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67 Pentax lenses
The Pentax67 lenses can be very cheap and all will cover the big 16k chip, but only a few of them really rate for the demands of a big flat astro chip and LRGB. The 67 300ED and 400ED are the pick - these don't go all that cheap. Most of the others will suffer from variable chromatic aberration. Some of the 67 lenses are actually pretty soft. I have a recent Pentax67 300mm f4 non ED. Sharp and easily covers my PL11002M but has quite bad CA especially in the blue.
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