Outstanding Pentax 67 lens for wide field astro work. This fully apochromatic ED lens provides pinpoint stars to the very corners of an 8 degree by 10 degree field.
It is essentially the same as Pentax's highly acclaimed 100mm f4 APO refractor but with a built in field flattener. Matching 1.4x and 2x converters are available to convert it to a 560 f5.6 or 800 f8.
This lens comes with removeable dove tail plate(fits A-P mounts, Arca Swiss, etc.), Pentax aluminum case, and caps.
This lens sells new for $6,120 from New York camera houses and there is used lens like this one currently selling for $4,299 at KEH.
I AM SELLING THIS ONE FOR $3,000