Like new, never used. I believe the original price was around $100.
This 1.25" Field Doubler (0.5 focal reducer) attaches to the back of your ETX-90/105/125 or NexStar 4 and effectively shortens the focal ratio of your telescope to f/7. It provides a wider fields of view for your CCD imager or film camera while also reducing your exposure times. Now you can image more of the Moon or that large star cluster or galaxy.
The Field Doubler is designed to allow for a wider field CCD imaging, it is not designed for visual use and the ETX will not reach focus if a diagonal is inserted into it.
Plastic storage box is included.