This grain focuser is in beautiful condition. As far as i know, it's as good as it gets for a grain focuser. It's weighty, super sharp, and variable angle so you can place it anywhere on the projected image. Essentially same as the Peak Critical Focuser that goes for $250 at B&H http://www.bhphotovideo.com/c/produc...ser_Model.html (tho i've read that the Micromega may be even better). Included is the blue filter. $200 gets it. Let me know if you have questions!