Lens front/back focusing

[Digital_Clarity]

Do you know if back/front focusing can be 'fixed' using the micro adjustments of the lenses on the newer camera bodies such as the 50D and 7D?

I'm going to upgrade to a 7D and was thinking about getting the Sigma 30mm f1.4 but reviews say it is plagued with the risk of getting a 'bad copy'. Does this refer to front/back focusing also?

Thanks

 

[Flash In The Pan]

Do you know if back/front focusing can be 'fixed' using the micro adjustments of the lenses on the newer camera bodies such as the 50D and 7D?

I'm going to upgrade to a 7D and was thinking about getting the Sigma 30mm f1.4 but reviews say it is plagued with the risk of getting a 'bad copy'. Does this refer to front/back focusing also?

Thanks

99% of the "issues" with the 30mm f/1.4 are actually down to people not realising that the DoF at f/1.4 is razor-thin, rather than a fault with the lens itself....

 

[HoppyUK]

99% of the "issues" with the 30mm f/1.4 are actually down to people not realising that the DoF at f/1.4 is razor-thin, rather than a fault with the lens itself....

^^^ V true.

The other thing is people try to check the focus by using a sheet of A4 paper with a scale on it, downloaded from the web. This forces you to test the lens at an extremely close distance, where it will be right at at the limit of the manufactured tolerance, and with an artificially high degree of accuracy.

If you micro-adjust for that, you might well throw it out at normal range. If there is a problem with either de-centering (so called bad-copy syndrome) or focus calibration, Sigma should be able to sort it for you FOC.