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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 18 Apr 2012 (Wednesday) 23:00
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Help on tamron lens repair :(

 
skycolt
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Apr 18, 2012 23:00 |  #1

Hi all, I need help.
I recently bought a second hand tamron 18-270. I found the back element is dirty so I used ethanol to clean it. Big mistake, looks that the back element is reactive with ethanol and it's opaque now... I don't know what to do now... I don't have tamron warranty. Is that possible to find a broken lens of the same type and switch the back element?

I can't resist to find out what happening so I opened the lens. There is no liquid in the lens, I really ruined the back element. But meantime I find that this is really a small piece and easy to switch. Does anyone know that if I can find some alternative source of this back element?


Thanks


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skycolt
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Apr 18, 2012 23:32 |  #2

In case someone have similar problem, I found a link about DIY tamron service. I'll try to call their part department tomorrow asking if I can get the part and DIY it

http://thingsimdoing.w​ordpress.com …1/14/diy-slr-lens-repair/ (external link)


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ZoneV
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Apr 19, 2012 02:03 |  #3

Very bad! Wish you good luck!
But I have to admit that this find is interessting for me. Thought about that Tamron has a hybrid aspherical element at the back and this plastic is not chemical resistant enough.
But no, lens diagramm shows that aspheric element at the font behind to lenses:
http://www.lensrentals​.com …on-18-270-f3.5-6.3-vc-pzd (external link)

I wonder if that last element is made of plastic?


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watt100
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Apr 19, 2012 05:18 |  #4

ZoneV wrote in post #14291021 (external link)
But I have to admit that this find is interessting for me.

I wonder if that last element is made of plastic?

ethanol is alcohol and I've used alcohol to clean lens with no problems.
maybe it is plastic or something




  
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skycolt
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Apr 19, 2012 07:08 |  #5

update
quite surprised, I find the lens looks normal after a night... But I have to admit the image quality decreased a lot. What kind of problem it looks like? Did I not adjust the lens properly or I've ruined the back element? Do you guys suggest to MA myself or send it back to tamron?

Thanks


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skycolt
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Apr 19, 2012 07:10 |  #6

270mm f9, center crop


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skycolt
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Apr 19, 2012 07:21 |  #7

ZoneV wrote in post #14291021 (external link)
Very bad! Wish you good luck!
But I have to admit that this find is interessting for me. Thought about that Tamron has a hybrid aspherical element at the back and this plastic is not chemical resistant enough.
But no, lens diagramm shows that aspheric element at the font behind to lenses:
http://www.lensrentals​.com …on-18-270-f3.5-6.3-vc-pzd (external link)

I wonder if that last element is made of plastic?

not sure about plastic, but definitely not glass


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skycolt
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Apr 19, 2012 07:58 |  #8

Just asked for repair. $250 minor and $400 major, that sucks


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ZoneV
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Apr 19, 2012 10:17 |  #9

Yeah, I use plastic in this case for non glass lenses. Probably not full correct :-)
Could you have switched front and back side orientation of the lens?


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skycolt
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Apr 19, 2012 10:45 |  #10

ZoneV wrote in post #14292473 (external link)
Yeah, I use plastic in this case for non glass lenses. Probably not full correct :-)
Could you have switched front and back side orientation of the lens?

Pretty sure it's not the reason. The two sides are quite different.
Do anyone has idea is the element coated?

Thanks


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skycolt
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Apr 19, 2012 14:10 |  #11

update, I called them and was told that that part is not available for public. For at least 250, I am not sure if I should send in the lens. It's not a optically good lens anyway.
My lessen is to buy tamron from the authorized dealer or avoid it. After opened the lens and see the build quality, I'd rather avoid the brand from now on, although I was temped by their new 24-70 2.8 VC......


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ZoneV
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Apr 19, 2012 14:23 |  #12

I would say today are all lenses inside a consumer photographic lens are coated - except probably some "effect" lenses like Holga or such.

I suppose build quality will not much differ on most cheaper AF zoom lenses and cheap primes. This is one reason why I like old manual prime lenses - extreme good build quality.


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watt100
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Apr 19, 2012 15:56 |  #13

skycolt wrote in post #14293646 (external link)
update, I called them and was told that that part is not available for public. For at least 250, I am not sure if I should send in the lens. It's not a optically good lens anyway.
My lessen is to buy tamron from the authorized dealer or avoid it. After opened the lens and see the build quality, I'd rather avoid the brand from now on, although I was temped by their new 24-70 2.8 VC......

do some more tests, I've cleaned other Tamron lens (front and back) with alcohol with no problems, if it looks normal there may be something else going on




  
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skycolt
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Apr 19, 2012 16:19 |  #14

I'd love to. But I don't have experience about it. Can you recommend some links about it?

Thanks

watt100 wrote in post #14294281 (external link)
do some more tests, I've cleaned other Tamron lens (front and back) with alcohol with no problems, if it looks normal there may be something else going on


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joeblack2022
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Apr 19, 2012 16:29 |  #15

Did you take any photos BEFORE you cleaned the lens? I'm thinking the lens may have been like that to begin with...


Joel

  
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Help on tamron lens repair :(
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