OK, I realize these are very different lenses but both get a very, very similar score on DXO's lens compare (http://www.dxomark.com/Lenses/Compare/) when mounted on a Canon Mark ll. However, the 50mm is vastly less expensive. Additionally, you could take two shots side by side with the 50mm and stitch them together using a panorama program, such as the very reasonably priced PTGUI or Adobe Photoshop, and obtain a wider FOV than using the 35mm alone. So is there any reason to buy the more expensive Zeiss?

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The main thing is to avoid close objects close to the overlap area when not having the camera mounted on a panoramic head etc. it makes the stitch tricky.
A 35 gets you the necessary field of view when a 50 is just a bit too long. Or maybe it's the way you see. Or perhaps the wider lens separates the subject from the background that little bit more. Or the 50 was more expensive, and you couldn't afford it. Or someone gave it to you.
Is this a question of needing the lens, or wanting the lens? Both are valid, but the former is more subject to logic. 


