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kansalliskala
Joined: 19 Jul 2007 Posts: 5039 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Mar 11, 2010 8:33 am Post subject: Rainbow Nameplate Jupiter 8 |
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kansalliskala wrote:
No I didn't color it myself, that was combined effort of my Kodak and Sigma 50/2.8 AF Macro (which is otherwise very very good lens).
Does someone know what the proper name of this phenomenon is?
(Ok - "Kodak" is not the right answer )
EDIT: I changed the title, don't want anyone to get offended .. this started as joke but came to be a good thread anyways. This is why I like this forum. _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E
Last edited by kansalliskala on Thu Mar 11, 2010 10:33 am; edited 1 time in total |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Thu Mar 11, 2010 8:52 am Post subject: |
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Spotmatic wrote:
It's lateral chromatic aberration, seen around high-contrast transitions. _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5039 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Mar 11, 2010 9:25 am Post subject: |
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kansalliskala wrote:
It is in the center of the picture ..
Is this the same phenomenon? I saw once the name of it but can't find it again:
_________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Thu Mar 11, 2010 9:44 am Post subject: |
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Spotmatic wrote:
Yes, it is the same. A good read about the subject: http://toothwalker.org/optics/chromatic.html _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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no-X
Joined: 19 Jul 2008 Posts: 2495 Location: Budejky, Czech Republic
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Posted: Thu Mar 11, 2010 10:20 am Post subject: |
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no-X wrote:
Spotmatic: In this situation I can't agree fully. Maybe there is some chromatic aberration, but 90% of this "effect" is created by the Kodak body.
Let me explain:
Kodak (and almost all digital cameras) use bayer sensor, which captures only one color channel per pixel (red or blue or green). If the sensor captures per-pixel details and esp. details in black&white, problem is on the way. Originally color-neutral (BW) data is captured as chromatic data (as red, or blue, or green).
Canon, Nikon, Pentax, Olympus, Sony, Panasonic... use optical "correction" - so called low pass filter, which is placed in front of the bayer sensor (the low-pass filter blurs per-pixel data to prevent capturing of per-pixel details, which would change into color mess - in camera processor then applies some sharpening to make the image look sharp).
Leica doesn't use low-pass filter - they use special software processing to avoid this problem.
Kodak doesn't use low-pass filter, but (at least their older camera models) don't use any software correction.
Here is 1:1 example of this Kodak phenomenon on black/white situation:
Some time ago I posted here this simulated example:
Example of bayer-based camera system without low-pass filter:
A: real image
B: image taken by bayer sensor (what can the camera "see")
C: image processed (debayering) by the camera - quite sharp, but color artifacts are present
Example of bayer-based camera system with low-pass filter:
A: real image
B: what does the low-pass filter do (fine details are removed as prevention of artifacting)
C: image taken by bayer sensor (what can the camera "see")
D: image processed by the camera (debayering)
E: final processing (sharpening)
image lost some detail, but artifacts aren't there _________________ (almost) complete list of Helios lenses |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5039 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Mar 11, 2010 10:30 am Post subject: |
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kansalliskala wrote:
Thank you No-X, this is actually very good news for me!
Now I just need to hack some software ..
It is way easier than hacking the sensor. _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5039 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Mar 11, 2010 11:21 am Post subject: |
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kansalliskala wrote:
no-X wrote: |
Some time ago I posted here this simulated example:
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Here is an example how it looks in real world.
"Hello world!" is Gimp's 1 pixel pen.
100% crop
800% crop
call it pixel-peeping if you like _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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Spotmatic
Joined: 18 Aug 2008 Posts: 4045 Location: Netherlands
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Posted: Thu Mar 11, 2010 11:30 am Post subject: |
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Spotmatic wrote:
Excellent work, no-X! Thanks for explaining it so thoroughly. _________________ Peter - Moderator
Pentax K-5 + Pentax 645 + Canon 5D + Bessa RF 10,5cm Heliar, and a 'little' bag full of MF lenses. The lens list is * here *.
My fast 80s: Asahi-Kogaku Takumar 83mm f/1.9 - Super-Takumar 85mm f/1.9 - FA 77mm f/1.8 Limited - Cyclop 85/1.5 (Helios-40 innards) - Komura 80mm f/1.8 - Meyer Görlitz Primoplan 7,5cm 1:1.9 - Carl Zeiss Jena 80mm f/1.8 Pancolar - Canon 85mm f/1.8 S.S.C. - Canon 85mm f/1.2 S.S.C. Aspherical |
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LucisPictor
Joined: 26 Feb 2007 Posts: 17633 Location: Oberhessen, Germany / Maidstone ('95-'96)
Expire: 2013-12-03
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Posted: Thu Mar 11, 2010 2:07 pm Post subject: |
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LucisPictor wrote:
kansalliskala wrote: |
Thank you No-X, this is actually very good news for me!
Now I just need to hack some software ..
It is way easier than hacking the sensor. |
I don't know. I guess "hacking" a sensor is easier but also has worse consequences. _________________ Personal forum activity on pause every now and again (due to job obligations)!
Carsten, former Moderator
Things ON SALE
Carsten = "KAPCTEH" = "Karusutenu" | T-shirt?.........................My photos from Emilia: http://www.schouler.net/emilia/emilia2011.html
My gear: http://retrocameracs.wordpress.com/ausrustung/
Old list: http://forum.mflenses.com/viewtopic.php?t=65 (Not up-to-date, sorry!) | http://www.lucispictor.de | http://www.alensaweek.wordpress.com |
http://www.retrocamera.de |
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kansalliskala
Joined: 19 Jul 2007 Posts: 5039 Location: Southern Finland countryside
Expire: 2016-12-30
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Posted: Thu Mar 11, 2010 3:19 pm Post subject: |
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kansalliskala wrote:
Actually I already downloaded DCRaw source. Program is not very difficult .. but then I should understand the algorithm also ..
Or just change something and see if I get b&w or some caleidoscopic effect. _________________ MF: Kodak DCS SLR/c; Samsung NX10; OM-10; Canon T50
Zuiko 28/3.5, Distagon 35/2.8; Yashica ML 50/2;
Zuiko 50/1.4; S-M-C 120/2.8; Zuiko 135/3.5; 200/5;
Tamron AD1 135/2.8, Soligor 180/3.5; Tamron AD1 300/5.6
Tamron zooms: 01A, Z-210
Yashicaflex C; Київ 4 + Юпитер 8, 11; Polaroid 100; Olympus XA; Yashica T3
Museum stuff: Certo-Phot; Tele-Edixon 135; Polaris 90-190; Asahi Bellows; Ixus IIs
Projects: Agfa Isolette III (no shutter), Canon AE-1D (no sensor),
Nikon D80 (dead), The "Peace Camera"
AF: Canon, Tokina, Sigma Video: JVC GZ-MG275E |
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