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Message: <blockquote data-quote="Geoffc" data-source="post: 200006" data-attributes="member: 8705">I've just realised that I probably owe some of you an apology. Having read a few of the recent posts it's now obvious that some members do not actually understand the basic difference between FX and DX with regards to the mysterious crop factor. This became apparent with the references to my use of the same lens providing different focal lengths on the two formats and a 1.5 crop factors not being considered. In fact it's been suggested that the DX body had the edge because it magnified the image!!Unfortunately I based my tests on both bodies conforming to the laws of physics which would make 50mm be the focal length and magnification whichever body I attached it to. Admittedly the smaller DX sensor would throw away data around the edge (see Jake's version of the images) but at least the projected "subject" would be the same size when it hit the back of the camera (sensor).I guess I should have ignored the principle that physics applies equally in FX and DX and factored in some magic that made my 50mm lens pretend it was 75mm long on a DX. Sadly like most things in life, when you claim something is longer than it actually is you eventually get found out which can cause embarrassment.Again my sincere apologies for not appreciating the mixed ability  audience and leaping in with something that was photography fact rather than marketing magic.Unless someone is going to provide a demonstration that disputes my example (that should be interesting) I will consider this done to death, finished and ended. We have different views and I don't think this will change them.</blockquote>

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