This is more difficult - from their press release (http://www.us.ricoh-imaging.com/about/press/285) it appears the application method is different than that of the "normal" coatings (smc included), with a better control of the thickness and evenness; also, compared to the otherwise superior ABC, it should be harder / more resilient to being scratched. I tried to dig through their patents, but I can't accurately say which one is for the HD coating.
Alex On Wed, Dec 4, 2013 at 10:48 PM, steve harley <[email protected]> wrote: > on 2013-12-04 11:15 Alexandru-Cristian Sarbu wrote >> >> On Wed, Dec 4, 2013 at 7:51 PM, steve harley <[email protected]> wrote: >>> >>> are there any tests or other solid information about the qualities of HD >>> vs >>> SMC? >> >> >> Then, the Pentax Forums review is linked to in the original post. This >> is the specific section we're interested in: >> >> http://www.pentaxforums.com/reviews/hd-pentax-limited-primes/aberrations-and-flare.html > > > thanks, i guess i was wondering about the coating in the abstract - what > makes it better? some of the difference in those tests seems due to the > curved blades, but internal reflections and contrast seem to represent the > coatings, however it also seems to vary a lot per lens design > > i have the 15mm SMC, and the only other Limited prime i'm strongly > interested in is the 35; from those shots, HD on a 35 gains a smaller > hotspot at the expense of fuzzy startbursts; bokeh doesn't seem to benefit > at all from the curved blades; what would be most helpful for me would be a > daylight "contrast test" on the 35, like that on the 70, on both a normal > scene and a macro shot > > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
