Archive 2023 · FX vs DX lens on a DX camera

DJT2020
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p.1 #1 · p.1 #1 · FX vs DX lens on a DX camera

Is there a difference in angle of view, with an FX lens vs. on a DX camera?

Feb 28, 2023 at 12:00 PM

RoamingScott
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p.1 #2 · p.1 #2 · FX vs DX lens on a DX camera

Your FX lens focal length and effective aperture are increased 50% when mounting to a DX body. Is that your question?

IE a 50/1.2 becomes effectively a 75/1.8.

Edited on Feb 28, 2023 at 12:03 PM · View previous versions

Feb 28, 2023 at 12:03 PM

AmbientMike
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p.1 #3 · p.1 #3 · FX vs DX lens on a DX camera

Yes. On Nikon the conversion factor is 1.5. So on aps an 18mm gives the same field as 27mm on ff.

Feb 28, 2023 at 12:03 PM

Ripolini
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p.1 #4 · p.1 #4 · FX vs DX lens on a DX camera

AmbientMike wrote:
Yes. On Nikon the conversion factor is 1.5. So on aps an 18mm gives the same field as 27mm on ff.

Correct. But focal length remains 18 mm. Focal length of a given lens never increases or reduces. The same holds for aperture. To compare the depth of field we get using a given lens (e.g., 50/1.4) on sensors with different size (APS-C or FF) we should decide if we take a picture at the same distance from the subject OR with same framing.

Feb 28, 2023 at 12:10 PM

runamuck
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p.1 #5 · p.1 #5 · FX vs DX lens on a DX camera

DX sensors use the center of the lens image circle. The center of the image is the sharpest part.

Feb 28, 2023 at 01:22 PM

DJT2020
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p.1 #6 · p.1 #6 · FX vs DX lens on a DX camera

What I meant was, if you put a 50mm FX lens on a DX camera, will it have a different field of view than a DX 50mm lens mounted on the same DX camera?

Mar 01, 2023 at 09:14 AM

Ross Martin
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p.1 #7 · p.1 #7 · FX vs DX lens on a DX camera

DJT2020 wrote:
What I meant was, if you put a 50mm FX lens on a DX camera, will it have a different field of view than a DX 50mm lens mounted on the same DX camera?

Not different. Same field of view.

Mar 01, 2023 at 09:22 AM

DJT2020
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p.1 #8 · p.1 #8 · FX vs DX lens on a DX camera

Ross Martin wrote:
Not different. Same field of view.
Thank you.

Mar 01, 2023 at 08:48 PM

Eric214
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p.1 #9 · p.1 #9 · FX vs DX lens on a DX camera

Ross Martin wrote:
Not different. Same field of view.

Incorrect. The length doesn't change. 18mm is still 18mm. BUT the FOV DOES change on a crop body or APS-C sensor to 27mm FOV equivalent to a 35mm (FX) sensor. You can not make an 18mm lens show 18mm FOV on an APS-C sensor

Mar 01, 2023 at 09:09 PM

Ross Martin
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p.1 #10 · p.1 #10 · FX vs DX lens on a DX camera

Eric214 wrote:
Incorrect. The length doesn't change. 18mm is still 18mm. BUT the FOV DOES change on a crop body or APS-C sensor to 27mm FOV equivalent to a 35mm (FX) sensor. You can not make an 18mm lens show 18mm FOV on an APS-C sensor

You are misunderstanding what the OP is asking. He clarified here, read it carefully:

“What I meant was, if you put a 50mm FX lens on a DX camera, will it have a different field of view than a DX 50mm lens mounted on the same DX camera?”

Mar 01, 2023 at 10:03 PM


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