Confused about EF Lens FOV vs EFS when both are on APSC.

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Bionic963 Contributing Member • Posts: 529
Confused about EF Lens FOV vs EFS when both are on APSC.

I thought I understood that when you mount an EF lens to a 1.62 Apsc crop camera the sensor will not record the same FOV as if you would have had the same mm lens but in EF-S.

For instance.. If you had a EF 50mm 1.4 mounted to apsc and a EF-S 50mm 1.4 mounted to an apsc.

My theory is that the fov of the image recorded on the apsc sensor when using the ef lens will not match. The image recorded when using the EF 50mm lens on an apsc will have similar FOV to what an image recorded with an 81mm EF-S lens on an apsc would have (50mm x 1.62 = 81mm).

I thought this was based off the fact that the crop camera has smaller sensor, which results in a narrower field of view equivalent to what you'd get with a longer (1.6 times longer) focal length lens on a full frame camera.

Apparently my understanding of how this works is all wrong. If indeed my understanding is incorrect, then what does it mean when I see members post about liking to use apsc with there zoom lenses because they get "further reach"?? If the field of view is the same, then how do they get a more zoomed in image simply by putting an EF lens on a crop body?

I shoot with an APSC body. I have the EF-S 17-55mm, and the EF 50mm. Tommorw I plan on mounting the 50mm EF lens and take a photo, then I will mount my EF-s 17-55 and zoom to 50mm on the apsc and take a photo, them compare them..

Interested to finally get a good understanding of this.

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Brook

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