Question 1

Is this a new or used lens?

Accepted Answer

Brand new, great primary lens!

Question 2

I am not a true professional photographer. I have been taking picture foe over 40 years. What is the difference between the Canon Ef 50mm f/1.4 and the Canon EF 50mm F/1.8? Can real professional photographer tell the difference seeing two pictures taken with both lines?

Accepted Answer

A F/1.4 will allow more light to reach the sensor than the F/1.8 version. Meaning sharper images because you can use faster shutter speeds. It also allows for lower ISO which means less "noise" that you would get from using higher ISO in low light situations. Great for Natural Light photos and a good middle-ground between having to use the "Nifty Fifty" F/1.8 and having to afford thee much higher cost of the F/1.2 version.
If you find yourself having trouble with images taken in low light, without using strobes or off camera flash with your current lens, I'd highly recommend a lens with a wider aperture. In terms of just Numbers you may not think there's much difference between 1.8 and 1.4 but in terms of the amount of light getting through it makes quite a difference!

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