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Message: <blockquote data-quote="Edwin" data-source="post: 1545421" data-attributes="member: 124289">The reason Holga specifies ISO 100 or 400 is probably because its DX code reader only recognizes those two ISOs. So if you use ISO 200 film the camera may default to ISO 100 and all your pictures will be underexposed by 1 stop. If, instead, it defaulted to ISO 400 all your pictures would be overexposed by 1 stop. Just use the ISO Holga specifies.ASA and ISO pretty much mean the same thing: A measurement of the sensitivity to light of a light sensitive surface. ISO replaced ASA as a means of expressing film speed.</blockquote>