My focusing aid acessories are discording about focus. Let me explain the story. I am trying to use a Peak 22x over the default 'B' screen of my F-3. I was able to "modify" the acrylic part under the loupe to achieve focus on the screen. Well, at least that is what I thought at first. The view I have using the 22x Loupe over the screen (without the prism, of course) is terrific: I can see all that small dirt over my screen. With an Ai-s 28mm lens focused at an printed ad, 20cm away, I can see the reticle of the offset print that is almost invisible at naked eye. It's very nice to have such a precise view of what I am trying to focus. That was my objective. The problem is between the screen Microprim and the Split Image. When I focus a straight vertical line, whenever the image seems perfectly in focus (and that is very obvious at 22x) the split image don't match. If I try to match the split image, the image is matched but seems blurried. Putting the prism back on, without any magnifier, the correct focused images seems to be those when the split image match. Using a DG-2 2x Magnifier attached to the Prism, the correct focused images also seems to be those where the split image match. It seems to be a conspiracy against the Peak Loupe that makes me think I did something wrong. But the Image through it is so nice, big and clear that it's hard to believe that it's wrong. It just seem that the Microprism and the Split Image can't get into an accordance. What is probably wrong? The screen? My "system" involving the Peak Loupe? Should I trust what I see with the prism and the prism plus the DG-2, even though it seems blurred when I see the screen at 22x? I hope somebody can help me with this one. I am sure that there is a simple optics thing I don't know so I am ingenuously ignoring. Cheers.