![]() ![]() You need to compare the systems as a whole. I n my opinion however it is not fair to simply compare a single full-frame camera with one lens, and a single crop-sensor camera with one lens. And of course if you throw an f/1.8 or f/1.4 prime on full-frame, you’re certainly going to achieve more shallow DOF and better low-light performance overall.Īt this point, the comparison becomes even more difficult. However, what about simply comparing the Sigma 18-35 f/1.8 against, say, a full-frame camera and 2-3 primes, or an f/2.8 zoom? The DOF (depth of field, aka background blur) on an f/2.8 zoom on full-frame is about the same as the DOF of an f/1.8 zoom on a crop-sensor. Sure, there are pretty slim pickings for crop-sensor primes, and if you’re planning on sticking with crop-sensor cameras then the Sigma will be reigning champion for many years to come. If you’re having trouble wrapping your head around this whole comparison, just remember: Barely ~10-15 years ago people were having this very same discussion about f/2.8 zooms versus f/2.8 primes- f/2.8 zooms were finally becoming sharp enough that f/2.8 primes were becoming obsolete. I work as a wedding photojournalist, and as far as mid-range lenses are concerned I would definitely rather have this Sigma 18-35 f/1.8 plus a more versatile zoom like the Nikon 16-85, instead of a single f/1.4 prime and a 17-55mm f/2.8 zoom. In this light, the Sigma 18-35 f/1.8 makes a whole lot of sense. Thus, we are left with 28mm f/1.8 primes (both Canon and Nikon make them) …and of course the 35mm f/1.8 and f/1.4 primes that are made specifically for crop-sensors. Next, the Canon / Nikon 24mm f/1.4‘s are very pricey full-frame lenses, so they are once again not very practical for a crop sensor shooter. There’s the Sigma 20mm f/1.8, but it is pretty old and quite soft wide open. This introduces a whole can of worms- Firstly, there simply is no 18mm f/1.8 crop-sensor prime available. And as such, there simply is no single lens on the market that can compare really you should be comparing the Sigma 18-35 against 2-3 primes. While you might be tempted to compare the 18-35mm to “regular” 17-55mm f/2.8 mid-range zooms on a crop-sensor, in my opinion the Sigma compares better with primes. As we already hinted a little bit, it’s hard to compare this lens to others because it goes in a completely new direction.
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