When using wide-angle lenses on the Ikon rangefinder camera, users may want to pick up a ZI Viewfinder from ZEISS in order to ensure accurate framing. This optical finder is designed to demonstrate the perspective of 25/28mm lenses, which provide a wider angle of view than the Ikon's integrated rangefinder. Photographers can use this to check framing while the rangefinder can be used to confirm focus. Also, it easily attaches to the camera's hot shoe.
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My headline says it all. Pick one up before you no longer can. My only issue with these finders is the paring of 25 and 28 framelines; they're simply too close together. Still - 5-stars!
The disadvantage of large or long wideangle lenses on 35mm format rangefinder cameras is that the lenses tend to block the bottom right corner of the cameras built in viewfinder window. To compensate for this blockage it is often helpful to use an accessory finder like this one by Zeiss. The photographer focuses using the rangefinder in the camera then composes using the accessory finder. While this is slower, it does allow the photographer to avoid surprises in the composition if the image. I have been using this Zeiss finder on a Leica M9 with the Zeiss 25mm/2.8 Biogon ZM and Leica 28mm/2.0 ASPH lenses. It seems to have decent framing accuracy, even though its horizontal offset is designed for the Zeiss Ikon ZM camera. The finder has framelines for both focal lengths and also a parallax compensation marks inside the upper part of the frames the top to help with closeup framing. This seems to work well, but don't expect SLR level accuracy in framing! You will be disappointed if you think that is possible with a rangefinder. It's just not. The Zeiss finder is better in terms of distortion and brightness compared to the Voigtlander plastic 25mm and 28mm finders, and seems incredibly well made. Another Zeiss advantage over the plastic Voigtlander ones is that you can replace the standard eyepiece on the back with a diopter to compensate for near or farsightedness. While the diopters have the same thread as Nikon diopters, don't use a Nikon one on the Zeiss. I tried this on a Zeiss 21mm finder and the Nikon eyepiece cracked when screwed in all the way. It apparently pressed up against the rear element of the finder and broke from the middle out. Fortunately, the finder itself didn't get scratched.