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stevemark
Joined: 29 Apr 2011 Posts: 3754 Location: Switzerland
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Posted: Mon Dec 18, 2017 5:39 pm Post subject: Fringe obsession & looking 4 signs of uncorrected aberra |
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stevemark wrote:
In another thread Ian (quite correctly) wrote that i'm suffering from "fringe obsession, ... looking 4 signs of uncorrected aberration" in 100% crops. I have a interesting example from this mornings work which i'd like to share. It is a large window (about 14 meters high) made of small pieces of coloured glass. The glass is unusually thick, and it consist of massive broken pieces - not the usual thin flat glass panes.
For time being i won't add much technical information.
To make sure that i'm not pixel-peeping this time, i have re-sized the original Sony A7 JPGs from 4000x6000 to about 250x400px.
To say it again: These are not 100% crops, but re-sized images!
Both images were shot within a few seconds. The light was exactly the same, and all camera settings were exactly the same. And even the lens was the same nFD 2/135mm, always at full aperture.
Nevertheless these two images are really different. My client would never accept the colors of the left one, since only the right image looks right! And it would be very difficult if not impossible to "correct" the left image with post-processing...
What happened ...??
Stephan
Hint: the thread title, of course _________________ www.artaphot.ch |
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Lightshow
Joined: 04 Nov 2011 Posts: 3669 Location: Calgary
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Posted: Mon Dec 18, 2017 7:05 pm Post subject: |
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Lightshow wrote:
Should have used 1x1 pixel, then there would be no difference. _________________ A Manual Focus Junky...
One photographers junk lens is an artists favorite tool.
My lens list
http://www.flickr.com/photos/lightshow-photography/ |
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marcusBMG
Joined: 07 Dec 2012 Posts: 1304 Location: Conwy N Wales
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Posted: Mon Dec 18, 2017 10:50 pm Post subject: |
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marcusBMG wrote:
Have you got wb and tint settings from exif or from eg lightroom for those images? When I get inconsistent results like that I normally find the difference is due to the camera, and reflected typically in those values.
Were you just doing jpg's, or RAW? _________________ pentax ME super (retired)
Pentax K3-ii; pentax K-S2; Samsung NX 20; Lumix G1 + adapters;
Adaptall collection (proliferating!) inc 200-500mm 31A, 300mm f2.8, 400mm f4.
Primes: takumar 55mm; smc 28mm, 50mm; kino/komine 28mm f2's, helios 58mm, Tamron Nestar 400mm, novoflex 400mm, Vivitar 135mm close focus, 105mm macro; Jupiter 11A; CZJ 135mm.
A classic zoom or two: VS1 (komine), Kiron Zoomlock... |
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jamaeolus
Joined: 19 Mar 2014 Posts: 2931 Location: Eugene
Expire: 2015-08-20
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Posted: Tue Dec 19, 2017 12:09 am Post subject: |
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jamaeolus wrote:
Different portions of the image? ie you had it set in the middle of the right and edge of the left? The difference is a result of poorly corrected aberrations? _________________ photos are moments frozen in time |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Tue Dec 19, 2017 12:11 am Post subject: |
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kds315* wrote:
Very slight focus difference. Had similar when using some projection lenses... LCA _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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visualopsins
Joined: 05 Mar 2009 Posts: 10541 Location: California
Expire: 2025-04-11
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Posted: Tue Dec 19, 2017 12:56 am Post subject: |
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visualopsins wrote:
Assuming the focus or position didn't change between photos, some camera setting responds to a subtle change in the light. Some camera setting is not static. Look at frames of video; not all are identical because ambient light is not steady! _________________ ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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cooltouch
Joined: 15 Jan 2009 Posts: 9097 Location: Houston, Texas
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Posted: Tue Dec 19, 2017 6:11 am Post subject: |
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cooltouch wrote:
My only guess is that if you had white balance set to "auto" maybe the camera decided to interpret the scene differently via white balance settings. _________________ Michael
My Gear List: http://michaelmcbroom.com/photo/gear.html
My Gallery: http://michaelmcbroom.com/gallery3/index.php/
My Flickr Page: https://www.flickr.com/photos/11308754@N08/albums
My Music: https://soundcloud.com/michaelmcbroom/albums
My Blog: http://michaelmcbroom.com/blogistan/ |
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Abbazz
Joined: 23 Jun 2007 Posts: 1098 Location: Jakarta
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Posted: Tue Dec 19, 2017 9:37 am Post subject: |
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Abbazz wrote:
kds315* wrote: |
Very slight focus difference. Had similar when using some projection lenses... LCA |
Yes, it's a bad case of "purple fringing" (the lens was a little back focused). The stained glass would also turn green if the lens were front focused.
Cheers!
