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Forum: Pentax SLR Lens Discussion
11-08-2017, 06:58 AM
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It will give you the same field of view as a 450mm on a 36mm x 24mm sensor ("full" frame). However, when prints are made, the image from the APS-C ("crop") sensor will have to be enlarged much more than the image from the full frame sensor to get the print to the same size as from the "full" frame, thus rendering the image fuzzier than the image from the "full" frame sensor. If you want a really long effective focal length, mount the telephoto on a Pentax Q. Of course, the resulting images will have to be greatly enlarged to view them at the same size as the prints from a "full" frame sensor.
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