I used a Peak 4x loupe for years but saw so many people raving about the Toyo loupe that I figured why not give it a try for $30. I really didn't like it, only because it is round. The Peak loupe was square so that you could get right up into the corners, which is often where your problems, particularly vignetting, will show up. With the Toyo I couldn't see in the extreme corners. I quit using it and went back to the Peak loupe. The Peak loupe was a little more expensive - around $50 or so as I recall. Personally I wouldn't use anything except a square loupe for ground glass focusing. The folding focusing hood on my Linhof Technika is totally useless except as a ground glass protector so I don't use it and use a dark cloth (Darkroom Innovations) instead, so length of the loupe wasn't a consideration for me. The Peak is short and probably would be difficult to use with a folding focusing hood.
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