This might seem like a very unequal contest. The Leica IIIg is indeed a wonderful camera but the little Vito B does hold its own and bears comparison, particularly as regards the viewfinder and focussing. Firstly I have found that the Vito B 50mm f2.8 (and the more common f3.5 version) are excellent lenses but at medium-near distances and wider apertures need to be focussed with the aid of a rangefinder accessory. The optimum focus is not as tolerant to guesses as is suggested by the depth-of-field scale on the lens. The genuine Voigtlander rangefinder is best because its scale matches that on the lens. This makes setting the focus more intuitive. I wear glasses which presents a problem for both cameras. The peep holes are small so it is difficult to see all the image without moving my eye; using the rangefinders with glasses is fine for both cameras. My prescription is -2.5D spherical plus -1D astigmatic. For the IIIg I found an SLR dioptic correction with -3D. I removed its sides using a Stanley knife and substituted it for the 'double peephole'. I used Blue Tack to fix it. It provides enough adhesion without damaging the body. It works fine! The Vito B was more tricky. Although I can use its rangefinder with glasses, its easier to use the camera with when both the rangefinder and the camera have correction lenses, like the IIIg. For the rangefinder I used a couple of washers stuck together to provide the required offset. I ground a flat on one side, using a bench mounted belt sander, so it would fit. The lens was cut from an old pair of glasses; again it was cleaned up and a flat added by using the sander. Double sided foam tape was used to stick the lens to the washer; Blue Tack to stick the washers to the rangefinder. I was careful to keep the orientation of astigmatic axis since I always use the rangefinder in 'landscape' mode. This would not work for the camera viewfinder in 'portrait' mode so I purchased a lens used for opthalmic swimming goggles (the Aqua Sphere Eagle system). A -3.5D lens worked best. It was easy to cut out the required shape and trim it with the sander. I cut a triangular piece with a 'mousehole' from an Al sheet to get the required offset so I could mount the lens (using the same double sided adhesive and Blu Tak combination). How do they compare? The IIIg viewfinder is great what with its parallax corrected framelines. The Vito B is incredibly bright, I guess because the optics is so simple (just 3 lenses including my correction lens). It's by far the brightest viewfinder of any camera I own. For the rangefinders, the IIIg is 1.5x so being a telescope it needs to be focussed; the Voigtlander is 1x and so doesn't need to be focussed. Both will distinguish by focussing an object at 4 from an object at at 5 metres, although the IIIg is a little better. On the other hand, the 1 metre to infinity rotation of the Vito B lens is 240deg vs. 180deg for the IIIg lens and this makes the Vito B focussing a little better. But its 'splitting hairs', both work fine, the main difference being that the IIIg is coupled and the Vito B is uncoupled. Both are more accurate than my SLR (an Olympus OM-1n) fitted with a 50mm f1.4 lens. With my SLR I can't distinguish by focussing an object at 4 metres from an object at 5 metres (and almost in recognition of this the 1 metre to infinity rotation of my f1.4 lens is only 90 deg) . The Vito B leaf shuttter is slightly quieter than the IIIg cloth shutter but there's not much in it. The Vito B wind on ratchets but the IIIg knob wind is completely silent. Of course the leaf shutter synchronises flash at all speeds. So all-in-all the little Vito B is not steamrollered by its more illustrious opponent. It emerges bloody but unbowed from the contest...and it's a lot cheaper, too!