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Microcam zoom

Itr

n3wb
any microcam suggestions and if affordable mcrocam does not have zoom,in order to be able to read an inch high letters 4-5meters away,would high res (which)and photoshop sharpening help.what about focus length?
 

Itr

n3wb
Ok but is there a formula or thumb rule fot obbject size s at distance d one needs zoom z, and or lens with focus f etc?
 
Ok but is there a formula or thumb rule fot obbject size s at distance d one needs zoom z, and or lens with focus f etc?
I've seen formula's for kind of thing, I think on this site! Do some searches on here and that should show up.
 
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