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stingOM
Joined: 27 Sep 2007
Posts: 3168
Location: Ireland
Expire: 2012-12-27
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 Posted: Fri Nov 18, 2011 5:30 pm Post subject: Help please - My Contax 90mm f2.8 G lens problem |
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stingOM wrote:
Hi Folks,
Got my lens today. It is in stunning condition, except for one seriously concerning thing. You can see that at wide open aperture, the aperture control ring is not pointing at f2.8. In fact when you stopped down to f22, the aperture ring goes far beyond f22. It is just not possible to twist the ring back to f2.8, it just does not line up. There is no evidence of someone doing a DIY repair on this lens.
Should I be worried as I am going to use it on digital bodies anyway? However I paid over €120 for it from a reputable UK store.
http://forum.mflenses.com/bought-my-first-contax-zeiss-g-lens-t44478.html
Any idea??
Thanks  |
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youngcoby
Joined: 02 Oct 2009
Posts: 43
Location: Antwerp, Belgium
Expire: 2013-12-18
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| Posted: Fri Nov 18, 2011 5:45 pm Post subject: |
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youngcoby wrote:
Hi,
don't worry about that: the aperture ring is a part of the lens mount on a G system. Once you put the lens to the body, the aperture ring will show the correct aperture.
I don't know what happens if you put it on a digital body with an adapter, sorry
Filip
_________________
Digital cams: Pentax K5, Pentax K200D, Canon 10D (mf), Nikon D80 (af), Olympus SP570UZ, Olympus C70 (C7000)
Takumar: 24/3.5 - 28/3.5 - 35/3.5 - 50/1.4 - 55/1.8 - 85/1.9 - 105/2.8 - 135/2.5 - 135/3.5 - 200/4.0
Carl Zeiss T*: Distagon 28/2.8 MM - Tessar 45/2.8 MM - Planar 100/2 MM - Sonnar 40-80/3.5 AE
Jupiter: 37A - Meyer Orestegor 200/4.0
Coming up for sale:
Leica R: Summicron 35/2 - Summicron 50/2 - Elmarit 135/2.8 - Elmarit 180/2.8
C/Y Carl Zeiss T*: Distagon 35/2.8 AE - Planar 50/1.4 AE - Planar 50/1.7 MM - Sonnar 135/2.8 MM - Sonnar 180/2.8 AE
C/Y Yashica ML: 24/2.8 - 28/2.8 - 35/2.8 - 50/1.4 - 50/1.7 - 50/1.9 - 50/2.0 - 55/2.8 (macro) - 55/4.0 (macro) - 135/2.8 - 200/4.0 - 300/5.6 - 80-200/4.0
C/Y Kiron: 105/2.8 (macro) - 28-210/4-5.6 zoom; Tokina: 80-200/4.0
M42: Jupiter: 9 - 11A - 21M; Helios: 44-4; Mir: 1b; Mamiya SX: 35/2.8 - 50/2.0 - 55/1.8 - 135/2.8; Petri: 28/2.8
Nikon: 24/2.8 - 28/3.5 - 105/2.5 - Vivitar: 100/3.5 macro
QBM Rollei: 50/1.8 - Sonnar 85/2.8;
Minolta: 50/1.7 - Vivitar: 28/2.8 Close focus
Tamron Adaptall: 300/5.6;
P6: Volna 3 |
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stingOM
Joined: 27 Sep 2007
Posts: 3168
Location: Ireland
Expire: 2012-12-27
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| Posted: Fri Nov 18, 2011 5:51 pm Post subject: |
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stingOM wrote:
H Filip,
I think you are onto something there. Take a look at this photo here.
Click here to see on Ebay
When the lens is off the camera body (I see two pins on the lens mount), perhaps the aperture ring is locked at the near f11 position and it will twist back into place when mated with the G1 or G2 film camera.
This is very very unusual to me...I have handled many lenses, but never seen one like this before. |
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std
Joined: 09 Feb 2010
Posts: 1827
Location: Bulgaria
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| Posted: Fri Nov 18, 2011 5:53 pm Post subject: |
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std wrote:
Don't worry your sonnar is perfectly fine.
You just need to mount it onto adapter and it will be OK.
