Here is the latest full crop illustration by the NeoCamera:-
http://www.neocamera.com/review_pentax_k7_sharpness.html
(Any of all possible settings can be freely selected)
Play with the different settings and find out the differences, yourself!
In short, the Sharpness, Fine Sharpness, Fine Sharpness 2 of the latest Pentax DSLRs (namely, the K-m, K-7 and K-x) are possibly just USM (UnSharp Mask) with different Radius (and certain appropriate Threshold) whilst the Strength can be user defined, i.e., the +/- 4 settings.
To understand more about USM for image sharpening, I recommend the following articles for reading:-
http://www.scantips.com/simple6.html
(Explained in a simpler way but still much detailed)
http://www.cambridgeincolour.com/tutorials/unsharp-mask.htm
(Explained in a more technical approach (just a little bit) for better understanding on the software manipulation done by the USM)
Monday, November 02, 2009
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Szten · 801 weeks ago
RiceHigh 110p · 801 weeks ago
Szten · 801 weeks ago
Itai · 798 weeks ago
Pentax was very careful to avoid any over-sharpening artifacts but some do appear. At the extreme case, select "Sharpness" and "+4". Then, look at the signs on the calculator, like the X. You should clearly notice that the edges have a black halo. That is a sharpening artifacts. Compate this to the 0 (zero) setting and you' should see the difference.
Note that it is possible for your display to affect this. If you are using an LCD, you need to be at its native resolution and you must make sure any processing is turned off (sharpening, details or the like). If you are using a CRT, then there is an optimal resolution that matches the resolution to the dot-pitch, usually this is one or two standard resolutions below the maximum.