A Test of Equivalence

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AeroPhotographer Forum Member • Posts: 63
A Test of Equivalence

The equivalent field of view for various format sizes is without dispute. That is a 300mm lens on a 4/3 sensor has the same field of view as a 600mm lens on a full frame sensor.

But is that equivalence valid for reach? Will a 300mm lens on a 4/3 camera produce the equivalent quality (on a distant bird) as a 600mm lens on a full frame camera?

If any of you own both a full frame and a 4/3 or APS-C camera, and telephoto lenses for each, you could take some pics of a static target, with your cameras tripod mounted, and compare the results. A milk carton or soup can could be a simulated bird. Use a distance which makes the target about half the height of the frame, as you might compose a bird. And use the equivalent focal length for each camera. I recommend that you shoot a burst with each camera and select the sharpest shot.

How do the images compare? Is the image from the smaller camera equivalent?

Alan

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