Originally posted by ScooterMaxi Jim It probably depends where you are looking because DoF is very low on the shot; if the goal was ultimate sharpness on that shot it would have been dialed down to around f/4 (but the shot would have been less interesting and had more noise due to lower light brought in). Having printed the image significantly enlarged, it is quite a bit sharper than what you state. Possibly a monitor problem - is it old or poorly aligned? In any event, what you downloaded and what was originally processed to TIF are not identical. My essential points are that lenses don't just stop getting sharper once you exceed the Nyquist limit, and this lens performs better on newer, higher resolution (low AA or no AA filter) sensors.
I agree that the difference between K-3 and original K5 is easier to compare due to their comparable sizes - and the sharpness differences are significant (far less significant difference on the newer 16mp sensors with low AA or none).
Keep in mind, as well, that sharpness as we relate it to photography is human perception, not a scientific absolute. What you need to shoot portraits (human or animal) is far less critical than the sharpness needed to convey excellence in a landscape. Pretty much no optic will perform adequately on the Q for landscape work.
This is just I was expecting better from the lense... But as I understand the apperture was the best of the lense and this explain a lot to me. The fast 50mm are not that sharp at large appertures but do offer great bokeh.
As a monitor problem... A problem that would affect only this image, I'am sorry, this look very unlikely to me.
I mean the picture is good enoug to print 12"x8" and have something pleasant. The type of picture and the apperture make it not so sharp overall that is not an issue.
As if the photo is great, for sure it is
We should not think too much of sharpness but use it as a tool. Here you didn't need crop, huge print size or whatever special, so that's perfect. And I think that the Ron point.
The final image once cropped/edited can likely do with 5MP, some say 7, DxO consider 8MP the standard (for 300dpi A4 approximarely 12"x8" prints) in most uses.
As what you need to get theses great 5-7MP, it may require a 24 or 36MP sensor for heavy cropping if you want to stay light and avoid long/heavy tele, if your are after wildlife or if you are after macro. Even for landscape, finding new framing inside the initial image and still get a good quality shoot that can print large enough or the "keep light" strategy is interresting to me. With K5 one shoot panos for example where often a bit limited in term of resolution, with K3 it is ok. All in all it is a TC that doesn't have any optical aberation.
For portraiture if you are not a paparazi, I don't think you should care too much even through it mean if your are using prime like me you can have less prime overall to cover the range and can concentrate more on getting the best one and the one you like the more.
So maybe because I like the possibility for cropping and still have great sharpness in my shoot I can see use for 24MP... Would I see use of 50MP? Maybe but that's not at all critical to me. Putting it inside an FF anyway mean that it goes against my need for staying small/light. Still I see a few usage where it could be of use and of course the more you get, the more limited are the case where you need the extra.