The worst problem is that when using the 90mm lens, the rise/fall knob is unreachable, behind the struts.
When you've dropped the bed on the IV and tilted back the lensboard to maintain it's parallel relationship to the film, the track is still tilted forward (from the bed drop) and rising or falling movements will throw the focus out. But it doesn't work that way on the IV or V. When y ou do that with a Technika III, the rise/fall track of the front standard tilts back as well. On both the IV and the V, you drop the bed and tilt back the front standard to photograph downwards. That recess makes seeing and manipulating the f/stops and shutter more difficult. That means that you will need a recessed lens board to use a 90mm. The back of the camera is thicker than the III. But there are problems, especially if you use a 90mm lens. It avoids the fussy and overcomplicated lever of the V. And unlike the Technika V, the IV still has a simple knob for the rise/fall movement of the front standard. On the positive side, the camera is noticeably more solid and stable than the III.
I have very mixed feelings about the Technika IV. When I broke that camera, I purchased a Technika IV to replace it. I used a Linhof Technika III for decades. Problematic successor to the Technika III.
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