Any negative effect of re-shimming?

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Janne Laiho

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Any negative effect of re-shimming?

PostSat Jul 06, 2013 5:44 pm

Hi,

I'm experiencing infinity focus issues on my BMCC with a Tokina 11-16 mm. I contacted BM support and they kindly offered to re-shim the camera. However, they point out that re-shimming the camera can "possibly affect" other lenses being used.

I'm wondering whether problems are likely with other lenses after a re-shim. Have people who've had their camera re-shimmed experienced problems with other lenses after the re-shim? I guess "problems" mean that some other lenses might not focus after a re-shim (are there other problems that might result from a re-shim?).

I really need a wide-angle lens that 1) doesn't have a fixed lens cap (so that I can use the lens with a matte box), 2) will accept filters, 3) is fast. The Tokina 11-16 would be a very good option, if I only could get it to focus to infinity. Is there a lens option that would satisfy the above, other than the Tokina?

Thanks, cheers,
Janne
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adamroberts

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Re: Any negative effect of re-shimming?

PostSat Jul 06, 2013 9:28 pm

I've not had mine re-shimmed but the process moves the mount closer to the sensor.

This would cause lenses that are correct (assuming the Tokina is incorrect) to focus past infinity and change their close focus point. The witness marks would also be out on those lenses but the lenses should work just fine other than that.

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