This is an ocular only (barrel not included) from the German firm named aboved. Wetzlar is a sub-contractor for Zeiss. You will have to fashion your own barrel which is relatively easy. This ocular has beautiful wide-field optics with a 75 degreee apparent field due to the aspheric eye lens design, (itself in it's own cell). The design was imitated by Pentax in their orthos. The aspheric eye lens has a greater curvature relative to the other elements which gives it fabulous ortho resolution and wide field performance in f8 or greater. There is a slight scratch on the surface that does not affect performance. Zeiss quality! $49. includes shipping. If you don't like it I'll gladly take it back. Paypal accepted. (see ad # 110098 for more).