Originally posted by nsbca7:
Useing a 1.6 ratio body does in no way change the angle of light coming in through the lens. Normally vignetting would occur when useing a hood angled for a 80mm lens on a 50mm lens. But with the 1.6 ratio the parts of the sensor, the edges, that would have been effected by the loss of light are nonexistant. |
Yes, exactly. You could also make the case that if the light were cut off severely enough that the image circle were reduced to just outside the APS sensor outline, then stray light entering the camera body (the unused outer portion of the image circle) would be greatly reduced.
Originally posted by nsbca7:
But you must remember that the 1.6 ratio is only a crop factor and in reality does not change the way the given lens funtions. DOF with a 50mm lens will be the same on a camera with a full frame sensor as it will on a camera with a 1.6 ratio sensor. |
Let's not delve deeply into CoC and magnification, but suffice it to say that the apparent performance of the 50mm lens on the 1.6x crop camera will in all ways appear to the user to be like an 80mm lens, and that includes the DoF, for the same FINAL image magnification.
Originally posted by nsbca7:
That said I see little need for a lens hood for a 50mm lens. If you must have one for harsh lighting situations you can probably find one on ebay for a dollar or two to fit the filter threads on your lens. |
The 50/1.8 is not that flare resistant, and use of a lens hood is warranted and will help in many lighting situations, not just very harsh ones. Use of a hood is just good practice, from a lot of perspectives, including lens protection. That said, I don't feel that a longer hood would really provide much extra protection here, but neither would it hurt.
Message edited by author 2005-01-11 22:44:47.
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