Originally posted by creampuff Those that claim f/4 is too slow for an rectilinear ultra-wide have simply little idea how difficult it is to design a fast ultra wide angle lens, especially to correct barrel distortion, even frame resolution and resistance to flare. One can handhold a 15mm lens pretty easy due to the short focal length, so there is little disadvantage to go f/4 especially if it is well corrected lens.
I agree. For a 15mm focal length, especially that size, that ain't half bad. Besides, isn't the 14 that already exists of the bigger and faster variety?
Nice, but even as kind of a speed-fiend in lenses, I'd never *carry* a wide lens that big... even if I'd conceivably prefer it once it was on there. This 15, I might conceivably buy and carry and use, ...not as a priority, but if I were buying full-priced lenses pretty regularly.