FULL FRAME VS APSC DEPTH OF FIELD (THE TRUH)

Started 2 months ago | Discussions thread
Bill Ferris
Bill Ferris Veteran Member • Posts: 6,446
Re: FULL FRAME VS APSC DEPTH OF FIELD (THE TRUH)
1

At 53mm, the Fuji would have captured a field of view (FOV) equivalent to that captured by an 80mm lens on the A7III. That's a 60% longer focal length than the 50mm you used with the Sony.

Here are two screen captures from your video:

Photo made with Sony A7III and 50mm lens

Photo made with Fuji X-Pro2 and 53mm lens (equivalent to 80mm FOV on a full-frame body)

The similarity in the FOVs of the two photos is not what I would have expected. Based on the opening statement in your video and a basic understanding of the relationship between focal length, sensor size, and the resulting FOV, one would expect the Fuji images to show a significantly narrower FOV.

The fact that the Fuji image so closely matches the FOV of the photo made with the Sony suggests you may have been farther from the subject (giving the resulting image greater DOF) with the Fuji to match the FOV of the A7III image or cropped the full-frame image (making its DOF more shallow) to roughly match the FOV of the X-Pro2 photo. There are other possible explanations.

Would you care to expand on the details of the test to explain the similarity in FOV between the above photos despite one being made with a 50mm focal length and the other made with effectively an 80mm focal length?

Thanks.

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Bill Ferris Photography
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