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Kamerer
Joined: 24 Jun 2008
Posts: 124
Location: Russia Moscow
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 Posted: Sat Jul 05, 2008 9:23 pm Post subject: Re: CA Fringing |
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| nemesis101 wrote: |
I have a FA 1.7 however and notice little difference between the amount of CA with it, and the stock digital only zoom. Sharpness, colour rendition etc. are different, but the CA not noticeably so. |
If FA50/1.4 to use on 1/1,7-1/2 CA should be less, and on 1/1,4 FA50/1.7 to check up it is impossible. At me were M50/1.7 and A50/1.7, I have changed them on FA50/1.4 and K55/1.8 at which side it is pleasant more.
| nemesis101 wrote: |
I do however notice a great deal more CA on my beloved Adaptall-2 Tamron SP 70 -210 f3.5 when used on a digital body (K10D, *istD and *istDL) compared with any of my many many 35mm SLRs... |
Objective good, a matrix average. This picture is made on 1/1,4-1/1,7.
_________________
Kiev-15 (Mir-20A, Mir-1A, Helios-65, Helios-81, Jupiter-9A, Jupiter-11A, Granit-11, adapter M39+Industar-61LZ/39mm),
Pentax MF: KX, ME Super SE (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: Z-5p, K100D (FA50/1.4, F28-80, FA80-320)
Konica-35v, Kiev-4/J-8/J-12
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey. |
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Farside
Joined: 01 Sep 2007
Posts: 1877
Location: Ireland
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| Posted: Sun Jul 06, 2008 12:38 pm Post subject: |
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| Riku wrote: |
Isn't purple fringing partly because of the sensor?
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Hmm... energetic photons tending towards the ultra-violet end of things? Just makes a mess of the optical plan down at the surface of the sensor if they're overlapping several sensor sites and pinging around like pool balls.
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This lens was designed before digital SLR's. Why would newer lenses be worse?  |
Because 'new' doesn't always mean 'improved'. The newer lenses are manufactured to a much tighter cost regime than the old ones ever were and a bit of penny-pinching here and there wouldn't be noticed by the vast majority of buyers.
I'd guess the newer lenses have a smaller exit pupil and the angle of the light rays is more acute toward the edges of the sensor. If it's generally true that older lenses with a more uniform spread of light from the rear element cause less of this sensor bloom, then there might be something to this idea.
As ever, this idea is free and worth what it cost you.
_________________
Dave
The Lenses of Farside
"The largest threat to freedom, democracy, the market economy and
prosperity is no longer socialism. It is, instead, the ambitious,
arrogant, unscrupulous ideology of environmentalism."
-- Czech President Vaclav Klaus |
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Kamerer
Joined: 24 Jun 2008
Posts: 124
Location: Russia Moscow
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| Posted: Mon Jul 07, 2008 10:33 am Post subject: |
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In the same place other plot, FA50/1.4.
_________________
Kiev-15 (Mir-20A, Mir-1A, Helios-65, Helios-81, Jupiter-9A, Jupiter-11A, Granit-11, adapter M39+Industar-61LZ/39mm),
Pentax MF: KX, ME Super SE (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: Z-5p, K100D (FA50/1.4, F28-80, FA80-320)
Konica-35v, Kiev-4/J-8/J-12
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey. |
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Kamerer
Joined: 24 Jun 2008
Posts: 124
Location: Russia Moscow
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| Posted: Wed Jul 09, 2008 5:58 am Post subject: |
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_________________
Kiev-15 (Mir-20A, Mir-1A, Helios-65, Helios-81, Jupiter-9A, Jupiter-11A, Granit-11, adapter M39+Industar-61LZ/39mm),
Pentax MF: KX, ME Super SE (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: Z-5p, K100D (FA50/1.4, F28-80, FA80-320)
Konica-35v, Kiev-4/J-8/J-12
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey. |
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luisalegria
Joined: 07 Mar 2008
Posts: 990
Location: San Francisco, USA
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| Posted: Wed Jul 09, 2008 6:25 am Post subject: |
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I see the fringing, but the perceived flatness may be because of the very weird lighting in there, with a domed ceiling painted to appear flat through a very clever trompe l'oeil .
_________________
Pentax K100D, SV, SP1000, SP500, LX, SF10, Mamiya 1000TL, Sears/Ricoh TLS, Exakta VX, VXIIb, Olympus OM-10, Nikon FM, Zeiss Contaflex B, Retina Reflex S, IV, Rolleiflex, Speed Graphic & Meridian 4x5, misc. rangefinders and folders, several dozen lenses and etc., et. al., ad infinitum. |
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Nesster
Joined: 24 Apr 2008
Posts: 571
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| Posted: Wed Jul 09, 2008 10:42 am Post subject: |
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First off, thank you for the photos of a very interesting church.
I've noted my Takumar 50's can get CA, the SMC worse than the Super. The 55's aren't as prone, and the 43 Limited has least of all.
I have a theory that apart from the sensor angles of acceptance thing, there's something else going on. The lens designer has some freedom at the 'sharpness / snap' region of resolution, which is above the absolute resolution. I suspect this is also the resonance of sensors and film grain, similar size ranges. That is why a given lens will lock with either film, or a sensor, or prefer one sensor over another.
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Camera Fetishism:
http://www.flickr.com/photos/nesster/sets/72157601067248451/ |
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Kamerer
Joined: 24 Jun 2008
Posts: 124
Location: Russia Moscow
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| Posted: Wed Jul 09, 2008 12:11 pm Post subject: |
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_________________
Kiev-15 (Mir-20A, Mir-1A, Helios-65, Helios-81, Jupiter-9A, Jupiter-11A, Granit-11, adapter M39+Industar-61LZ/39mm),
Pentax MF: KX, ME Super SE (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: Z-5p, K100D (FA50/1.4, F28-80, FA80-320)
Konica-35v, Kiev-4/J-8/J-12
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey. |
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