josoIII wrote:
you already know the term "fast" when referring to a lens. what does that mean, "fast"?
Please let the poster respond in his/her words.
I find it a disturbing trend, that people feel the equipment will not fill their needs for taking photographs, and they don't have the equipment to do research.
One more thing, when looking at a lens chart, you can see how well the lens is made, on the other hand, I have never photograph a lens chart at a wedding...
Fast glass means that you get a large aperture... f1.2-f2.8 are considered fast because you can shoot at a faster stutter speed as more light is getting in because of your large aperture.
And photographing a chart sets a standard. If the image from the chart is clean and undistorted, then the images you capture at the wedding will be clean and undistorted, too. If a lens can't focus properly on a chart... it never will at a wedding.