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osv2 Offline [X]
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for those who don't know, this is what decentering is: http://www.lensrentals.com/blog/2012/05/testing-for-a-decentered-lens-an-old-technique-gets-a-makeover
since the adapters in question don't have any glass elements, they can't be decentered, and they can't cause decentering in a lens... the light path through the glass remains unaltered, when the lens is mounted on an adapter.
however, there is a theoretical possibility of a very minor tilt effect, known as the scheimpflug principle: https://en.wikipedia.org/wiki/Scheimpflug_principle
it could in theory happen if one side of the adapter wasn't the exact same width as the other side, which is what people are attempting to measure... i've put micrometers on nearly a dozen cheap adapters, and i never found any adapter that was thicker on one side than the other side... i suspect that the mounting surfaces are cleaned up on a lathe?? so the only way that they could be off is if the adapter was mounted crooked on the lathe, which is imho a bit of a long shot.
i think that the overwhelming problem is with lenses, not adapters.
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Aug 08, 2015 at 03:21 PM |
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