0.77x reducer and flattener for Skywatcher Esprit 150 ED APO telescopes

This is a 0.77x reducer and flattener for Skywatcher Esprit 150 ED APO telescopes

• 0.77x Reducer/Flattener for Esprit 150 # S20215
• 36mm fully illuminated field, compatible with both APS-C and full frame sensors
• 90mm back-focus (55mm when back focus spacer and M48 ring installed)
• Drops f/ratio from native f/7 (1050mm) to f/5.4 (810mm)
• Reduces exposure time by 68% compared to native f/7
• 2.54 x 1.7-degree field of view when used with a full frame camera
• 1.66 x 1.11-degree field of view when used with APS-C crop sensor 
• Includes reducer, metal thread-on caps, back focus spacer and M48 thread adapter
• Built-in 2" filter cell for mounting filters into the light path

This is a 0.77x reducer and flattener for Skywatcher Evostar-150ED DX telescope

• 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