_________________
Stefan
My lens list:
SLR MD: Rokkor 1,7/50 Exakta: Kilfitt-Makro-Kilar E 3.5/4cm; CZJ 2/50 Pancolar;M42: CZJ 2.8/50 Tessar; Mir-1B 2.8/37; Jupiter-9 2/85 T-mount: Tamron 5.9/200; Tamron 6.9/300; Tamron 7.5/400 C-mount: Cosmicar 1.8/50 Y/S: Sun 3.5/38-90, Sun 4/70-210 RF Contax RF: Jupiter-8 2/50; Contax G:CZ 2,8/21 Biogon T; CZ 2,8/28 Biogon T; CZ 2/35 Planar T; CZ 2/45 Planar T; CZ 2,8/90 Sonnar T |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Fri Nov 18, 2011 5:54 pm Post subject: |
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Orio wrote:
It's normal, your lens is perfect. Enjoy it.
_________________
Orio, Administrator
T*
NE CEDE MALIS AUDENTIOR ITO
Ferrania film is reborn! http://www.filmferrania.it/
Support the Ornano film chemicals company and help them survive!
http://forum.mflenses.com/ornano-chemical-products-t55525.html |
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youngcoby
Joined: 02 Oct 2009
Posts: 43
Location: Antwerp, Belgium
Expire: 2013-12-18
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| Posted: Fri Nov 18, 2011 6:00 pm Post subject: |
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youngcoby wrote:
Hi Sting,
I just checked my copy: when off the body, aperture says "11" and is wide open. When turning the ring to, and further than 22, aperture stops down.
When I mount my copy to a contax G1/G2 body, aperture is OK: showing 2.8, being 2.8. When I stop down to 22, it really closes down to 22.
I conclude that the aperture ring (for the contax bodies), is a part of mounting the lens. When the lens is off the body, the aperture ring twists/shifts to another aperture number, without closing down the diafragm.
Unfortunately, I don't have any experience with using them on other (digital) bodies, so I don't know if the available adapters use the same system as the contax bodies (showing the correct aperture number)
Kind regards,
Filip
_________________
Digital cams: Pentax K5, Pentax K200D, Canon 10D (mf), Nikon D80 (af), Olympus SP570UZ, Olympus C70 (C7000)
Takumar: 24/3.5 - 28/3.5 - 35/3.5 - 50/1.4 - 55/1.8 - 85/1.9 - 105/2.8 - 135/2.5 - 135/3.5 - 200/4.0
Carl Zeiss T*: Distagon 28/2.8 MM - Tessar 45/2.8 MM - Planar 100/2 MM - Sonnar 40-80/3.5 AE
Jupiter: 37A - Meyer Orestegor 200/4.0
Coming up for sale:
Leica R: Summicron 35/2 - Summicron 50/2 - Elmarit 135/2.8 - Elmarit 180/2.8
C/Y Carl Zeiss T*: Distagon 35/2.8 AE - Planar 50/1.4 AE - Planar 50/1.7 MM - Sonnar 135/2.8 MM - Sonnar 180/2.8 AE
C/Y Yashica ML: 24/2.8 - 28/2.8 - 35/2.8 - 50/1.4 - 50/1.7 - 50/1.9 - 50/2.0 - 55/2.8 (macro) - 55/4.0 (macro) - 135/2.8 - 200/4.0 - 300/5.6 - 80-200/4.0
C/Y Kiron: 105/2.8 (macro) - 28-210/4-5.6 zoom; Tokina: 80-200/4.0
M42: Jupiter: 9 - 11A - 21M; Helios: 44-4; Mir: 1b; Mamiya SX: 35/2.8 - 50/2.0 - 55/1.8 - 135/2.8; Petri: 28/2.8
Nikon: 24/2.8 - 28/3.5 - 105/2.5 - Vivitar: 100/3.5 macro
QBM Rollei: 50/1.8 - Sonnar 85/2.8;
Minolta: 50/1.7 - Vivitar: 28/2.8 Close focus
Tamron Adaptall: 300/5.6;
P6: Volna 3 |
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stingOM
Joined: 27 Sep 2007
Posts: 3168
Location: Ireland
Expire: 2012-12-27
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| Posted: Fri Nov 18, 2011 6:00 pm Post subject: |
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stingOM wrote:
Thanks folks. I still naive when it comes to Contax G lenses!  |
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