Amazing lens, incredible sharpness

cameron2 wrote:

Great Bustard wrote:

...it's either a 75mm f/1.8 or 150mm f/3.6 FF equivalent, but not a 150mm f/1.8 -- that would be a rather larger, heavier, and more expensive lens (think the Olympus 150 / 2).

Another way to think about it is that a 75mm f1.8 on m43 is the same as a 75mm f1.8 on a full frame camera, except that using the m43 sensor is like keeping only 26% of the pixels -- those in the center of the full frame sensor -- and throwing the other 74% of the pixels away. In other words, it has the same DOF, and the same light gathering, etc., and then you simply discard what amounts to an extremely large border.

This is, of course, the correctway to think about it

Check it out:

http://www.josephjamesphotography.com/equivalence/#superduperquick

• Consider two cameras, one with a sensor twice the size (four times the area) as the other. If we were to shoot the same scene with each camera from the same position, using the same lens, focal length, f-ratio, and shutter speed, crop the middle 25% of the photo from the camera with the larger sensor, then the resulting photo would be equivalent to the photo taken with the smaller sensor camera when displayed at the same size. If the sensors had the same efficiency and pixel density, then the crop from the larger sensor system would look exactly the same as the photo from the smaller sensor camera.

• Alternatively, if the sensors had the same efficiency and same number of pixels, but the larger sensor camera used a perfect 2x TC (teleconverter) with the same lens used on the smaller sensor camera, shot the same scene from the same position with the twice the f-ratio and four times the ISO (thus the same shutter speed), then the resulting photos from the two cameras would, once again, look exactly the same when displayed at the same size and brightness.