Ryan85 said:
zlatko said:
This is the guy who made a video to claim that Panasonic and Olympus "cheat you" by labeling their f/2.8 lenses as f/2.8 lenses.
I didn't see that but is he trying to say 2.8 lenses are a little different on that sensor size compared to what it's like on ff or crop sensors? My iPhone is a f2.2 but I'm not going to get bokeh with it since the sensor is so small. Do you think that's kinda what he's trying to say?
Yes, that's what he was trying to say. But to say that manufacturers "cheat you" about this is wrong in a number of ways. No, it's preposterous and quite unfair to the manufacturers. Aperture is not a measure of depth of field or bokeh. If you input f/2.8 or any aperture on a light meter or flash, it doesn't ask how big the sensor/film is or which lens or camera you're using, or how much depth of field you want. An exposure of, say, f/2.8, 1/250, ISO 400, is the same, regardless of the capture format. Manufacturers absolutely have to label their f/2.8 lenses as f/2.8 lenses (or use T-stops). To label an f/2.8 micro Four Thirds lens as "f/5.6" or "f/5.6 equivalent", because that's the effective depth of field in full-frame, would just be wrong. It's like stating distance based on how fast you want to go: a soccer field is 100 meters long if you're running, but "200 meters" long if you're walking. No, it's still 100 meters even if you're walking. So manufacturers don't cheat anyone with correct aperture labels. It's up to the photographer to know what depth/blur their lens & sensor will give — that's not the purpose of the aperture label on a lens.