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Can't focus on infinity

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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 14:02
Yes went to house paid cash after trying it indoors as it was pitch black outside at the time.
Tried it a few times on birds in the garden but not at infinity/distance until yesterday where it wouldnt focus further than 12 m/40ft
 



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pegelli View Drop Down
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Post Options Post Options   Quote pegelli Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 14:28
According to the M Hohner calculator extension for a 400 mm lens at 12 meter is 14 mm, so I can't imagine it's the adapter that is "too long". So it's indeed a lens problem
Mind the bandwidth of others, don't link pictures larger then 1024 wide or 960 pix high, see here
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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 14:37
My worst fears.
Any idea how much to rectify if it is indeed a botched clean up/repair job?
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neilt3 View Drop Down
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Post Options Post Options   Quote neilt3 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:13
One or more of the lens elements have been put in back to front ,

OR

When it was put together the focus helicoid was started in the wrong position and it can't turn to infinity .

Either way it needs a professional service .

It's not necessary a DIY job as you won't know which piece is in wrong .
see my photostream on flickr;
http://www.flickr.com/photos/neilt3/
C & C welcome.
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:26
well if one can get hold of the manual (I don't mean user manual) for the lens it **may** be just about possible to work it out.
Older tele-lenses were less complex, fixed one myself few years back.

Sigma may fix it for free if you are very very lucky. They have a workshop in the UK. They have a very good customer service from what I hear and I have known people to have had their out warranty lenses fixed for free for minor issues.
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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:32
oh dear thought as much with the way this thread was going unfortunately
thanks for all your time and effort
I'll either
1) sell it for spares or repairs
2) find a camera shop in the future and find out how much to sort
3) message Sigma
 



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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:33
Now that's an idea
I'll try and message Sigma just now and find out what if anything they can do for me
cheers
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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:40
Originally posted by stuartmayo56 stuartmayo56 wrote:

oh dear thought as much with the way this thread was going unfortunately
thanks for all your time and effort
I'll either
1) sell it for spares or repairs
2) find a camera shop in the future and find out how much to sort
3) message Sigma


I'd do this in reverse order
my flickr
A7RIV
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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 15:42
haha yes true

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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 16:29
Just messaged Sigma and this is their reply -
I am sorry you are experiencing problems with your lens, it sounds like it requires a repair. Unfortunately due to it's age we do not have parts and are unable to carry out an effective repair. It may be worth checking on the internet for an independent repairer who may have the same lens that they could use the parts from to repair yours.

That's going to be my next port of call but it may be some time
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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 17:30
You'll never believe it ... I thought to myself that I should put the lens away until it can be sorted and I struggled slightly to push the lens hood back down so sort of twisted it like a screw and all of a sudden the front element came away in my hand!
I put it back together and tried it and now it is focusing to infinity or at least as far as I can see lol .....can't believe it!!!!!
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Post Options Post Options   Quote owenn01 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 17:42
One of life's little happy accidents - don't knock it (literally as well as figuratively); if it had been me then I wouldn't have got the lens back on again!

Hope it all goes okay and good luck with it!

Best regards, Neil
My Mantra: "Comment on other's work as you would wish to have yours commented upon". Go on - it's fun!
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stuartmayo56 View Drop Down
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Post Options Post Options   Quote stuartmayo56 Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 17:46
Yes lol I'm so relieved you can't imagine!
Thank you and thank you to everyone who gave advice
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 05 June 2020 at 17:49
Originally posted by stuartmayo56 stuartmayo56 wrote:

Just messaged Sigma and this is their reply -
I am sorry you are experiencing problems with your lens, it sounds like it requires a repair. Unfortunately due to it's age we do not have parts and are unable to carry out an effective repair. It may be worth checking on the internet for an independent repairer who may have the same lens that they could use the parts from to repair yours.

That's going to be my next port of call but it may be some time


I expected better from Sigma. Sounds like a standard copy-paste answer from their answers catalogue for old lens queries.
Its fairly clear that no part are needed, and that it just required an engineers attention to fits the elements or interiors properly in their rightful place.

Originally posted by stuartmayo56 stuartmayo56 wrote:

You'll never believe it ... I thought to myself that I should put the lens away until it can be sorted and I struggled slightly to push the lens hood back down so sort of twisted it like a screw and all of a sudden the front element came away in my hand!
I put it back together and tried it and now it is focusing to infinity or at least as far as I can see lol .....can't believe it!!!!!


But I am glad it got fixed albeit accidentally
Hope you enjoy using it and we look forward to seeing some picture from it
my flickr
A7RIV
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