Carton 100mm f/13 "MD" OTA Construction - 100mm f/13 Mounted Objective Lens (Rear View)
 

The mounted Carton 100mm f/13 Fully-Coated Achromatic Objective Lens and Cell purchased from Sheldon Faworski. [Rear View] (Click to see an enlarged image.)

 
This is a rear view shot of the new vintage Carton 100mm f/13 refractor objective. There are three sets of holes in the cell that will be used in a push-pull arrangement to adjust the tilt of the lens to align it to the eyepiece at the other end of the tube. This takes a bit of practice, but the end result will help to nullify off-axis aberrations you can potentially run into.