Quote:Error of thinking is at you, BC. The equivalent is only DoF, not fast or slow correlating to shutter speed. When I use the 23/1.4 on Fuji and have 1/250, I also have 1/250 with 35/1.4 on FF.Not an error at all, it is an error of thinking that somehow you need to use the same ISO setting for each. That is the error of thinking.
Try instead of talk your theory. Anything else would not be logical, related to sensor sensitivity or refraction index of the used glass.
Aperture is a proportion, no absolute dimension.
Anyway, the Leica looks nice. I just stick with Touit 12/2.8
Do you have the opinion that somehow the sensor in a Nikon D750 or Canon 6D and a GX5 somehow have "the same sensitivity"?
Now for the simple maths:
24mm / 2 = 12mm.
Same FOV with equivalent focal lengths.
Aperture is a dimension, by the way.
12 / 1.4 = 8.57mm diameter aperture
24 / 2.8 = 8.57mm diameter aperture
Whadoyaknow, the same size the light travels through. Amazing. B)
Same DOF with equivalent F-stops.
ISO 100 on MFT, equivalent ISO setting on FF:
100 x 2 x 2 = ISO 400.
Using that equivalent ISO setting... Whadoyaknow, the same exposure time. How is that for speed.
By the way, stop saying it is "my" theory, though. It is generally accepted stuff, just optics and physics. :ph34r: