Sky-Watcher 0.85x Focal Reducer/Corrector For Pro 120 ED APO Telescope S20202

.85x Reduction For Your Sky-Watcher Pro 120 ED APO Refractor and 150ED Refractor. Helps Correct Distortion Out to the Edge of the Field Requires a 48mm T-Ring

So you want to take the nest step up in your photography with your Sky-Watcher 120mm ED or 150mm ED refractor.  This Sky-Watcher .85x Focal Reducer/Corrector will get you on your way.  The Sky-Watcher S20202 will reduce the focal length by 0.85x effectively widening your photographic field.  However, it will also correct at the edges of the field helping to flatten out the field.

This reducer requires a 48mm T-Ring.