Archived posting to the Leica Users Group, 2017/06/23
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks Jim. I'll give it a try. Best, Bob Bob Adler www.robertadlerphotography.com *"Capturing Light One Frame At A Time"* On Fri, Jun 23, 2017 at 9:26 AM, Jim Nichols <jhnichols at lighttube.net> wrote: > Bob, when I need to reduce the noise in images, I turn to Neat Image. It > requires some experimentation, but works if the amount of reduction is kept > to a low level. I think there is a trial version still available. I have > used it as a stand alone tool, and currently have it as a plugin in > Photoshop CC. > > Jim Nichols > Tullahoma, TN USA > > On 6/23/2017 11:14 AM, Robert Adler wrote: > >> Hi Howard, >> Thank you for this workflow of yours. It's very helpful and much >> appreciated. >> I will send you the raw file using the 12,500 ISO. I'd be very curious if >> you have more luck removing the noise. I'm going to play with the DxO >> noise >> program today to see how that works. Noise can be the killer of an image: >> this one is borderline. The NIK Dfine is not working anymore for me and is >> discontinued. I'd love to remove noise in CC, but I don't really >> understand >> how to do it: hit and miss. This despite reading tons about it. >> Thanks again and appreciate your expertise. >> Best, >> Bob >> >> >> Bob Adler >> www.robertadlerphotography.com >> *"Capturing Light One Frame At A Time"* >> >> On Thu, Jun 22, 2017 at 8:49 AM, Howard L Ritter Jr <hlritter at twc.com> >> wrote: >> >> That?s a very nice capture of the region towards the center of the Galaxy, >>> Bob. And even expanding the image on my screen, I don?t see any >>> bothersome >>> noise. There?s virtually none in the dark regions of the hills, and the >>> mottling in the lake and the sky I think is primarily due to the >>> innumerable stars. In any case, the SL?s performance at ISO 12500 is >>> impressive. That region is my favorite binocular target, and now that >>> I?ve >>> discovered how to nearly eliminate the effects of light pollution in my >>> suburban sky, and begun to do sky imaging, it will be a target for that >>> as >>> well. >>> >>> I don?t recall whether you mentioned seeing them when I first posted >>> them, >>> but I took some similar shots of the Southern Hemisphere Milky Way from >>> Australia in April. I took them with a Nikon D810A (the astrophotography >>> model with the less IR-restrictive sensor cover plate) and the Nikon >>> 14-24mm zoom at 14mm or the 24-85mm zoom at 50 or 85mm. The shots with >>> the >>> zoom were done with the camera on a tracking device to avoid star >>> trailing. >>> I used ISOs of 1600-6400. >>> >>> http://gallery.leica-users.org/v/hlritter/Gallery_001/ < >>> http://gallery.leica-users.org/v/hlritter/Gallery_001/> >>> >>> I stretched the histogram of my images in PS by moving the white-point >>> slider to brighten the stars and the black-point slider to darken the >>> background sky, then fiddled with both, plus the grey-point slider, to >>> get >>> the effect I wanted. To get rid of vignetting, I also applied a >>> flat-field >>> correction frame that I took in daylight with a couple of layers of white >>> T-shirt over the lens, and the camera aimed away from the sun at a sunlit >>> scene, and then converted to greyscale. I think my images as posted are a >>> bit hyper-real, but that?s a goal of photographing any celestial targets >>> other than the bright moon and planets. In any case, they carry the >>> flavor >>> of the visual impact of seeing the Southern Milky Way and the Magellanic >>> Clouds, for the first time, from the deep darkness of rural Australia. >>> The >>> left side of the region of the MW that I imaged adjoins on the right your >>> region of the MW at the dense star cloud in the center of your first >>> image. >>> The very different orientation of the MW is what happens when your >>> viewpoint is rotated 65 degrees clockwise! >>> >>> Did you do any post-processing of these images? They have the look of raw >>> images to me. If so, I?d be interested to see what the result of a >>> histogram stretch might be. Would you mind sharing the raw file with me >>> so >>> I can play a little? I?ve added a couple of the raw images to my album so >>> you can see the difference post-processing makes. >>> >>> It?s possible to see very short star trails by enlarging your images. The >>> rule of thumb is that they won?t be easily noticeable if the exposure >>> time >>> is not more than 300 sec divided by the FL in mm, so your 20-sec >>> exposures >>> at 24mm are pushing it. If you?re going to do much of this sort of >>> thing, a >>> camera tracker can be had for about the price of 2 or 3 SL batteries? ? >>> Some of my images were exposed for longer than the rule of 300, which is >>> possible when the region being imaged is well away from the celestial >>> equator, where the stars move fastest. >>> >>> (Pardon me if I?m telling you things you already know!) >>> >>> ?howard >>> >>> >>> On Jun 21, 2017, at 5:28 PM, Robert Adler <rgacpa at gmail.com> wrote: >>>> >>>> Last night I went up to Silver Lake in the Sierras. It's at about 7,800' >>>> elevation. I went to see how the SL with the SL24-90mm would work with >>>> Milky Way photography. The two images were taken at 12,500 ISO @ 24mm, >>>> f/2.8 with a 20second exposure. I shot from 10:30pm until 3:00am... >>>> >>>> Though there is a lot of noise, I don't find it distracting. The drama >>>> of >>>> the center of our galaxy seems to outweigh any noise issues. Please >>>> click >>>> on the image to make it larger to fit your screen: >>>> >>>> http://www.robertadlerphotography.com/p133735760/h8e052599#h8e052599 >>>> >>>> I would appreciate others' opinions as to whether or not they find the >>>> noise distasteful or does it look more like film grain. The images were >>>> post processed in Capture 1. >>>> >>>> Thanks for any opinions in advance, >>>> Bob >>>> >>>> >>>> Bob Adler >>>> www.robertadlerphotography.com >>>> *"Capturing Light One Frame At A Time"* >>>> >>>> _______________________________________________ >>>> Leica Users Group. >>>> See http://leica-users.org/mailman/listinfo/lug for more information >>>> >>> >>> _______________________________________________ >>> Leica Users Group. >>> See http://leica-users.org/mailman/listinfo/lug for more information >>> >>> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information