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DX Lenses and Crop Factor


Rancho Cordova, US
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"RE: DX Lenses and Crop Factor"

avm247 Moderator Awarded for high skills in documentary architecture and aviation photography Donor Ribbon. Awarded for his support to the Fundraising Campaign 2014 Charter Member
Tue 12-Mar-13 06:28 PM

I think in terms of a 35mm film camera (135 format) with a negative of 36mm x 24mm. When I think of lenses and focal lengths, I think in terms of what that lens will give me as an angle of view with respect to a 35mm film or FX digital camera:
24mm = 84 degrees
35mm = 62 degrees
50mm = 46°

In DX format:
24mm = 61°
35mm = 44°
50mm = 31°30'

But I'm not comfortable learning the angle of view for DX focal lengths, so I translate to FX angle of views with the 1.5x crop.

In FX, a normal lens is the 50mm lens with 46° angle of view in DX, a 35mm x 1.5 = 52.5mm whic is pretty close to 50mm and has an angle of view of 44° ... making it a "normal lens" for DX bodies.

Long story longer, yes, do the crop factor thing if you think in terms of film/FX lenses and are comfortable with it.

I hope that makes sense.


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A general, generic topic DX Lenses and Crop Factor [View all] , dperry23 , Tue 12-Mar-13 11:33 AM
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