In stock

Category: Astrophotography Accessories

  • 34mm fully illuminated field, compatible with both APS-C and full frame sensors
  • 89mm back-focus (55mm when back focus spacer and M48 ring installed)
  • Drops f/ratio from native f/8 (1200mm) to f/6.2 (930mm)
  • Reduces exposure time by 66% compared to native f/8
  • 2.22 x 1.48-degree field of view when used with a full frame camera
  • 1.45 x 0.97-degree field of view when used with APS-C crop sensor
  • Only compatible with Evostar 150DX focuser
  • Includes reducer, metal thread-on caps, back focus spacer and M48 thread adapter
  • Built-in 2" filter cell for mounting filters into light path
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 (4.8 / 5 · 5 reviews)

Ruby ★★★★★

Took a chance on this reducer for my Esprit and the difference is immediate—the f/6.2 speed makes framing on my APS-C sensor a breeze. The 34mm fully illuminated field is sharp corner to corner, no vignetting.

Ava V. ★★★★★

I was a little worried the back-focus adjustment would be tricky, but swapping to the M48 ring was straightforward and gave me a clean 55mm spacing. The full-frame coverage is sharp edge-to-edge with my Esprit 150—definitely worth the upgrade from my old reducer.

Kevin ★★★★★

Finally, a flattener that actually delivers a flat field across my full frame sensor. The drop to f/6.2 made a noticeable difference in my exposure times without compromising star shapes at the corners.

Related Products