flavio81
Member
I've been looking for an objective test on 50mm standard lenses in the f1.8 to f2 range, the kind that came with SLR bodies from the 1960s to 1980s. There is a great deal of anecdote out there, and Googling mostly takes me to subjective comparisons between lens a and lens b, which are neither scientific nor comprehensive. Given that these are the most common lenses around, I'd be interested in any serious optical tests between manufacturer's standard lenses.
There are lots of comparisons out there, but you need to be aware of some caveats:
1. You should test these lenses in full frame digital, or in film. No crop-sensor cameras or the performance test will not be relevant to our analog purposes.
2. Performance should be compared both at closeup (say, 2m) and at infinity, to make a fair assessment.
3. Focus point should be bracketed, if we want the test to be fair
Now, having said that, i will tell you that practically ALL normal lenses by the major manufacturers are good and pretty sharp. So what I'd advise is to look at more delicate factors such as bokeh, and color rendition.
For example my Nikon 50/1.8 is probably my sharpest 50mm lens, but it has harsh bokeh. My Nikkor-S 58/1.4 has some of the smoothest bokeh ever, despite not being sharp at all wide open. Both are just fine at f5.6, as any normal lens should.
At the end I prefer the 50mm lenses that have a "nicer" rendering rather than worrying about which is the sharpest one.