Outstanding Pentax 67 lens for wide field astro work. This fully apochromatic ED lens provides pinpoint stars to the very corner of the frame that covers an 8 degree by 10 degree field.
It is essentially the same as Pentax's highly acclaimed 100mm F4 ED refractor but with a built in field flattener. Matching 1.4x and 2x extenders are available to convert it to a 560mm f5.6 or 800mm f8.
The lens comes with original Pentax aluminum case, caps, and custom removeable dovetail plate. The lens alone sells for $6,120 new from New York camera houses. There is a used lens like this one at KEH currently selling for $4,299.
I AM OFFERING THIS SETUP FOR $3,000