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Source : https://www.techsyncweb.com/how-to-properly-care-for-your-helios-442-58mm-f2-a-comprehensive-guide/
Different versions of the lens, including the 44M and 44M-6, feature varying numbers of aperture blades, with older examples boasting as many as thirteen blades whilst later models were simplified down to as few as six, which subtly affects bokeh rendering.
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