fine tunning DIY for Tamron 17-50mm F2.8


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nixontkl

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#1
The Tamron 17-50mm F2.8 is a popular lens, cos its F2.8 but it dont really cost you a limb. But there are saying that this lens, depending on your luck may suffer from some front or back focusing problem.

So here to share a simple DIY to fine tune your Tammy if you got the guts and interest to DIY

Tools u need will be a tweezers and a small Philips screwdriver (those mini type)

the front of the lens is covered by a plastic ring which you need to remove using a tweezers, there is a small hole on the ring, insert your tweezers into the hole and pry up. the ring is secure in by 3 short protruding pin.




the ring once removed and you can see on of the plastic holding pin.


with the front ring removed u will see 3 metal screws, these screw hold the front glass element and lock the focusing position of the front glass. remove the 3 screw and gently remove the ring, while removing use a soft cloth to press down on the glass, so that the glass is not lifted along with the ring. (the fitting is quite tight, u dont want to lift the ring and the glass together and while lifting the glass fall out, so press the glass down and remove only the ring)


with the ring removed, u can turn the glass clock wise or anti clock to adjust the focusing position of your lens. turn abit either way, replace the front holding ring and secure the 3 screw. make sure to aline the dot on the front holding ring with the focal range indicating line (so that your hood position is correct) Test for the focusing problem and repeat the steps to find the sweet spot.
 

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Daoyin

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Nov 25, 2008
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#2
Thanks for taking the trouble to outline the procedure. Don't think I will be trying this out any time soon without any calibration or alignment tools handy.
 

IamJeFfy

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Apr 15, 2002
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#3
i don't think turning the first element will help in the front/back focusing problem?
have you tried? care to share the results?
 

nixontkl

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#4
i don't think turning the first element will help in the front/back focusing problem?
have you tried? care to share the results?
Yes i had tried it on my lens, the front glass rise and drop when u turn the glass element.

I tested it by shooting abt 45deg at a ruler on my table and focus on a number, depending on the position of the front glass element the focus is either back or front. so u just need to find the position that give u center focus
 

mjselanx

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Aug 11, 2009
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#5
My tamron 17-50 had slight front focus, I tried your method, it worked. Took me just 1/2h to complete. To any would be experimenters you only need to turn the lens by very tinny amount. My local service shop wanted Eur 50.00 to do the job, thought I may as well tried it my self first.

Thanks very much for your tip.

Martin
 

plasma

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Nov 22, 2003
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#7
Is it possible to screw out the front element lense for cleaning?
Will this method work for other lens, like nikon or sigma?
 

soons

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Mar 22, 2007
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#8
Thanks for the cool tip... bookmarked. :)
 

nixontkl

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#9
every lens is unique, dont think my method will work across the other lens.

and yes u can remove the front glass to clean, but pls do be careful the front glass is abit heavy and careful not to drop it.
 

phazed1

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Jan 19, 2009
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#10
I took the plastic ring out and threw it away. Reason is that the filter holder ring is always loose!
 

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