Those are very good Larry. Much better performance with the K-1 IMO.
On Fri, Jan 27, 2017 at 6:00 PM, Larry Colen <[email protected]> wrote: > I just tried a quick test with the K-1. I initially bracketed five shots, 2 > stops per frame, Tav, set to -2 EV, which gave me -6, -4, -2, 0 and +2, > however my lightroom will only correct up to 5 stops, so I dropped the -6 > EV. > > Four presses of the shutter, two of some shelf lichen in my front yard and > two of the river in my back yard. Only correction in lightroom is nominal > exposure correction. > > On flickr: > https://www.flickr.com/photos/ellarsee/sets/72157675962146534 > > On fluidr so you can see the exif next to each shot: > http://www.fluidr.com/photos/ellarsee/sets/72157675962146534 > > Unfortunately that didn't give me base ISO, I may try fiddling with things > to see if I can get another set that starts at ISO 100. > > > > > Gonz wrote: >> >> I'm using the K-5, considered one of the ISO invariant cameras. Here >> are the images: >> >> Properly exposed with ISO1600: >> >> https://www.flickr.com/photos/66982297@N02/32559204535/in/dateposted-public/ >> >> +4 compensation at ISO 100: >> >> https://www.flickr.com/photos/66982297@N02/32179978780/in/dateposted-public/ >> >> The colors are where the extreme differences are. The histogram >> actually goes to the right at about the same spot. >> >> >> On Fri, Jan 27, 2017 at 5:28 PM, Larry Colen<[email protected]> wrote: >>> >>> >>> Gonz wrote: >>>> >>>> Ok. I've done some experiments to test this whole ISO invariance >>>> subject, which some ascribe almost mythological healing powers to >>>> underexposed images. I'll reveal one pair of experimental images >>>> after I have my methodology down. Hence this post. The results were >>>> so surprising, that it made me question my methodology. >>> >>> >>> Which body are you using? >>> >>>> Here is what I did. >>>> >>>> 1. take an image with ISO 1600 properly exposed. Use manual and set >>>> shutter and aperture for image result that takes up most of the >>>> histogram (avoid blowing highlights) >>>> 2. take a second image with same shutter and aperture but at ISO 100. >>>> I.e. 4 stops underexposed. >>>> 3. Import into lightroom, compensate +4 exposure on the underexposed >>>> ISO 100 image. >>>> >>>> My lightroom has a limit of +4, hence the selection of 100 and 1600 >>>> for ISO values. >>>> >>>> Images should look roughly the same if this methodology is right? Are >>>> the ISO values correct? 100 * 2^4 = 1600, or is this wrong? >>> >>> >>> It looks right to me. Before I had heard of ISO invariance, I sort of >>> discovered it accidentally. When not shooting action, and when I don't >>> want >>> to bother chimping the histogram for every shot, or when I'm shooting >>> wide >>> dynamic range images I'll just bracket, generally three exposures +/- 2 >>> or >>> three stops. >>> >>> My preferred auto exposure mode is usually Tav. I noticed that when >>> bracketing in Tav, after correcting my exposure in lightroom, I generally >>> couldn't see much difference between the three shots. Do note that in >>> the >>> "over" shots I'd get a bit more clipping, and in the "under" shots, I'd >>> sometimes get a bit more noise in the shadows. Also, there seem to be >>> some >>> nonlinearities in the way LR processes files, so they wouldn't always all >>> come out exactly the same after processing, but yeah, modulo some channel >>> clipping, they'd look pretty close. >>> >>> -- >>> Larry Colen [email protected] (postbox on min4est) http://red4est.com/lrc >>> >>> >>> -- >>> 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. >> >> >> >> > > -- > Larry Colen [email protected] (postbox on min4est) http://red4est.com/lrc > > > -- > 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. -- -- Reduce your Government Footprint -- 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.
