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Focal reducers convert both the focal length and aperture of the lens. You can think of it as multiplying by 1 = 0.7/0.7. Your 50/2 lens will behave like a 35/1.4 (= 50×0.7 / 2×0.7) lens when used with the focal reducer. Although DOF and background blur tend to be inversely related (minimizing DOF will maximize background blur), they are different concepts. ...


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The combined lens (50mm f/2 and a 0.71x speedbooster/telecompressor) will act like a 35mm/f1.4 lens in all regards (Same applies to teleconverters, in the other direction. lens designs exist that consist of a teleconverter or telecompressor behind a main lens, eg many 100mm macro lenses are 50mm macro lenses with a teleconverter in the back...). DOF will be ...


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We measure the potential “speed” of a camera lens using the f-number system. The f-number is derived by dividing the focal length of the lens by the working diameter of the lens aperture (iris). As an example, a 50mm focal length lens with its aperture set to 25mm is operating at f/2. If we wish this lens was faster, we can mount a “speed buster”. What ...


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