I bought the SMC Pentax 67 1:4, as opposed to the 6X7. I haven't been
able to compare the two, and I suspect that not many people have owned
both. Some of the differences are listed at:
http://web.mit.edu/dennis/www/pentax67/lens-info.html
I use my 55mm a lot. It makes very nice 24"x30" prints, via Photoshop
and an Epson 7600. See my website, http://chasfs.com for some examples.
I like the 55mm more than the 45mm because it doesn't distort things
near the edges of the frame as much as the 45mm, though occasionally I
need the extra wideness of the 45mm.
Some more links are available here -
http://medfmt.8k.com/mf/cameras.html - scroll down...
Peace,
-chasfs
http://chasfs.com
> Does anyone know the difference between the 55mm F4 lenses and which
> one is the superior glass? I have read from some that there is no
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>
> Thanks all!!!