Celestron stopped making these lenses; however, they are excellent, color free, and have standard "T" thread mounting. This lens was only used twice and is in "New" condition. It has a standard removable ND 2 filter to sttenuate the light for bright objects. It could be used in many applications including CCD imaging; possibly as a guider if attached to an appropriate CCD.
It is basically an SCT camera lens for "T" thread with an excellent focusing range. It does not have an iris diaphragm.
$75 plus postage and insurance.