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people who only participated in passive activities such as playing games got little memory benefit. however, learning photography showed significant gains in memory. read more sigma updates sd and photo pro to support - f . dc hsm lens oct , at : sigma has released updates for its sd and sd merrill cameras...
well in most cases, an adjustable back focus makes it possible to improve image sharpness when using lower-cost zoom lenses, custom optics, or in unusual parameters. there should be an obvious need to refocus the lens before attempting to change the back focus. this is a very exacting task. some cameras...