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Rafael, thanks for sharing your insights about the old 15's. How does the 18/3.5 fit in quality-wise?
I really like the koi-image, very cool use of the ultra-wide lens.
My 18 3.5, bouht new, is also a F8 and F11 lens, it is actually fairly sharp at 3.5 and 5.6 but with a lot of illumination falloff, vignetting, this can be used creatively. The 18mm is a bit sharper across the frame. The 18mm is also able to use a 72mm filter. All in all imho the 18 3.5 is a little better, and much cheaper at $500 instead of $1200. Other than vignetting, the 18mm is close to the 20mm performance.