Is the Panasonic 25mm a real f/1.4 lens?

Started Feb 17, 2014 | Discussions thread
Dr_Jon Veteran Member • Posts: 5,112
Re: Agree.

I would assume Canon just rounded the F-stop up, perhaps not to compete too closely with the 35/1.4 (it's probably a f1.8/1.9 really). That is really interesting though. Do note faster lenses will always loose more light going from F to T stops as the light hits the sensor at a bigger range of angles and less makes it down to the pixels (which are quite a way down).

I don't personally believe Robin Wong about the Olympus being faster. I also wonder if he was using a camera with a sensor which is particularly bad for high incidence angle light rays. That would then be bad with all fast lenses. I will be very interested to see the T-rating of the Panny f1.2 on a bunch of sensors.

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