Finally got time to study them. Have looked at them on two different screens, even.
# 4 has pronounced purple colour artifacts, so I rank this at the bottom. # 1 has a bit lower contrast than the others, as seen in the mark above the "S" and around the screws. # 6 and # 5 tie in sharpness, while different from each other in rendering. Look at the stripe made by running water down from the screw at top, for example. # 3 and # 2 appear "best" in terms of sharpness, with # 2 slightly ahead in apparent contrast, again based on the appearance of the mark above the "S". All said, I think the variation in mottling of the red colour on the sign surface indicates there must be some random error introduced by your image processing here. Hard to tell how this influence the apparent sharpness, but I suspect it does, at this level. You also have a slight variation in selected aperture between lenses, which you haven't explained. If based on info about maximising MTF, I'd understand, otherwise it's just another randomiser. I also think the differences are so small that this is well within the realms of nitpicking. Or measurbation. I don't think there's anything the list can provide for you here that you can't arrive at yourself. Jostein 2009/6/10 Joseph McAllister <[email protected]>: > A bit impractical as far as PDML goes. But thank you for taking a look. > > I had to look at them quite a few times, making sure my eyes were free of > excess liquid, and my glasses perfectly clean, before I was able to pick out > the two best, and the best, given the conditions. Don't think it would be > any better on a tripod, given Anti-shake and shutter speeds from 1/500 to > 1/1000. > > I concentrated on the top bolt of the sign. Compared that to the sharpness > of the flowers against the evergreen to see if back focus was bad. Checked > the two leaves that were closest to the sign on the upper right hand side of > the octagon. I tried making it larger, but they started to fall apart rather > than getting closer. They were only 1/6 of the size of the sensor widthwise, > less in the vertical dimension. > > I've re-cropped, to simplify. Take another look and give me your best > guesses again please. > > http://homepage.mac.com/jomac/PESO/0007/ > > > On Jun 9, 2009, at 15:26 , Ken Waller wrote: > >> I think you'd probably have to print these to answer your question. As >> viewed on the web they all look the same to me - too close to call. >> >> Kenneth Waller >> http://www.tinyurl.com/272u2f >> >> ----- Original Message ----- From: "mike wilson" <[email protected]> >> Subject: Re: PESO - Sharpness comparison >> >> >>> >>> ---- Joseph McAllister <[email protected]> wrote: >>>> >>>> I shot my local stop sign from my deck this afternoon. Six different >>>> lenses. Auto-focused second push on the release on the stop sign, >>>> center spot, center weighted exposure, similar focal lengths, anti- >>>> shake on, MTF mode. >>>> >>>> http://homepage.mac.com/jomac/PESO/0007/ >>>> >>>> If you go through images 1 thru 6, then go back and start over, they >>>> will be in your cache, and load much faster. Makes it easier to compare. >>>> >>>> I'd like to hear from a few of you as to which stop sign you think is >>>> sharpest. I know what I think, but... >>> >>> Based on the images presented, I cannot make any practical choice. They >>> all look about the same. > > Joseph McAllister > Pentaxian > > http://gallery.me.com/jomac > http://web.me.com/jomac/show.me/Blog/Blog.html > > > -- > 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. > -- http://www.alunfoto.no/galleri/ http://alunfoto.blogspot.com -- 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.
