Meade Series 4000 f/3.3 CCD Focal Reducer/ Field Flattener:
Permits ultrafast CCD imaging; reduces CCD exposure times by up to 80%. Threads on to the rear cell of all Meade LX-Series mirror-lens telescopes. Converts f/10 Schmidt-Cassegrains to f/3.3 and f/6.3 SCT’s to f/2.
New Cost is $149. I'm selling this one slightly used (2 times) for $115 shipped in CONUS. PayPal or Money Order.