just got 7d, I am really frustrated right now.

Started Aug 27, 2012 | Discussions thread
jitteringjr Veteran Member • Posts: 3,608
Re: Probably operator error

mforbes wrote:

So he got two misaligned lenses and a perfect 7D body, we will see how that goes. Anyone venture to bet that the same two lenses on his friend's Ti produce perfectly focused results? Anybody?

Your line of thinking is restricted to absolutes here and is insufficient logic for complex equipment. The reality is that in manufacturing we have tolerances. If the two 7Ds the OP had both were at the negative end of the tolerance band and the Sigma and Tokina lenses he has are at the positive end of the band, the combined system will produce out of focus images even though nothing is technically misaligned or ‘bad’.

The friends Rebel and kit lenses could also be at the negative end of the band. A future 17-55 and 10-22 could come in and be at the positive end of the band and produce soft images as well.

In a perfect world, the manufacturing tolerances would be zero and the additional cost of manufacturing equipment to these much higher standards would be zero, but we don’t live in that world.

 jitteringjr's gear list:jitteringjr's gear list
Canon EOS 7D Canon EF 50mm f/1.4 USM Canon EF 50mm f/1.8 II Canon EF 85mm f/1.8 USM Canon EF 135mm F2L USM +7 more
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