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A year or two ago i remember someone in some tread saying that we should buy up the old lenses we wanted soon, because they are going to become hard to find, and start going up in price.
I am experiencing that right now.
Not only are new Pentax users buying them up because there are great deals on some great glass, but even Canon video people are looking for some m42 glass. I know because I am doing that for work. We shoot video with a 7D at work, and I recently discovered the m42 to EOS adapter. Saw a Pentax 50mm mounted to a 5D and said... yes please. So I'm reading reviews of primes here in the database, and doing searches for them... those that I find are going for double what the average prices used to be. And even at that cost, the prices are so much lower than the new glass for any DSLR that these will continue to be popular and get rarer.
(I was in a local brick and mortar camera shop with my boss yesterday and he was pricing personal Nikon lenses. They want $800+ for what now? No wonder people are looking for the less expensive alternatives.)
I watched a 105mm Super Takumar f 2.8 SMC go for $212 last night on a popular auction site. I grabbed a non SMC version of the 105mm for just over $100, and felt lucky to get it at that.
The same goes for K-mount as well. The interwebz are littered with the old junk lenses now. A few short years ago I could easily find a Kiron-made Vivitar of every variety. Now I'm wading through promaster and Chinon and 5 star to find the gems. They are still out there, but expect to pay more for them. That's not to say that you can't still find tons of Pentax M 50mm f2.0s. But the f1.4s are much harder to find.
On the one hand it's great that these are being appreciated. On the other... I wish I could find great glass on the cheap somewhere besides getting lucky on craigslist.