Celestron OAG Wide Adapter for 9.25"/11"/14" This adapter works in conjunction with the Celestron Off-Axis Guider to produce a larger area of illumination when imaging through larger SCT & EdgeHD telescopes Custom-designed to pair with the Celestron Off-Axis Guider and a 9.25", 11" or 14" SCT or EdgeHD optical tube Great for larger format cameras like the Canon 5D or 6D-allows use of the full image circle for better illumination of the sensor Machined of black anodized aluminum with a clear aperture of 62.7mm (2.47")