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Oldhand
Joined: 01 Apr 2013
Posts: 4321
Location: Mid North Coast NSW - Australia
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 Posted: Sat Apr 14, 2018 11:38 pm Post subject: |
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Oldhand wrote:
| blotafton wrote: |
| Oldhand wrote: |
Is there a problem with your lens mounts. Neither of those images looks right to me at any aperture.
I find it hard to believe that both of your lenses could be defective in some way
Tom |
These are crops from the left side, with the center in focus. Taken with my Sony A7 so full frame. There is nothing obvious wrong with the lenses. I'm not sure what's up. |
Yes a puzzle to me too
Tom |
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blotafton
Joined: 08 Aug 2013
Posts: 604
Location: Sweden
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| Posted: Sun Apr 15, 2018 3:06 pm Post subject: |
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blotafton wrote:
Off topic but.
My image posts with a Zuiko 55 1.2, Prakticar 50 1.4, Meyer 50 1.8 and Riconar 55 2.2 also got comments that they were defective.
It must be something else than the lenses. |
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calvin83
Joined: 12 Apr 2009
Posts: 6057
Location: Hong Kong
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| Posted: Sun Apr 15, 2018 3:48 pm Post subject: |
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calvin83 wrote:
A lens can perform differently on sensor size and different magnification. Sometime, the use of a proper hood and lighting conditions may have significant impact on the photo. The lens may look defective to one but not the others.
_________________
My Flickr on street photography
List of Rodenstock Interchangeable Lenses for 35mm cameras with Serial Numbers
The best lens is the one you have with you. Life is too short to let us try every lens!
M42: Pentax 2.0/35 V1, CZJ Tessar 4.5/4cm, CZ Ultron 1.8/50, Tomioka 1.2/55 & 2.8/60, Enna 1.5/85 & 2.8/90 ...
Exakta: Angenieux 2.5/35 R1 & 2.5/90 Y12, Quinaron 2.8/35, Quinar 3.5/100, Tele-Quinar 2.8/135, RE. Auto-Topcor 4/20, 1.8/58, 1.8/85 ...
Retina S/DKL: Eurygon 2.8/30 and 4/35, Quinon 1.9/50, Heligon 1.9/50, Ysarex 2.8/50, Rotelar 4/85 and 4/135 ...
Enlargers: Hexar 3.5/75, Meopta 4.5/135, Helioplan 4,5/135, Travegar 3.5/105, Trylor 135mm F4.5 and more
RF: CZ Sonnar T 50/1.5, Jupiter 9 Zorki 1951 LTM, Canon 50/1.5 and 100/2.0
MC/MD: Minolta MD 35/1.8, 200/2.8, 500/8, Vivitar 2.5/90 Macro
FD: Komura 4/24, Vivitar 2.3/135, Canon 2.8/24 S.S.C & 4/200 Macro
Others: Agfa 90/3.4, Prakticar 1.8/80, Schneider SL-Angulon 35/2.8, Rollei HFT 2.8/135, Ross 3.5/91, KMZ PO3-3M 2/50, Zeika 25/0.95, Sun 75mm F1.9, Kern 1.8/50 Macro and much more ...
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stevemark
Joined: 29 Apr 2011
Posts: 785
Location: Switzerland
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| Posted: Sun Apr 15, 2018 6:18 pm Post subject: |
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stevemark wrote:
| John Shriver wrote: |
On the other hand, the Sony a7 cameras like lenses with field curvature. All their lenses have field curvature to match the sensor. |
The lenses we're talking about look exactly the same on a Leica M9/M240 (extremely thin sensor glass) and the Sony A7 24MP series (2.5mm glass).
Stephan
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www.artaphot.ch |
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tb_a
Joined: 26 Jan 2010
Posts: 2524
Location: Austria
Expire: 2016-04-28
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| Posted: Tue Apr 24, 2018 11:08 am Post subject: |
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tb_a wrote:
| stevemark wrote: |
| John Shriver wrote: |
On the other hand, the Sony a7 cameras like lenses with field curvature. All their lenses have field curvature to match the sensor. |
The lenses we're talking about look exactly the same on a Leica M9/M240 (extremely thin sensor glass) and the Sony A7 24MP series (2.5mm glass).
Stephan |
Because I've changed my mind I've acquired a A7R2 recently and out of curiosity I've redone the comparison on my new FF camera as these lenses are still lying around...
Interestingly I've got exactly the same result as from my Ricoh APS-C camera; i.e. up to F4 the Takumar is better in the corners at same apertures and as from F4 the lenses aren't distinguishable anymore.
However, I've used proper lens hoods on both lenses and shot at lowest ISO from a sturdy tripod at highest resolution uncompressed RAW. Maybe the much higher resolution of the A7R2 in combination with the lack of the low-pass filter is the decisive factor here.
_________________
Thomas Bernardy
Manual focus lenses mainly from Minolta, Pentax, Voigtlaender, Leitz, Topcon and from Russia (too many to be listed here). |
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caspert79
Joined: 31 Oct 2010
Posts: 455
Location: The Netherlands
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| Posted: Tue Apr 24, 2018 2:17 pm Post subject: |
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caspert79 wrote:
@tb_a
Do you happen to have a Rikenon XR 50/2.0? I’m very curious how it performs on an A7II.
From tests with my E-pl5 it seems to be a strong performer. I’m curious about its corner performance. |
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tb_a
Joined: 26 Jan 2010
Posts: 2524
Location: Austria
Expire: 2016-04-28
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| Posted: Tue Apr 24, 2018 2:28 pm Post subject: |
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tb_a wrote:
| caspert79 wrote: |
@tb_a
Do you happen to have a Rikenon XR 50/2.0? I’m very curious how it performs on an A7II.
From tests with my E-pl5 it seems to be a strong performer. I’m curious about its corner performance. |
Sorry, although I have rather many lenses, I don't have any Rikenon.
_________________
Thomas Bernardy
Manual focus lenses mainly from Minolta, Pentax, Voigtlaender, Leitz, Topcon and from Russia (too many to be listed here). |
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adonuff
Joined: 24 Nov 2017
Posts: 34
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| Posted: Wed Apr 25, 2018 8:53 am Post subject: |
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adonuff wrote:
| calvin83 wrote: |
| A lens can perform differently on sensor size and different magnification. Sometime, the use of a proper hood and lighting conditions may have significant impact on the photo. The lens may look defective to one but not the others. |
I am sure you are correct, I have a Sony NEX 5t & A6000. I have noticed that the NEX's 16 meg pics are more vibrant & have more contrast when compared to the A6000 24 meg when using the same lens? I have checked several times to make sure both cameras have the same settings?
Both are equally as sharp & the quality of the photo's are good, just the A6000 looks a little bit washed out prior to any adjustments in Lightroom. After processing both end up almost the same. I have tested this a few times, same lighting, same subject, same lens just swapped cameras. It is not a problem, just an observation. |
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