Yes, the Super Ikonta IV is 6x6.
I forgot the distance that the camera "thought" it was shooting from but it was somewhere in the neighborhood of 10-15 feet. Yes, that's the thing that puzzles me, too. I thought the background should be more in focus with the aperture at ƒ-22. I should expect things in the 4-foot range to be out of focus. Right? However, the area that I noticed that wasn't in sharp focus before was nearer the left and right edges. That's why I composed it the way you see. The logs that run off the left and right edges are the focus of this test shot. Given that it was shot at ƒ-22, I would expect there to be some fuzziness due to diffraction around the aperture. It was a bright, sunny day and I was shooting Tri-X 400.
That is the best exposure I could get under the conditions. The Synchro-Compur lens only gives you a couple-three choices to work with at this exposure. You're literally bumping up against the limits of the mechanism. I suppose I could manually choose aperture/shutter combinations but I'm not sure that will give me any more headroom. I'll need to get some lower speed film.
Right now, 400 is all I have on hand. The local store has a limited stock of 120 film. I'll have to order it. I'll have to wait until my next paycheck comes.
I'm not completely convinced that advancing the film after opening the bellows has any benefit, either, but there is essentially no cost to doing it that way. I'll try to keep it in mind but, if I forget, I'll won't be worried about it. Furthermore, opening the bellows and advancing the film in random order on the same roll of film would be the ultimate acid test for the theory. Wouldn't it? I'm sure that some cameras like 6x7s would be more susceptible to the problem and, if there is any effect in my camera, it would be minimal. I'm basically going to just file this idea in the back of my brain and see what happens.
I've got one more roll of film, still in the camera. I think I'm going to use the rest of it to do set-up still life shots or something, using a tripod and cable release.
The jury is still out on whether to send the camera for CLA. I'm sure the rangefinder could use some calibration but I've got so many cameras that need it and my funds are so limited. It's hard to decide which ones to get repaired. However, this one is near the top of the list, right now.