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AF-MF
Joined: 24 Oct 2015
Posts: 3
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 Posted: Sun Oct 25, 2015 3:05 pm Post subject: Canon FD 300mm F4L aperture is always wide open |
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AF-MF wrote:
Hi. I've had this lens for some time now, bought it used and the aperture adjustment didn't work at all — it's always wide open. All my other FD lenses are closed down half way by default (when no rear cap is attached), and closed down to the smallest aperture when I attach a rear cap. But this 300/4 is always wide open: neither attaching the rear cap nor putting it on a camera/adapter makes the aperture blades move.
So at first I assumed it's oily blades that made the aperture stuck wide open, but then I've noticed that the mount looks a bit different than on my other FD lenses. Here's a photo of this 300/4 (the one on the left) compared to other 4 FD lenses:
It looks like it was rotated somehow, the red dots don't match like they do on all the other lenses. So this is probably somehow related to the aperture staying always wide open? Is there anything I can do to fix it? Any help is greatly appreciated! 
Last edited by AF-MF on Sun Oct 25, 2015 10:43 pm; edited 1 time in total |
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Lloydy
Joined: 02 Sep 2009
Posts: 7768
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Sun Oct 25, 2015 8:39 pm Post subject: Re: Canon FD 300mm F4L aperture is always wide open |
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Lloydy wrote:
| AF-MF wrote: |
Hi. I've had this lens for some time now, bought it used and the aperture adjustment didn't work at all — it's always wide open. All my other FD lenses are closed down half way by default (when no rear cap is attached), and closed down to the smallest aperture when I attach a rear cap. But this 300/4 is always wide open: neither attaching the rear cap nor putting it on a camera/adapter doesn't make the aperture blades move.
So at first I assumed it's oily blades that made the aperture stuck wide open, but then I've noticed that the mount looks a bit different than on my other FD lenses. Here's a photo of this 300/4 (the one on the left) compared to other 4 FD lenses:
It looks like it was rotated somehow, the red dots don't match like they do on all the other lenses. So this is probably somehow related to the aperture staying always wide open? Is there anything I can do to fix it? Any help is greatly appreciated!
Edit: seems like the forum blocks images in new users' posts, so the photo I've added doesn't show. It also blocks urls from new users, so I can't even add a link to the image hosting. That's unfortunate.  Here's the direct link "modified" a bit to pass the great firewall (two "y" instead of two "t"): hyyp://someimage.com/FNcnCIf |
Reposted to show pictures, it's a anti spam measure for first posts.
_________________
LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
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AF-MF
Joined: 24 Oct 2015
Posts: 3
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| Posted: Sun Oct 25, 2015 10:38 pm Post subject: |
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AF-MF wrote:
Thanks Lloydy! |
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Jesito
Joined: 24 Aug 2007
Posts: 5753
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Mon Oct 26, 2015 12:00 pm Post subject: |
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Jesito wrote:
I got two of them with this same problem. Sometimes wide open sometimes fixed f/5.6
I disassembled partially one of them but I couldn't figure out what was wrong...
I have to try it again.
In the meantime I use the Tamron 300 mm 
_________________
Jesito, Moderator 
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
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AF-MF
Joined: 24 Oct 2015
Posts: 3
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| Posted: Mon Oct 26, 2015 9:00 pm Post subject: |
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AF-MF wrote:
Thanks Jesito. I took a close look at the rear end of my lens, watched some youtube videos about FD lenses, and it seems like the mount was slightly rotated simply because I played with a rear cap on it before, and took the cap off at an angle.. I rotated it back to the normal position with my fingers and now it's where it's supposed to be, so that was nothing and had nothing to do with the aperture not working. Hence I'm back to square one.
You have two same lenses with the aperture not working - both 300 f4 L? If so, looks like it's a common issue with this lens. The only "manual" for this lens I've seen is this one (you've probably seen it too): http://www.bigeye.url.tw/big5/d_ca300_4.htm
But I've got 0 experience with lens repair, and this 300/4 is definitely not the easiest specimen to start experimenting with. |
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Jesito
Joined: 24 Aug 2007
Posts: 5753
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Tue Oct 27, 2015 4:54 pm Post subject: |
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Jesito wrote:
| AF-MF wrote: |
Thanks Jesito. I took a close look at the rear end of my lens, watched some youtube videos about FD lenses, and it seems like the mount was slightly rotated simply because I played with a rear cap on it before, and took the cap off at an angle.. I rotated it back to the normal position with my fingers and now it's where it's supposed to be, so that was nothing and had nothing to do with the aperture not working. Hence I'm back to square one.
You have two same lenses with the aperture not working - both 300 f4 L? If so, looks like it's a common issue with this lens. The only "manual" for this lens I've seen is this one (you've probably seen it too): http://www.bigeye.url.tw/big5/d_ca300_4.htm
But I've got 0 experience with lens repair, and this 300/4 is definitely not the easiest specimen to start experimenting with. |
I'm sorry, I misconfused the model. Mines are not the L model, but the simpler one.
On your pictures in the first post there were no side pictures, and I didn't notice the "L"...
Then maybe it's not so common failure.
In my experience, many faults come for lack of use, simply disassemblying and cleaning, many lenses come back to life.
I think Attila had a good repair man that could fix lenses at reasonable prices..
Good luck!
_________________
Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
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Lloydy
Joined: 02 Sep 2009
Posts: 7768
Location: Ironbridge. UK.
Expire: 2022-01-01
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| Posted: Tue Oct 27, 2015 8:17 pm Post subject: |
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Lloydy wrote:
I have a genuine Canon FD rear cap that I have cut the middle out of with a craft knife, it allows me to see into the back of the lens and the genuine cap acts like the camera mount and allows the aperture to be adjusted off the camera. It's very useful.
_________________
LENSES & CAMERAS FOR SALE.....
I have loads of stuff that I have to get rid of, if you see me commenting about something I have got and you want one, ask me.
My Flickr https://www.flickr.com/photos/mudplugga/
My ipernity -
http://www.ipernity.com/home/294337 |
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Jesito
Joined: 24 Aug 2007
Posts: 5753
Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
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| Posted: Wed Oct 28, 2015 1:10 pm Post subject: |
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Jesito wrote:
| Lloydy wrote: |
| I have a genuine Canon FD rear cap that I have cut the middle out of with a craft knife, it allows me to see into the back of the lens and the genuine cap acts like the camera mount and allows the aperture to be adjusted off the camera. It's very useful. |
Yes, you are right. I do the same with a Samsung to FD adapter, once the lens set into the adapter behaves like you say.
_________________
Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
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