Originally posted by GoremanX gah! Let's get back to M42 adapters, it's less confusing.
Indeed! But first, I'll mention that a few years ago I drove from Arizona to Alaska and back. Stopped at a minimart/grocery on a First Nations reserve in northern BC on the Stewart-whatever hwy (#37). Half-gallons of fresh milk (CN$12) cost more than half-gallons (pardon me, two liters) of maple syrup (CN$10). Guess what we bought to pour into coffee?
Anyway, adapters. Two years ago, I still paid around US$40 for an Official Pentax. That's why I bought a pile of cheapies at around US$10 each. And I got a safe, easy, flanged (non-infinity-focus) adapter for about US$10.
I've been using that flanged adapter more and more, and I think I'll get some more. Sure, you lose infinity focus. When shooting wide-open at closer subjects, is that really a loss? With longer slower lenses, it narrows DOF even more, so trap-focus is the way to go.
I've just been shooting my razor-sharp little Tele-Takumar 200/5.6 and even wide open, it still focuses to at least 75m. (I know it does, because I get green-hex confirmation, and trap-focus works.) And its near-focus drops from 2.5 to 2m. With much shorter, faster lenses, the far-focus is indeed pulled in quite a ways, maybe to 2-4m for 35-60mm primes -- which is pretty ideal for portraiture, eh?