Re the dark exposure of the 50-135, I actually apply 2/3 stop minus comp with mine due a somewhat punchy contrast at times. J
Sent from my iPhone > On Aug 1, 2016, at 3:18 PM, Jack Davis <[email protected]> wrote: > > Thanks much, Stan! All I had to do was find the small identifier. > Sorry I gave up so soon! > Did you use the 1.4 extender to allow for the K-3's APS-C image size? > > J > > ----- Original Message ----- > From: "Stanley Halpin" <[email protected]> > To: "Pentax-Discuss Mail List" <[email protected]> > Sent: Monday, August 1, 2016 1:08:34 PM > Subject: Re: GESO: Making Noise (Comparing ISO noise on K-3, K-1, and 645Z) > > Dan, At least I provided a (sand) bar where you could rest! And a log to sit > on even. Next you’ll be asking for sipping’ whiskey or some such… > > But seriously, I totally understand, and am seldom able to get through this > sort of gallery put up by others. > > Strategy: > 1. If you single-click a thumbnail, the image will about fill the screen, > with a pane of thumbnails to the side. In this view, there is a caption at > the base of each image identifying body and ISO. > > 2. K-1 images are first, then K-3, then 645Z. Then the cropped version of the > same images in the same order - K-1 from ISO 100 to ISO 204800, then K-3 from > ISO 100 to ISO 51200, then 645Z from ISO 100 to ISO 102400. > > In my browser, you can use right and left grow keys to move through, and in > my browser, once I’ve gone through once, it is quite speedy to flick from one > to the next. > > 3. So what I find will tell me the story is to treat it like an eye test of > sorts. No great detailed study of image by image. I start with the K-1, > fairly rapidly go sideways until I hit an image that is just too noisy (by > some undefinable criterion). I do the same with the K-3, the same again with > the 645Z. Repeat the exercise with the cropped versions. > > 4. Once this quick perusal is done, you have identified tentative top-end ISO > on each of the 3 and you can if you like try more detailed comparisons of > e.g. your top-end vs. the next better setting for that camera. > > All of this is quite academic since a) as Paul noted, the results depend > quite a bit on the precise exposure, and b) these are unprocessed images, > compressed into jpegs. To get anything definitive from this you would need > the DNG files to import and play with using the noise reduction processes of > your choice. But I thought this first-cut simple comparison might be at least > slightly more useful than glowing reviews with comments like “usable up to > ISO 6400…”, whatever that means. > > stan > > >> On Aug 1, 2016, at 3:17 PM, Jack Davis <[email protected]> wrote: >> >> Stan, I would like very much to know how to identify these images by camera. >> Guess I'll just say, I don't get your >> system. Can you please "simplify" for the simple minded? Off list would work >> best for me. >> Thanks much, Stan! >> >> Jack >> On Aug 1, 2016, at 1:34 PM, Daniel J. Matyola <[email protected]> wrote: >> >> I tried to look at all the image, but my mind became water logged. >> >> >> Dan Matyola >> http://www.pentaxphotogallery.com/danieljmatyola >> >> On Mon, Aug 1, 2016 at 12:29 PM, Stanley Halpin <[email protected] >>> wrote: >> >>> I think the K-5ii did it best. But I don’t have one to “test”, so I offer >>> for your amusement and edification a series of roughly parallel shots with >>> the three cameras I do have. >>> >>> Equipment: K-1 with D FA 70-200/2.8 >>> K-3 with FA 50-135/2.8 + 1.4 extender. >>> 645Z with FA 150-300/4.0 >>> >>> Conditions: Tripod on my patio, looking across the river. Cloudy day, >>> 2-2:30pm. >>> >>> The shots were all taken with the cameras in AV mode, f/11. Except that at >>> higher ISO levels I ran out of shutter speed and had to increase the f/ >>> stop to avoid over exposure. >>> I tried to find a zoom factor that would yield approximately the same FOV, >>> but then screwed up by adding the 1.4x to the 50-135. Oh well. The other >>> two are at about 190mm effective focal length in 35mm terms, the K-3 was at >>> a about >>> Autofocus on the middle of the log on the sandbar, then refined (?) via >>> manual four with Liveview assist. >>> >>> Shutter release via wireless remote, 3sec delay. >>> >>> I started at ISO 100, then 400, 1600, etc. as high as I could go with the >>> given camera. No post processing other than the cropping. Oh, and my >>> default sharpening @ 35/0.7/35. >>> >>> The full sized images for all three are presented first, followed by a >>> cropped version of the images in the same sequence. Of course some >>> compression occurred when I exported to jpg from LR (max width set at 4800) >>> and then the website II use limits the size of images so imparts its own >>> compression. If anyone is seriously interested, I could put full sized DNG >>> copies in Dropbox. >>> >>> http://photos.stanhalpin.com/p260580110 >>> >>> stan >>> -- >>> 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. > > > -- > 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. -- 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.
