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mores
Joined: 19 Mar 2012
Posts: 2
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 Posted: Mon Mar 19, 2012 3:40 pm Post subject: broken diaphragm on Canon FD 50mm 1.8, DIY? |
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mores wrote:
Hi all,
i recently found my parents Canon AE-1, but unfortunately the lens iris is blocked at maximum aperture.
I know these lenses usually do not permit to set the aperture while the lens is off camera. but even when the lens is mounted the dof preview switch doesn't work.. while it works with the FD 135 mm.
In conclusion i guess something is broken inside the lens.
Considering that a pro repair would cost at least 50$ and that is also the price you can buy online a used sample..
i was thinking it could be worth to try a DIY repair..what do you think?
i have read this post
[url=http://forum.mflenses.com/trying-to-unfungus-a-nice-canon-fd-50mm-1-8-t42412,highlight,+canon++fd.html]
Trying to unfungus a nice Canon FD 50mm 1.8[/url]
the lens is exactly the same, but now i have to face the diaphragm problem...
any tips more than welcome!
thanks |
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Attila
Joined: 24 Feb 2007
Posts: 57865
Location: Hungary
Expire: 2025-11-18
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| Posted: Mon Mar 19, 2012 9:55 pm Post subject: Re: broken diaphragm on Canon FD 50mm 1.8, DIY? |
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Attila wrote:
| mores wrote: |
Hi all,
i recently found my parents Canon AE-1, but unfortunately the lens iris is blocked at maximum aperture.
I know these lenses usually do not permit to set the aperture while the lens is off camera. but even when the lens is mounted the dof preview switch doesn't work.. while it works with the FD 135 mm.
In conclusion i guess something is broken inside the lens.
Considering that a pro repair would cost at least 50$ and that is also the price you can buy online a used sample..
i was thinking it could be worth to try a DIY repair..what do you think?
i have read this post
[url=http://forum.mflenses.com/trying-to-unfungus-a-nice-canon-fd-50mm-1-8-t42412,highlight,+canon++fd.html]
Trying to unfungus a nice Canon FD 50mm 1.8[/url]
the lens is exactly the same, but now i have to face the diaphragm problem...
any tips more than welcome!
thanks |
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Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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Lloydy
Joined: 02 Sep 2009
Posts: 7788
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Mon Mar 19, 2012 10:08 pm Post subject: |
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Lloydy wrote:
They are cheap, I paid £5 for a very clean one a few weeks ago. Now I have two, I forgot I already had one ! 
So, I guess it's worth a go at repairing. It'll be a learning curve.
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walter g
Joined: 20 Feb 2010
Posts: 2463
Location: NC, USA
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| Posted: Tue Mar 20, 2012 1:08 am Post subject: |
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walter g wrote:
http://forum.mflenses.com/trying-to-unfungus-a-nice-canon-fd-50mm-1-8-t42412,highlight,%2Btrying+%2Bunfungus+%2Bnice+%2Bcanon+%2Bfd.html
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Panasonic G5,Nikon J1,Pentax Q10,Sony Nex 6
Minolta MC W SI 2.5/28, MD 2.8/28, MC W SG 3.5/28, MC Celtic 3.5/28, MC W HG 2.8/35, MD Celtic 2.8/35, QE 4/35, Rokkor X 2/45, MC Rokkor X PG 1.4/50, MC Rokkor X PG 1.7/50, MD Rokkor X 1.7/50, MD 2/50, MC Rokkor PF 1.7/55, MC Rokkor PF 1.9/55, Auto Tele Rokkor PG 2.8/135, MC Tele Rokkor QD 3.5/135, TC 4/135, MC Celtic 4/200, MC Tele Rokkor PE 4.5/200
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martinsmith99
Joined: 31 Aug 2008
Posts: 6950
Location: S Glos, UK
Expire: 2013-11-18
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| Posted: Tue Mar 20, 2012 7:02 am Post subject: |
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martinsmith99 wrote:
Are you sure that it's not just sticky blades. That'll be worth trying to fix, but at the end of the day, they are cheap lenses.
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Casual attendance these days |
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mores
Joined: 19 Mar 2012
Posts: 2
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| Posted: Tue Mar 20, 2012 8:52 am Post subject: |
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mores wrote:
Hi all,
some updates:
i managed to extract the diaphragm, and the blades were blocked at full aperture. i unblocked them and the dof preview switch was working good.
but after taking a shot they got blocked again....it seems that when u push strongly and fast the lever to open the diaphragm the blades get stuck...
so i have 2 options now:
1-opening the diaphragm removing the 3 screws that keep all together-> but i think i will not be able to put it back together again
2-trying to lubricate it...
anyway up to now it has been a very instructive experience..
thanks to all
PS
if i can i will post some pictures |
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