Thanks for doing this, Stan. Exposure is a huge factor in noise generation, and your K-3 shots are underexposed, whereas the others are all a bit overexposed.That pretty much makes comparison of the K-3 shots impossible, but the K-1 and 645Z exposures seem roughly the same. (I know from my own experience, that K-3 isn’t even in the same league as K-1 when it comes to high ISO noise. I think K-5II is much closer to K-3 than to K-1.) I looked at the K-1 and 645Z pics at 25600, since that’s about the highest practical ISO. Don’t have time to wade through them all. I thought 645Z and K-1 were about the same, with the larger 645Z image area giving it an advantage, but not by a lot.
Paul > On 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.
