"A 50mm f/1.8 lens tends to cost in the $100-150 range—the same as a kit lens—while an f/1.4 lens costs at least twice as much. At their widest apertures, these lenses produce a very narrow depth of focus and create separation between subject and background (or foreground) that adds dimensionality to your photos for flattering portraits.
There’s so little difference, spec-wise, between an f/1.4 and an f/1.8, but the difference in price is huge. How does that translate as far as image quality? All settings being equal, does one lens outperform the other?"
Read more here: http://www.adorama.com/alc/0012817/article/50mm-lens-shoot-out-f18-or-f14 (For those who don’t want to geek out, let me give you the...
Ok - the 1.8/50 is a bargain - its a better choice than any other kit lens - from the optics to the creativity factor - I'm using it quite a lot - on the crop camera it's a fantastic portrait tele and on full frame perfect for everyday shooting - but I still want to change to the 1.4/50 USM as soon as I can because the built and the manual focus of the 1.8 are rather "toyish" - and there are situations you want that extra 1/3 aperture ....
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