Übermatik;142572658 said:
Could anyone clear these up for me? I'm really interested in a good quality lens that's capable of providing good soft backgrounds/has macro ability.
You guys have been really helpful so far, and you've done a great job and narrowing my choice down... just a little more to go before I settle on my new lens!
Crop means you only get the center portion. A lens focuses a circle of light and the sensor or film captures a rectangular part of that sphere. A smaller sensor captures a smaller part. If you where to crop the center portion with a high res, full frame camera you'd get the same image.
The downside is soft lenses get softer (because you're cropping), but the upside is the extreme edges that can be nasty on some lenses are cut and it helps to give you more reach.
That image is a bit deceiving though. There is no perfect circle the 35mm frame fits perfectly within and sharp lenses can get more detailed captured on APS-C cameras with smaller pixels. It is also pointless to focus on that, focus on the best lens for your camera and not what it would do on a different camera.
The 50mm will on a crop Canon give the same field of view that an 80mm lens would get on a full frame Canon and being f1.4 it would have the same depth of field as an f2.24 lens (both were multiplied by the crop factor of 1.6). Therefore it will produce an equivalent image to a 80mm f2.24 lens on a full frame body. This is a popular focal length for portrait, but quite narrow for regular photography.
Regarding the 50 f1.4 it is known to not be the sharpest lens out there and the 50mm f1.8 is much, much cheaper and almost the same performance. Build quality is quite cheap, but it is 100$ lens...
If you want something wider Canon just released the 24mm f2.8 pancake lens. It is slow, so not much bokeh, but the focal length is more versatile. It is not full frame compatible though.
Edit: Sorry for rambling about stuff you already knew