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Schneider 120mm 5.6 Apo Symmar XL or 110mm 5.6 Super Symmar Aspheric
Ok, so they are very close in focal length, and both pretty small lenses.
Super Symmar Pros vs Apo-Symmar:
1) Huge image circle, which would allow generous movements on 4x5 vs the Apo Symmar
Super Symmar Cons vs Apo-Symmar:
1) More distortion since not symmetric? Not sure. The graphs look like it has slightly more distortion than the Apo-Symmar.
2) 2x the price just for the lens, PLUS a center filter!!
I do a fair amount of straight-on urban shots, architecture etc, so the room for significant front rise could potentially be quite useful, but the cost is enormous, and distortion could be an issue.
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The 120mm is not made for 4x5" (if that's what you're shooting). There is conflicting information on its coverage for this format. I wouldn't bother with it.
Also, with the 110mm on 4x5, you probably won't need the cf. And the distortion will be at the edges; you'll need some massive movements to get to this on 4x5.
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The 120mm XL covers 4x5 with ease. Sure it was made for 4x5, it just doesn't offer a huge image circle so there is not so much room for movements, though some movements can be made. It offers suberb imagery, excellent tones and sharpness. I used it for several images in my b&w landscape section:
www.frankbunnik.zenfolio.com
Good luck with your choice, Frank
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Ok, so one vote for the Super Symmar, one vote for the Apo Symmar. So I'm back where I started 
I'm surprised by LJH's post though - Schneider certainly claims the 120 is good for 4x5.
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For 4x5 you will probably not need the center-filter on the 110mm lens. If you need a large image circle, why not look for a wide-angle lens in the 105 - 120mm range? These are a lot cheaper than the 110mm lens.
After my previous post I noticed that the technical details to the 120mm photos on my site were missing so I just corrected that.
Good luck with your choice, Frank
www.frankbunnik.zenfolio.com
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Thanks for the clarification.
Actually 120mm is the focal length I'd most like to have as it fits in nicely between a 150 and 90, and is the equivalent of a ~35mm in the 35mm format, which is one of my favourite angles of view.
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I understand.
I see you are in Montreal so I checked Keh. They have several lenses of 120mm for sale, including several Nikon and Schneider wide-angle versions. These cover 5x7 so they will give you plenty of movement with 4x5.
They also have 2 Fuji 125mm lenses. The difference with 120mm is negligible but the size of the lens will be smaller than a wide-angle lens.
http://www.keh.com/Camera/format-Lar...c=55942&r=WG&f
all the best, Frank
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