MFT Users: Do you miss the shallower depth-of-field of bigger sensor cameras?

Started Feb 8, 2014 | Discussions thread
Great Bustard Forum Pro • Posts: 40,847
Re: From past "conversations" with you...

LTZ470 wrote:

Great Bustard wrote:

LTZ470 wrote:

Same tripod, same day, same time...different cameras...EM1 100-300 vs A7r Sigma 70-300...and the FF DOF just killed the m43

A7r 70-300

EM1 100-300

EM1 100-300

...I know that you aren't really quite clear on simple concepts.

First of all, when people say that FF has a more shallow DOF than mFT, what they mean is that for a given perspective, framing, and display size, FF will have half the DOF for the same relative aperture (f-ratio) and the same DOF for the same virtual aperture (entrance pupil).

For example, if we took a photo of a bird at 300mm f/5.6 on FF (as in your first photo), we would not expect it to have the same DOF as a photo at 300mm f/5.6 on mFT, as either the perspective, framing, or both would be very different using 300mm on both systems.

Of course, your photos above are cropped, and that changes the DOF as well. For example, if you took a photo of a bird from the same position at 300mm f/5.6 on FF and 300mm f/5.6 on mFT, then cropped the FF photo to the same framing and displayed it at the same size as the mFT photo, they will both have the same DOF.

The tighter we frame, either by getting closer, using a longer focal length, or cropping, the more shallow the DOF will be.

On the other hand, maybe your "point" was merely to show that mFT can get the same DOF as FF by using a different perspective, framing, and/or cropping. Well, that's no more surprising than saying you can "turn a 300mm lens into a 600mm lens" by getting twice as close or framing wider and cropping. Shocker.

Maybe I should clarify for folks...SAME Tripod, SAME distance, SAME Bird, SAME day, SAME photog, SAME focal length...

As I said, the photos are cropped. Are they cropped in the same proportion? For example, if you shot the same bird from the "SAME Tripod, SAME distance, SAME Bird, SAME day, SAME photog, SAME focal length..." but you cropped the FF photo twice as much, well, I already discussed that above.

So, if you would be so kind, please post two fullsize files from any of the photos you posted (feel free to watermark the hell out of them if you are afraid of theft).

After that, we can discuss from there.

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