by hjfok - 8/20/07 11:23 PM
In Reply to: Crop Factor by taboma
Thanks for your comments. I'm only an amateur, still have a lot to learn. I'm honored that you like my photos. You have very nice photos and special graphic effects. It is me who need to learn some tricks of Photoshop from you. Those photographers at photo.net are real pros, amazing photos.
Crop factor is also known as the focal length multiplier, conversion factor, etc. Many D-SLRs today have smaller sensors than the full frame pro D-SLR. The full frame D-SLR sensor size has the same dimension as the frame size of the 35mm films. One of the most popular size today is the APS-C, named after the popular APS cameras in the past. The smaller sensor will have a smaller field of view than the full frame sensor. Since you are interested in the Nikon D80, it has a crop factor of 1.5. This means that when you use a 50mm prime lens on the Nikon D80, the field of view is the same as using a 75mm prime lens on a 35mm film camera. Therefore, when one uses a camera with crop factor, the tele lens seems to have farther reach. But the problem of course is the loss of wide angle. That's why the kit lens now start at 18mm, because the field of view of the 18mm on the Nikon D80 will be equivalent to 27mm on the 35 mm film camera. So for a camera with a crop factor of 1.5, you multiple the focal length of the lens used by 1.5 to get the 35mm equivalent focal length's field of view.
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