This adapter has a square window and must be properly oriented according to the camera sensor.
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Astromechanics SBIG STL ASCOM Canon EF Lens Controller Mark II Full Frame Adapter for SBIG STL Series cameras.
Adapter length = 13.5 mm
Designed for cameras with 36×24 mm sensors.
Supports: STL-1001E, STL-1302E, STL-4020M, STL-6303E, STL-11000M
Available on backorder