Sigma 70-200mm f/2.8 II EX DG Macro HSM APO Front/Back Focus problem (AF microadjustment) Solved DIY.


After reading all possible and impossible articles and forum posts about Sigma 70-200mm f/2.8 II EX DG Macro HSM APO Front/Back Focus problem and not finding a solution i decided to solve the problem as i do usually - radically.

The idea is to create on the lens a hardware system, that hepls you to shift the focus manually exactly by the ammount needed to attain correct focus.

So i fixed on the focusing ring a metal stick which  touches an other metal "stopper" fixed on the body of the lens... then i performed AF on a target, afterwards switched to live view and manually adjusted the focus so it is correct. Now i fixed an other "stopper" metal part to the body which now stops the ring at the correct focus.

The metal stick as well as the "stoppers" are made of flexible steel plates, so if one needs to move the ring out of the "barriers", it can be easily done by pushing down one of the stoppers and sliding the stick above it.


Voila, the Sigma 70-200mm f/2.8 II EX DG Macro HSM APO works now. All you have to do is to push the stick against one stopper, perform AF, then shift the focusing ring to the second stopper and shoot... (I shoot twice, one on AF and one after shifting, because this Sigma sometimes frontfocuses, but sometimes focuses correctly)

And for those who would have some need to talk about how that lens looks like, be adviced, that i do not fucking care about how the lens looks like... i care how my pictures looks like...

Good luck

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