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Example Pentax FA50/1.4
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Kamerer



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Joined: 24 Jun 2008
Posts: 116
Location: Russia Moscow
PostPosted: Fri Jul 04, 2008 3:00 pm    Post subject: Example Pentax FA50/1.4 Reply with quote

body Pentax Ist DL
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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 (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: MZ-7, IstDL (FA50/1.4, F28-80, FA80-320)
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My texts are translated by the electronic translator. Best regards, Sergey.
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poilu



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PostPosted: Fri Jul 04, 2008 3:36 pm    Post subject: Reply with quote
superb result in challenging condition!
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Orio



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PostPosted: Fri Jul 04, 2008 4:38 pm    Post subject: Reply with quote
Interesting result, almost film-like.
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Attila



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Joined: 24 Feb 2007
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PostPosted: Fri Jul 04, 2008 4:48 pm    Post subject: Reply with quote
Strange to me like a cheap lens.
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Olympus E-1,Nikon FA,Pentax MX,Praktica VLC3,Olympus-OM2N,Yashica Eletro 35 GN,Exakta Varex IIb,
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Carl Zeiss Jena:Flektogon 2.8/20mm,4/25mm,2.4/35,2.8/65mm,4.5/4cm Tessar
Pancolar 1.4/55mm,1.8/50mm,1.8/80mm,Tessar 2.8/50mm,Biotar 2/58mm,1.5/75mm,1.5/7,5cm
Carl Zeiss: Sonnar 2.8/135,2.8/180mm,Tessar 4/135mm
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Olympus OM: 3.5/18mm,3.5/21mm,1.4/50mm,3.5/55mm macro,2.8/135mm,2/90mm macro,35-70mm,60-250mm
Meyer: 4.5/35mm Primagon,Primoplan 1.9/58mm,1.9/75mm,2.8/100mm,Orestegor 2.8/135mm,4.5/40 Helioplan

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zewrak



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Joined: 12 Apr 2008
Posts: 673
PostPosted: Fri Jul 04, 2008 4:53 pm    Post subject: Reply with quote
If that had been shot with a new Pentax lens, it would all have been purple. I dunno what went wrong. But FA and later seem to always CA. Some of the newer are alot worse.

http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/14450-35-2-purple-fringing.html

For example. It's sad.
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Riku



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PostPosted: Fri Jul 04, 2008 5:05 pm    Post subject: Reply with quote
Attila wrote:
Strange to me like a cheap lens.


I compared my FA 50/1.4 with Rikenon 50/1.4. Rikenon has much less purple fringing and lower contrast wide open.
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lahnet



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Joined: 10 Apr 2007
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PostPosted: Fri Jul 04, 2008 5:05 pm    Post subject: Reply with quote
I like it Smile

Also quite interesting, where is it shot..?
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Attila



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PostPosted: Fri Jul 04, 2008 5:15 pm    Post subject: Reply with quote
Riku wrote:
Attila wrote:
Strange to me like a cheap lens.


I compared my FA 50/1.4 with Rikenon 50/1.4. Rikenon has much less purple fringing and lower contrast wide open.

This is a shame even if I well know Rikenon are good lenses.
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Carl Zeiss Jena:Flektogon 2.8/20mm,4/25mm,2.4/35,2.8/65mm,4.5/4cm Tessar
Pancolar 1.4/55mm,1.8/50mm,1.8/80mm,Tessar 2.8/50mm,Biotar 2/58mm,1.5/75mm,1.5/7,5cm
Carl Zeiss: Sonnar 2.8/135,2.8/180mm,Tessar 4/135mm
Nikon: 3.5/20mm,2.8/28mm,1.4/35mm,1.4/50mm,1.2/50mm,2/50mm,1.8/105mm,2.5/105mm,2.8/180mm,4/200mm macro,4.5/300mm
Pentax: Pentax 1.2/50mm,1.8/85mm,4/200mm
Helios: Helios-40 1.5/8,5cm,Helios-44-1 2/58mm,Helios-44-2 2/58mm
Olympus OM: 3.5/18mm,3.5/21mm,1.4/50mm,3.5/55mm macro,2.8/135mm,2/90mm macro,35-70mm,60-250mm
Meyer: 4.5/35mm Primagon,Primoplan 1.9/58mm,1.9/75mm,2.8/100mm,Orestegor 2.8/135mm,4.5/40 Helioplan

