35mm. I have the pentax for medium format. Am leaning towards either a ZI, an M6, or for the candeh option, an xpan, of which I've seen quite a few of on ebay for a lot less than I thought. I currently use my himatic the most by far, and it suits me well (the flash sync up to 1/500 is pretty cool), but the viewfinder is somewhat lacking, and I find myself sometimes wanting a bit wider or a bit longer than the 45mm lens it has. I plan to sell off a few of my other cameras, as I feel wasteful having them and not using them as much.