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smokey
Joined: 01 Jul 2010
Posts: 8
Location: yes
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 Posted: Tue Jul 27, 2010 8:29 pm Post subject: Zeiss Sonnar 3.5/135 problem |
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smokey wrote:
Hey,
my first MF lens was a Zeiss Sonnar 3.5/135. I heard great things about it and - understandably - was quite enthused when it arrived. It is also quite sharp so I could not complain.
Later though I stumbled across some hidden flaw which I still can not explain. The bokeh looks like crap! The lenses are clear, there are no scratches on them. So what is it?
My current guess is some inner element has a flaw or is possibly under strain. Any guesses? |
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fatdeeman
Joined: 13 Jun 2009
Posts: 780
Location: UK
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| Posted: Tue Jul 27, 2010 9:29 pm Post subject: |
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fatdeeman wrote:
Does it happen all the time or just under extreme circumstances such as this? I find a lot of my lenses that appear clean give this effect with very OFF highlight bokeh, it's normally tiny bits of dust that you can barely even see with the naked eye but get enlarged a lot in the bokeh.
The distortions towards the bottom could possible be over tensioning but the long thin piece and the orbs are certainly tiny pieces of debris IMO
I wouldn't worry about it if it only happens in rare circumstances and if it was a really fantastic photo I suppose you could clone it out in a few minutes.
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- Dave
www.lensporn.net
www.flickr.com/photos/fatdeeman/
DSLR: Canon EOS 60D, Samsung GX-1S (Pentax *ist DS2)
Mirrorless: Panasonic DMC-G1, Sony NEX-5N
Compact: Canon PowerShot G3
Lenses:
Wide: Tokina RMC 28mm F/2.8, Tamron Adaptall 2 28mm F/2.5, Sun Optical 28mm F/2.5, Super paragon 28mm F/2.8, Sigma filtermatic 24mm F/2.8, Fujinon 35mm F/2.8, Sun Optical 35mm F/2.8
Standard: Industar 50-2, Helios 44-2, Helios 44M, Helios 44M-3, Pentax-M 50mm F/1.4, Pentax-M 50mm F/1.7, Pentax-M 50mm F/2, Ricoh 50mm F/1.7, Chinon 50mm F/1.7
Tele: Pentacon 135mm F/2.8, Pentacon 200mm F/3.5, Optomax 200mm f/3.5, Sun Optical 135mm F/3.5, Soligor 350mm F/5.6
Zoom: Tokina 28-70mm f/3.5-4.5 SZ-X270 SD, Sigma Zoom Pi 35-200mm F4-5.6, Sun Optical 28-80mm F/3.5-4.5, Sunagor 80-205mm F/3.8, Tokina RMC 80-200mm F/4, Vivitar 70-150mm F/3.8, Tamron 95-205mm F/6.3, Tamron Adaptall 28-200mm F/3.8-5.6 LD Aspherical, Tokina RMC 70-210mm F/3.5
Mirror: Falcon (Samyang) 800mm F/8, MTO-11CA 1000mm F/10, Tamron Adaptall 2 500mm F/8
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smokey
Joined: 01 Jul 2010
Posts: 8
Location: yes
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| Posted: Tue Jul 27, 2010 9:55 pm Post subject: |
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smokey wrote:
The dust is no problem. The long streak is in every reflection regardless of size. If you have 100s of bokeh-rings you also have 100 streaks across them. This is always present, except when taking images without unsharp highlights. Very irritating.
Another example:
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woodrim
Joined: 14 Jan 2010
Posts: 4060
Location: Charleston
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| Posted: Tue Jul 27, 2010 11:16 pm Post subject: |
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woodrim wrote:
Love the picture, but I agree that those streaks are a problem. I would check the rear element for something like oil streaks on the inside surface.
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Woodrim |
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Himself
Joined: 01 Mar 2007
Posts: 3215
Location: Montreal
Expire: 2013-05-30
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| Posted: Wed Jul 28, 2010 12:42 am Post subject: |
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Himself wrote:
Awesome picture!
+1 what Woodrim said. |
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smokey
Joined: 01 Jul 2010
Posts: 8
Location: yes
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| Posted: Wed Jul 28, 2010 9:52 am Post subject: |
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smokey wrote:
I just checked again, no signs of oil what so ever. A few dust grains between the lenses but that can not account for the streak.
Lens under stress or some micro-ridge in a lens are the possible explanations now left. Sigh. |
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