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lens capabilities

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pocketshaver

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35mm
Many good zoom lenses came with a macro function in them. Some very good Sigma ones did as well with a very large price tag.

What I am curious on is, this,

Why is it that in SOME lenses in the 100-300 and 75-220 mm range,, the macro function doesn't create as much magnification in the viewfinder as the same lens, zoomed out to the same max length does when it has a diopter installed on it?
 
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