Features:
102mm F-7 ED hand figured with traditional low polishing technology
Doublet air spaced design,one element is ED glass
Sharp color-free image and high constrast   
Fully aluminum structure                      
Collimation screws for each lens
Three metal baffles
Sliding dew shield to reduce glare
Felt-lined mounting rings and dovetail plate
Two speed 2'' highest quality crayford focuser
Fully multi coating
Blackened lens edges