I got new lens (and may be getting another) and would like to know the correct method to comparing them. Actually, they can't be compared because they are so different but would like to know what sort of settings I should adjust to compare them properly. I guess it would be like as followed :
1. Pick a good subject with a distant background, I think this would separate the subject from its surroundings a lot better.
2. Adjust the f stops for each lens, keep the ISO levels the same (not auto), shutter speed the same and focal length the same. Should I be using A priority settings?
3. Sample size should be original or reduced?
4. Use 100% cropping to compare different areas on the sample (top left right, bottom left right, centre)
5. Low light shooting.
Now that I think about it, that's a lot of work!