I want to trade an almost new (3 months old) Televue PowerMate 5x for a PowerMate 2.5x. I just sold my short focal length scope on Astromart, and can't use the 5x with with longer focal length scope (too powerful). However, the PowerMate is a wonderful product, so I want switch to a 2.5x instead -- one in very good condition.
The PowerMate is an image amplifier more than just a standard barlow -- I highly recommend it to anyone. There is very little darkening of the image, just pure magnification. The powermate is awesome. Also, it's fairly short and fits well in a refractor diagonal.