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Terkild
Joined: 22 Jul 2014
Posts: 8
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 Posted: Tue Jul 22, 2014 5:09 pm Post subject: Aperture ring stuck on "A" (but blades working) |
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Terkild wrote:
Hi,
This is my first post on mflenses (i usually just read stuff here  ) so if I am missing some guidelines or posting in the wrong place, please let me know.
I have acquired a 28-70mm f/3.5-4.5 Sigma Zoom Lens for Canon FD. The lens works great but the aperture ring seems to be stuck on the wrong side of the "A" (not towards the aperture numbers: 22 16 11 etc.). I cannot seem to get the "button" down sufficient to turn the aperture ring back to the values no matter what i do.
If i push the "levers" on the back of the lens i can get the aperture blades to open and close with no problem, so they do not seem to be stuck. I can also move the ring a little bit (1mm) from side to side, so it is not the ring that is stuck per se. This makes me think that the "button" has somehow locked in the wrong place and won't release. Can anyone advise me on how i may solve this issue?
I really appreciate all the help you can give me, thanks in advance!
Best regards,
Terkild |
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philslizzy
Joined: 07 Aug 2012
Posts: 4748
Location: Cheshire, England
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| Posted: Tue Jul 22, 2014 7:13 pm Post subject: Re: Aperture ring stuck on "A" (but blades working |
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philslizzy wrote:
| Terkild wrote: |
Hi,
This is my first post on mflenses (i usually just read stuff here ) so if I am missing some guidelines or posting in the wrong place, please let me know.
I have acquired a 28-70mm f/3.5-4.5 Sigma Zoom Lens for Canon FD. The lens works great but the aperture ring seems to be stuck on the wrong side of the "A" (not towards the aperture numbers: 22 16 11 etc.). I cannot seem to get the "button" down sufficient to turn the aperture ring back to the values no matter what i do.
If i push the "levers" on the back of the lens i can get the aperture blades to open and close with no problem, so they do not seem to be stuck. I can also move the ring a little bit (1mm) from side to side, so it is not the ring that is stuck per se. This makes me think that the "button" has somehow locked in the wrong place and won't release. Can anyone advise me on how i may solve this issue?
I really appreciate all the help you can give me, thanks in advance!
Best regards,
Terkild |
Pics dont show on first post.
Does the lens have to be mounted on a camera or adapter first? I'm not an FD man myself but I have several lenses and they only seem to work when they're mounted...
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Hero in the 'messin-with-cameras-for-the-hell-of-it department'. Official. |
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Terkild
Joined: 22 Jul 2014
Posts: 8
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| Posted: Tue Jul 22, 2014 7:37 pm Post subject: Re: Aperture ring stuck on "A" (but blades working |
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Terkild wrote:
| philslizzy wrote: |
Pics dont show on first post.
Does the lens have to be mounted on a camera or adapter first? I'm not an FD man myself but I have several lenses and they only seem to work when they're mounted... |
I have mounted the lens on a native Canon camera and on a Nex adapter and dismounted it does not change the fact that i cannot turn the aperture ring. I have other canon FD lenses and they work fine on the adapter (and camera).
Good to know with the picture  |
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visualopsins
Joined: 05 Mar 2009
Posts: 10543
Location: California
Expire: 2025-04-11
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| Posted: Tue Jul 22, 2014 9:24 pm Post subject: |
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visualopsins wrote:
Try pressing that little button while turning the aperture ring...
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (51BB), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Terkild
Joined: 22 Jul 2014
Posts: 8
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| Posted: Wed Jul 23, 2014 5:39 am Post subject: |
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Terkild wrote:
| visualopsins wrote: |
| Try pressing that little button while turning the aperture ring... |
Thanks, but that is kinda the issue, I cannot press the button far enough down to enable the ring to move. |
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Terkild
Joined: 22 Jul 2014
Posts: 8
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| Posted: Sat Jul 26, 2014 2:41 pm Post subject: |
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Terkild wrote:
Noone has anymore suggestions on what i may do to fix the ring? |
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Sat Jul 26, 2014 3:47 pm Post subject: |
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Gardener wrote:
I've seen a ton of similar Sigmas, and build quality on these is pretty poor. Most likely something got inside the ring, or something got out of place, or something else of a similar sort. I'd suggest taking the mount off and cleaning aperture ring. |
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Terkild
Joined: 22 Jul 2014
Posts: 8
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| Posted: Sun Jul 27, 2014 2:32 pm Post subject: |
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Terkild wrote:
| Gardener wrote: |
| I've seen a ton of similar Sigmas, and build quality on these is pretty poor. Most likely something got inside the ring, or something got out of place, or something else of a similar sort. I'd suggest taking the mount off and cleaning aperture ring. |
Is there anything i should be aware of when taking the mount off? Is it difficult to put back together? |
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Gardener
Joined: 22 Sep 2013
Posts: 950
Location: USA
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| Posted: Sun Jul 27, 2014 5:11 pm Post subject: |
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Gardener wrote:
I don't think it's that difficult - just snap a few pics to have a reference of how it looked originally. Don't lose detent ball. |
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