Originally posted by falconeye benjikan is right. High and low megapixel counts are relative to what we are used to.
Let me try to give you a more absolute feeling of where we stand ...
- Left: an extreme crop of the center where pixels from a hypothetical 24 MP sensor are clearly visible. Just to show how large such pixels are.
- Right: the same crop, but from a real shot with the DA*300 lens onto film. I used a special film emulsion with very fine grain and the crop was taken via a microscope because no film scanner resolves this much.
This gives you a feeling what we are still missing with current digital sensors ... (read, we're going to see 100MP FF cameras and it would still not resolve all detail from my B&W film sample -- e.g., you see that the circular lines have a flat rather than a rounded end). It's also a reason why I said that a Pentax Q adapted to a DA*300 will be an interesting experiment
Correct me if i'm wrong, but what Falk proved was exactly what was in the title: Sensors are the limiting factor, not the lenses. To prove that conclusion, Falk had to use a microscope attached to a K20 camera. (Brings a whole new meaning to the term "pixel-peeping")
But he didn't prove anything with regard to what resolution we need on a practical basis.
Look at what's happening to the pictures we take. Resolution is getting so good with the K20 and K5 and similar competitive brand cameras, that women want special processing so that not every pore is showing in their faces. I know some audubon members who seem to feel that their bird pictures are not sharp enough if the individual branches of each feather are not readily seen (these images almost seem freakish at times). The details so exposed on these birds are often in excess of what we can normally see with our unaided human vision.
For satellites and other military use, research work, etc., one can see uses for ultra high resolution (whatever that means) images, but for a candid street picture or an ID picture for someone's passport or credit card, do we need that same level of resolution?
Buy whatever you want, but i think we're reaching a point where the money poured into ever higher resolution sensors could have been better spent in improving cameras in other ways. For example, i would rather have the following features rather than resolution above 16 megapixels:
a. more reliability (my humble PS Canon with 7 megapixels has never had its firmware updated or needed to be sent to a shop)
b. quiet shutters like the K5, i hate the snap of most cameras
c. better focusing at low light
d. cheaper prices so if they get stolen or dropped, its not that big of a deal. Cheaper also means i don't need to pay for insurance for it.
e. No 1/180s synchro limitation.
We're so used to resolution getting higher and higher with every new model, that we don't question it most of the time. But when i saw Falk using a microscope to ferret out information on a lens' maximum resoluion, it struck me as almost comical as to how specialized our cameras are getting, and not in a good way.
In writing this, i find myself reaching the conclusion that in one or two years, once APS sensors are available in mirrorless cameras, with the features i want, and the lenses i want, I will readily give up the pursuit of the next greatest dslrs with their 100 megpixels. And it isn't just the cost of the camera, its upgrading the computer systems and storage systems to deal with the every larger data files.