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Tokina 11-16 f2.8 vs Tokina 12-28 f4
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<blockquote data-quote="hark" data-source="post: 659184" data-attributes="member: 13196"><p>I've had slight differences in exposure when shooting back-to-back images with the same lens and without zooming in or out. I find it can happen when shooting in Aperture Priority for some reason.</p><p></p><p>As for the differences between the lenses, the f/2.8 lens is heavier because it is faster glass. The f/2.8 aperture would be useful in low light situations. Quite often faster glass is better optically (but not always). </p><p></p><p>As for the sharpness, when a lens is shot wide open, it can be its weakest when it comes to sharpness. The rule of thumb is a lens is sharpest when it stopped down a couple of stops. It's possible the focus point wasn't on the exact same spot in both photos, too, which would affect your depth of field (and what is very sharp). Or it could be a difference optically between the f/2.8's ability and the f/4's. </p><p></p><p>My suggestion would be to take a few more comparison shots if it is possible. See if the f/4 lens is consistently soft or if that was from user error (not focusing on exactly the same point). If the f/4 lens is consistently soft, the lens might not be a good copy. Once in a while identical lenses can vary in their optical quality and a bad one gets thrown into the mix. The f/4 (12mm-28mm) has a better range with its focal length so it would be more useful. Plus it is lighter. If you can take more comparison photos and find it has good sharpness, not just at f/4 but also shoot at f/5.6, f/8, and f/11), then my suggestion would be to go with that one. If the sharpness just isn't there, try to find a different copy of the lens and see if it is any better.</p></blockquote><p></p>
[QUOTE="hark, post: 659184, member: 13196"] I've had slight differences in exposure when shooting back-to-back images with the same lens and without zooming in or out. I find it can happen when shooting in Aperture Priority for some reason. As for the differences between the lenses, the f/2.8 lens is heavier because it is faster glass. The f/2.8 aperture would be useful in low light situations. Quite often faster glass is better optically (but not always). As for the sharpness, when a lens is shot wide open, it can be its weakest when it comes to sharpness. The rule of thumb is a lens is sharpest when it stopped down a couple of stops. It's possible the focus point wasn't on the exact same spot in both photos, too, which would affect your depth of field (and what is very sharp). Or it could be a difference optically between the f/2.8's ability and the f/4's. My suggestion would be to take a few more comparison shots if it is possible. See if the f/4 lens is consistently soft or if that was from user error (not focusing on exactly the same point). If the f/4 lens is consistently soft, the lens might not be a good copy. Once in a while identical lenses can vary in their optical quality and a bad one gets thrown into the mix. The f/4 (12mm-28mm) has a better range with its focal length so it would be more useful. Plus it is lighter. If you can take more comparison photos and find it has good sharpness, not just at f/4 but also shoot at f/5.6, f/8, and f/11), then my suggestion would be to go with that one. If the sharpness just isn't there, try to find a different copy of the lens and see if it is any better. [/QUOTE]
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Tokina 11-16 f2.8 vs Tokina 12-28 f4
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