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F16SUNSHINE



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Joined: 20 Aug 2007
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PostPosted: Fri Jul 04, 2008 5:17 pm    Post subject: Reply with quote
It does have an interesting quality. It is oddly flat for such a shot. I think an old Super Tak would produce a nicer personality. Wink
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Riku



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Joined: 23 May 2007
Posts: 445
Location: Finland
PostPosted: Fri Jul 04, 2008 5:27 pm    Post subject: Reply with quote
zewrak wrote:
If that had been shot with a new Pentax lens, it would all have been purple. I dunno what went wrong. But FA and later seem to always CA. Some of the newer are alot worse.

http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/14450-35-2-purple-fringing.html

For example. It's sad.


Isn't purple fringing partly because of the sensor? This lens was designed before digital SLR's. Why would newer lenses be worse? Confused
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zewrak



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Joined: 12 Apr 2008
Posts: 673
PostPosted: Fri Jul 04, 2008 7:38 pm    Post subject: Reply with quote
Riku wrote:
zewrak wrote:
If that had been shot with a new Pentax lens, it would all have been purple. I dunno what went wrong. But FA and later seem to always CA. Some of the newer are alot worse.

http://www.pentaxforums.com/forums/pentax-slr-lens-discussion/14450-35-2-purple-fringing.html

For example. It's sad.


Isn't purple fringing partly because of the sensor? This lens was designed before digital SLR's. Why would newer lenses be worse? Confused


Perhaps the new factories are worse at making the lenses. My Super Takumars and SMC-M lenses are far better with CA then the newer Pentax lenses.
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Kamerer



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Joined: 24 Jun 2008
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Location: Russia Moscow
PostPosted: Sat Jul 05, 2008 3:46 am    Post subject: Reply with quote
lahnet wrote:

Also quite interesting, where is it shot..?

Ukraine, Kiev, seems the Vladimir Cathedral.
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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 (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: MZ-7, IstDL (FA50/1.4, F28-80, FA80-320)
FED-35A
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey.
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Kamerer



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PostPosted: Sat Jul 05, 2008 3:52 am    Post subject: Reply with quote
F16SUNSHINE wrote:
It does have an interesting quality. It is oddly flat for such a shot. I think an old Super Tak would produce a nicer personality. Wink

I tried earlier objective SMC Pentax-M 50/1.4, it on sharpness on a film on the open aperture has conceded FA50/1.4. It is known, that Pentax has changed calculation of the optical scheme for objectives A/F/FA50/1.4 that has made their sharper. Scheme Takumar 50/1.4 is identical Pentax K/M50/1.4. On figure it most likely is less appreciable, while the matrix will not be 24*36mm.
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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 (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: MZ-7, IstDL (FA50/1.4, F28-80, FA80-320)
FED-35A
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey.
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Kamerer



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Joined: 24 Jun 2008
Posts: 116
Location: Russia Moscow
PostPosted: Sat Jul 05, 2008 3:54 am    Post subject: Reply with quote
Riku wrote:

Isn't purple fringing partly because of the sensor?


I too so think, that the violet aura has appeared because of a matrix, on a film such I did not see. And can because of Bayer? Smile
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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 (M28/2.8, M40/2.8, K55/1.8, M100/2.8, M150/3.5),
Pentax AF: MZ-7, IstDL (FA50/1.4, F28-80, FA80-320)
FED-35A
Scaner Nikon LS-2000
My texts are translated by the electronic translator. Best regards, Sergey.
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nemesis101



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Joined: 25 Mar 2008
Posts: 265
Location: Oregon USA
PostPosted: Sat Jul 05, 2008 8:08 pm    Post subject: CA Fringing Reply with quote
I suspect that this might be an artifact of the angle at which the light hits the sensor. As each light sensitive element is in a small 'pit' only light heading directly vertical to the photosite will register correctly.

Angled light will hit the senor obliquely or not at all?

Film is essentially 'flat' and thus has less of a problem. Of course the FA 1.7 was designed for 35mm film not digital, and digital lenses are designed for the smaller sensor and to take into account the angle of incidence issues?

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.

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...
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