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Also, after checking Astrobin, it became obvious for me that there are good and really bad specimens.
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My first 14mm f2.8 could not achieve focus at infinity (manual focus unit) but it was swiftly returned and replaced with a high quality unit that can achieve focus. It's nowhere near where the infinity mark is and is a bit of fidgeting to get it right but once focused accurately it is sharp on the Milky Way in the right conditions.
I believe my 85mm I purchased used can not achieve infinity focus at f1.4 but should once I stop it down. I complained to the eBay seller and he p****d in my pocket about do this and that in live view but I neither had live view on my D80 nor access to a camera with it. I should have demanded a full refund, especially when the guy told me he had 2 of the same lens hence the sale, the first one was CRAP at f1.4 and I'm assuming that was the reason for 2 identical lenses in his gear.
I can find strip down information for the repair of the focal point on the 35 (which I believe to be sharp and have absolutely no idea how I even come to own it) and repair information for the 135 but not the 85mm and while I've always been prepared to just keep ripping things apart till I fix them or I destroy them (always the former, thankfully) I stopped at a certain point where I assumed going beyond there could make the lens completely useless.
In saying that there is NO doubt OzEclipse got a high quality lens in his kit, it can't just be the K1000.
DX is for APS-C sensor isn't it?
I have one DX Tamron zoom I use on my full frame Nikon but it's not the best (Vignetting). I got it cheap with a busted zoom mechanism but it didn't take long to figure that out and repair it (loose screw under the rubber the slot moved up and down on).
I'd love to see your results!