FujiFilm X-T1 - Manual (Page 66)

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Sensitivity Sensitivity
“Sensitivity” refers to the camera’s sensitivity to light. Sensitivity is ad-
justed by pressing the dial lock release and rotating the sensitivity dial;
choose from values between 200 and 6400, or select L (100), H1 (defaults
to 12800), or H2 (defaults to 25600) for special situations. Higher values
can be used to reduce blur when lighting is poor, while lower values al-
low slower shutter speeds or wider apertures in bright light; note, how-
ever, that mottling may appear in pictures taken at high sensitivities, particularly at H2, while choosing
L reduces dynamic range. Values of from ISO 200 to ISO 6400 are recommended in most situations. If
A (auto) is selected, the camera will adjust sensitivity automatically in response to shooting conditions.
R RAW images can not be recorded at settings of L, H1, or H2. Only JPEG images will be recorded if these settings
are chosen when RAW, FINE+RAW, or NORMAL+RAW is selected for image quality ( P 79).
R The N ISO DIAL SETTING option in the setup menu can be used to choose the sensitivity assigned to the H1
and H2 positions on the sensitivity dial ( P 91). Choose from 12800, 25600, and 51200.