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Amazing lens, incredible sharpness

Started Aug 20, 2013 | User reviews thread
Klarno
Klarno Veteran Member • Posts: 4,239
Re: Well, what do you mean by 1.8?
1

David Kieltyka wrote:

Just to note...the lens doesn't give a rat's dupa what the characteristics are of the sensor or film frame it's mounted in front of. If the ratio of focal length to max. aperture diaphragm size is 1.8:1 then the lens is a 1.8. Period (allowing for manufacturing tolerances and lens maker rounding/exaggerating).

With that reasoning in place, then you also certainly cannot say that it is a 150mm lens, as the OP caimed. The lens, not giving a rat's dupa about the characteristics of the imaging field, was engineered to have a 75mm focal length, and that's the focal length that it has, end of story, full stop, allowing for manufacturing tolerances and rounding/exaggerating.

However, one needs both a lens and an imaging field to capture an image. That's why we try to compare, because the properties of the imaging field vary between systems.

If you wanted to say what lens you would need on 35mm format to achieve an image with the same characteristics as a 75mm f/1.8 on MFT, then you would say it is equivalent to a 150mm f/3.6, not a 150mm f/1.8. Nobody, however, should be saying that the two are one and the same. If you mounted a 150mm f/3.6 on a MFT camera expecting it to work like a 75mm f/1.8 on MFT, you'll be sorely disappointed.

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Sony Alpha NEX-6 Olympus E-M1 Olympus M.Zuiko Digital ED 40-150mm F4-5.6 R Olympus 12-40mm F2.8 Pro +9 more
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