Abbazz _________________ Il n'y a rien dans le monde qui n'ait son moment decisif, et le chef-d'oeuvre de la bonne conduite est de connaitre et de prendre ce moment. - Cardinal de Retz
The 6x9 Photography Online Resource:
http://artbig.com/ |
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Tue Dec 19, 2017 10:16 am Post subject: |
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iangreenhalgh1 wrote:
There is an old English idiom worth remembering:
https://en.oxforddictionaries.com/definition/a_bad_workman_always_blames_his_tools
a bad workman always blames his tools
PHRASE
proverb
A person who has done something badly will seek to lay the blame on their equipment rather than admit their own lack of skill. _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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bychance
Joined: 24 Apr 2013 Posts: 345 Location: Kent, England
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Posted: Tue Dec 19, 2017 3:40 pm Post subject: Re: Fringe obsession & looking 4 signs of uncorrected ab |
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bychance wrote:
stevemark wrote: |
In another thread Ian (quite correctly) wrote that i'm suffering from "fringe obsession, ... looking 4 signs of uncorrected aberration" in 100% crops. I have a interesting example from this mornings work which i'd like to share. It is a large window (about 14 meters high) made of small pieces of coloured glass. The glass is unusually thick, and it consist of massive broken pieces - not the usual thin flat glass panes.
For time being i won't add much technical information.
To make sure that i'm not pixel-peeping this time, i have re-sized the original Sony A7 JPGs from 4000x6000 to about 250x400px.
To say it again: These are not 100% crops, but re-sized images!
Both images were shot within a few seconds. The light was exactly the same, and all camera settings were exactly the same. And even the lens was the same nFD 2/135mm, always at full aperture.
Nevertheless these two images are really different. My client would never accept the colors of the left one, since only the right image looks right! And it would be very difficult if not impossible to "correct" the left image with post-processing...
What happened ...??
Stephan
Hint: the thread title, of course |
So, camera, light and lens settings are identical...
Hand held or tripod? what did you specifically focus on within all that back lit colour and contrasting black framework? was the focus pinpoint accurate?
I only ask because I am not that knowledgeable outside of product photography and just dabble really. But, to me as a novice, I wonder if there would be a subtle shift in what the camera would read were the focus point to shift slightly within all those different areas of back lit thick glass and dark. How far from the window would you have to be with a 135mm lens? I don't know how to work that out but I assume quite a distance. That would magnify any movement...
I don't know what I'm talking about but if I wanted to bullshit some fellow idiots, that would be my angle on what caused the difference.
Very interesting post Steve. _________________ I got where I am by avoiding where I was going.
Now where was I? |
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kds315*
Joined: 12 Mar 2008 Posts: 16544 Location: Weinheim, Germany
Expire: 2021-03-09
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Posted: Wed Dec 20, 2017 9:58 am Post subject: |
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kds315* wrote:
Abbazz wrote: |
kds315* wrote: |
Very slight focus difference. Had similar when using some projection lenses... LCA |
Yes, it's a bad case of "purple fringing" (the lens was a little back focused). The stained glass would also turn green if the lens were front focused.
Cheers!
Abbazz |
Exactly my experience too Sebastien!! _________________ Klaus - Admin
"S'il vient a point, me souviendra" [Thomas Bohier (1460-1523)]
http://www.macrolenses.de for macro and special lens info
http://www.pbase.com/kds315/uv_photos for UV Images and lens/filter info
https://www.flickr.com/photos/kds315/albums my albums using various lenses
http://photographyoftheinvisibleworld.blogspot.com/ my UV BLOG
http://www.travelmeetsfood.com/blog Food + Travel BLOG
https://galeriafotografia.com Architecture + Drone photography
Currently most FAV lens(es):
X80QF f3.2/80mm
Hypergon f11/26mm
ELCAN UV f5.6/52mm
Zeiss UV-Planar f4/60mm
Zeiss UV-Planar f2/62mm
Lomo Уфар-12 f2.5/41mm
Lomo Зуфар-2 f4.0/350mm
Lomo ZIKAR-1A f1.2/100mm
Nikon UV Nikkor f4.5/105mm
Zeiss UV-Sonnar f4.3/105mm
CERCO UV-VIS-NIR f1.8/45mm
CERCO UV-VIS-NIR f4.1/94mm
CERCO UV-VIS-NIR f2.8/100mm
Steinheil Quarzobjektiv f1.8/50mm
Pentax Quartz Takumar f3.5/85mm
Carl Zeiss Jena UV-Objektiv f4/60mm
NYE OPTICAL Lyman-Alpha II f1.1/90mm
NYE OPTICAL Lyman-Alpha I f2.8/200mm
COASTAL OPTICS f4/60mm UV-VIS-IR Apo
COASTAL OPTICS f4.5/105mm UV-Micro-Apo
Pentax Ultra-Achromatic Takumar f4.5/85mm
Pentax Ultra-Achromatic Takumar f5.6/300mm
Rodenstock UV-Rodagon f5.6/60mm + 105mm + 150mm
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iangreenhalgh1
Joined: 18 Mar 2011 Posts: 15685
Expire: 2014-01-07
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Posted: Wed Dec 20, 2017 4:58 pm Post subject: |
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iangreenhalgh1 wrote:
Projection lenses often have severe green/red fringing in front and behind the plane of focus. I guess this will be because they were designed to produce the optimum performance on the plane of focus i.e. the projection screen.
Even the 2-3000USD Schneiders and ISCOs are like that. _________________ I don't care who designed it, who made it or what country it comes from - I just enjoy using it! |
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stevemark
Joined: 29 Apr 2011 Posts: 3754 Location: Switzerland
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Posted: Wed Dec 27, 2017 4:51 pm Post subject: |
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stevemark wrote:
Sorry i didn't follow my own thread - there were a few "urgent" additional jobs to do before christmas ... as usual
Detailed answer and additional images will follow.
Stephan _________________ www.artaphot.ch |
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