Description

• 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