Whats the easiest way to convert 35mm to a DX crop?
Posted by admin | Under Nikon D90 DX Monday Oct 12, 2009Hello, i have a nikon d90 and my dad gave me some of his old 70’s lenses for 35mm film cameras or full frame. (I also use the 18-55mm). so i was wondering, to figure out what the 35mm lenses were equal to on my DX format sensor (or cannon 1.6x), do i just multiply the focal length by 1.5 to see what it’s equal to on my dx camera? or what is the proper mathematical formula to it out? thanks a bunch.
Your Nikon has a 1.5 "crop factor" due to the DX sensor. So to determine the equivalent 35mm focal length just multiply the focal length of the lens your dad gave you by 1.5.
The "crop factor" does not change the actual focal length on the lens. It changes the angle of view. So a 16mm lens used on a 35mm film camera might have an angle of view of 180 degrees but on your DX sensor D90 its angle of view would be equivalent to a 24mm lens.
At http://www.digital-photography-school.com/crop-factor-explained# you’ll find a good explanation with illustrations. The site is also a good source of information about photography in general.
your 18-55mm is 18-55mm
and a 50mm for a film camera will be 50mm
but the digital sensor crops it,
so your 18-55mm would be the equivalent of 28-83mm
and a 50mm would be the equivalent of 75mm
aperture wouldn’t change because you’re not actually changing the focal length, you’re just not using the entire image circle.
References :
Your Nikon has a 1.5 "crop factor" due to the DX sensor. So to determine the equivalent 35mm focal length just multiply the focal length of the lens your dad gave you by 1.5.
The "crop factor" does not change the actual focal length on the lens. It changes the angle of view. So a 16mm lens used on a 35mm film camera might have an angle of view of 180 degrees but on your DX sensor D90 its angle of view would be equivalent to a 24mm lens.
At http://www.digital-photography-school.com/crop-factor-explained# you’ll find a good explanation with illustrations. The site is also a good source of information about photography in general.
References :