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.
