Cloud Break Optics

0.77x Reducer/Flattener for Esprit 120 (S20209)

0.77x Reducer/Flattener for Esprit 120 (S20209) - Main image
$315 $525 In stock

Category: Astrophotography Accessories

  • 34mm fully illuminated field but can handle full frame as well
  • 95mm back-focus (55mm when back focus spacer and M48 ring installed)
  • Drops f/ratio from native f/7 (840mm) to f/5.4 (647mm)
  • Reduces exposure time by 68% compared to native f/7
  • Built-in 2" filter cell for mounting filters
  • 3.18 x 2.12-degree field of view when used with a full frame camera
  • 2.08 x 1.39-degree field of view when used with APS-C crop sensor
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Customer Reviews (4.6 / 5 · 5 reviews)

Matthew ★★★★★

Finally got this reducer dialed in on my Esprit 120, and the drop from f/7 to f/5.4 cut my sub-exposure times noticeably. The 95mm back-focus with the included spacers was easy to set up for a full-frame sensor—zero vignetting even at the edges.

Ella C. ★★★★★

I was worried about the back-focus math, but the 95mm specification worked perfectly with my setup. The drop from f/7 to f/5.4 has already cut my exposure times noticeably.

Natalie R. ★★★★★

Cut my exposure times by over a third compared to native f/7, and the 34mm fully illuminated field covers my full-frame sensor without any corner artifacts. Setup was straightforward with the included spacers to get the correct 55mm back focus.

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