Originally posted by Silent Street I think it would be better to go for a camera that comes with a lens, otherwise it could be serving a bit of time as a paper weight while you go on a worldwide search of a lens to team up with it.
"Normal" for the Pentax 6x7 (1969 and before) or Pentax 67 (1989) lenses are either 90mm or 105mm, both of which are 2.8.
A couple of the much newer aspheric element lenses are very expensive, but have features such as spring-assisted aperture dial, a very light, fast and precise focus and standardisation of filter sizes.
I know you meant the right dates, but just to be clear, the camera was called the "6X7" from its introduction in 1969 through 1989, after which it was called the "67". Differences are minor, other than age. The 105mm lens has a maximum aperture of f/2.4, and all examples are interesting. It's a double-gauss normal lens, but it's quite popular at the moment for those who want exaggerated selective focus. But it's a very good lens stopped down a bit for those who want a really sharp lens. It's the 90 that only opens up to f/2.8.
The newer lenses were also designed to work with the automation of the 67II, which was made from the late 90's on.
To the OP:
How can a bunch of guys on the internet answer this question? You know your preferences. I started with a 55mm f/4--an excellent lens. I use the 45 more often because it's wider still. But I use the 75 often enough, too. The 135 macro is a good lens, and I have used it for commercial work (the last gig for which that lens was ideal was making reproduction photos of paintings for an artist). The 200/4 is a decent lens. But if you want even more selective focus that can be provided by the 105/2.4, look at the 165/2.8.
Bigger formats often have an expansiveness, for reasons that have nothing to do with geometry, not easy to see in smaller formats. It may be because of what it takes to get depth of field (smaller apertures and longer shutter times), or it may be just a biased perception. But I rarely go as wide with larger formats as I do with small-format stuff. I can go down to 12 and 14mm on my full-frame Canon, but the equivalent lenses for the 67 might never be used. So, unless you are a bona fide wide angle freak, the 55 might be a better starting point than the 45. Your own preferences will have to dictate that.
There are few enough dogs in the 67 lens line that you don't have to worry much about getting one.
Rick "who owned the 105 before the 105 was cool" Denney