HOTECH SCA FIELD FLATTENER The HoTech SCA Field Flattener is fully multi-coated on two-element lens allowing the most efficient light transmission without sacrificing the precious collected light from your telescope. It accommodates f5 to f8 refractor telescope. You will see bright and sharp image across the entire field. To capture great images from your telescope, it is essential to position your camera firmly in and on the optical axis of your drawtube/visual back. The SCA T-Adapter center loads your camera in the drawtube/visual back with a simple threading of a compression ring forcing the built-in rubber rings outward radially, thereby centering the camera in the drawtube/visual back for optimal installation. SCA Field Flattener has built-in standard 2”/48mm (M48-P0.75) filter thread. T-ring thread accepts all kinds of 35mm cameras. It is yet another dream come true for imagers!