Originally posted by BigMackCam The enhanced contrast is interesting, but I wonder how helpful it is in normal shooting. There are times when I find a bit less contrast quite useful, especially in scenes with wide dynamic range. Still, I've been very happy with my HD Limited lenses so far...
It depends on your particular definition of "normal shooting." The approximate grouping of photographic styles that are more or less affected is:
Less affected by coating quality:
* front-lit studio work such as portraits, products, macro
* interiors w/ indirect lighting (no bright windows in the frame)
* moonless astrophotography
* low-key photography (if there's no intense points of light in the scene)
May be affected by coating quality:
* street
* exterior architecture
* wedding
* high-key photography (if you want detailed blacks in the scene)
* (it depends on whether the subject is in shadow & the amount of sky/sun in the frame)
Most affected by coating quality:
* back-lit objects (unless you like the foggy look)
* dark interiors with bright windows in the frame
* back-lit forests
* any image with the sun in the frame (unless you like the foggy look)
* HDR
The quality of the coatings affects the fogging of the image by all the light in the scene. So whether coatings affect an image depends on the required dynamic range range (i.e., lifting detail out of the shadows) and the total light is in the scene (especially blown highlights & bright light sources).
Of course, there's a lot that can be done in post processing to control contrast either to reduce the contrast of images taken with high-quality coatings or to try to recover dark details in a fogged image. But a poor-quality lens with a brightly back-lit or HDR scene will have a DR that is much lower than the sensor's DR -- dark detail in the fogged shadows will be unrecoverable.
If your normal photography depends in the high DR of most Pentax cameras, then higher-quality coatings may be important in back-lit scenes.