In case weight and size are critical for you with the Pentax 67, the prism adds a lot to the overall weight, and with the WLF instead of the prism, you can save significant weight. Also, there are cheap, light aftermarket grips that you can attach to both sides of the body (don't have to use the big wood grip). Portrait pics without the prism are complicated but the overall kit is actually pretty manageable in size and weight with the WLF and the small grips.
I like my Pentax 67s, fast shutter speed, fast lenses, simple operation, inexpensive generally and accurate focus and of course a huge negative
