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Drain Pipe help sigma 70-210mm f2.8

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sampler_one View Drop Down
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Post Options Post Options   Quote sampler_one Quote  Post ReplyReply Direct Link To This Post Topic: Drain Pipe help sigma 70-210mm f2.8
    Posted: 24 June 2016 at 07:14
I have a Sigma 70-210 F2.8 with some haze. I have managed to strip it down to the lens that need cleaning But I cannot figure out how to remove it. Any help would be great !
see my Photos.
all I need is a pointer.

Regards ![IMG][/IMG][IMG][/IMG]



Edited by sampler_one - 25 June 2016 at 03:43
 



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thornburg View Drop Down
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Post Options Post Options   Quote thornburg Quote  Post ReplyReply Direct Link To This Post Posted: 24 June 2016 at 13:48
I have no experience with disassembly of that specific lens, but I have a few thoughts:

1) Haze is not always cleanable -- if it was caused by fungus, it may have etched the glass, it could also be separation, in which case the fused elements need to be completely separated, cleaned, and re-cemented, there are other potential causes too

2) This is probably obvious, but in case it's "too" obvious, did you try holding the lens barrel and rotating that entire assembly containing that element? Many lenses have blocks that connect using threaded sections (like metal pipes).

3) Good luck!
Sony a3000, a6000, a57, a99 - Sony E 16-50, 28/2 | Vivitar 13, 85 | Minolta 24, 28-105, 35-105, 50/1.7, 75-300 | Tokina 28-70/2.6-2.8 | Sigma 70/2.8 Macro | Tamron 70-200/2.8 | Celestron 1000/11
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sampler_one View Drop Down
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Post Options Post Options   Quote sampler_one Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 03:45
I found all the secrets to a Sigma 70-210mm F2.8 APO.

See my Video here. Hope its helps someone.
https://youtu.be/j9ajSvBDtZg?list=PLuP_MLa4EGmuOXr2jJFOzGmVgUa9n7PPU
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beeton View Drop Down
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Post Options Post Options   Quote beeton Quote  Post ReplyReply Direct Link To This Post Posted: 26 June 2020 at 01:58
O.K. disassembled the lens completely including the font (inner) element group BUT now that ots together....soft images so I believe I have the inner element group wrong (may have turned one element around). Does anyone have an image of the inner group orientation?
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