- May 15, 2014
neuroanatomist said:kphoto99 said:chromophore said:Zoom ratios are exactly that: a lens like a 70-200mm has a zoom ratio of approximately 200/70 = 2.85714x at infinity focus, and the general formula is zoom ratio = (longest focal length)/(shortest focal length); therefore, a lens with only one focal length, say an 85mm prime, has a zoom ratio of 85/85 = 1x.
Technically that is correct, but what people want to know is how much closer something will appear when using this lens compared to a "standard" lens. For FF a "standard" lens would be 43mm (diagonal of the sensor size), so a 70-200 would be a 1.6-4.6x (IMHO).
ELPH 180, 8x zoom, FFeq FoV 28-224mm, 224 / 28 = 8
ELPH 190, 10x zoom, FFeq FoV 24-240mm, 240 / 24 = 10
ELPH 360, 12x zoom, FFeq FoV 25-300mm, 300 / 25 = 12
Do you see the pattern?
Sorry, but most P&S buyers today wouldn't know a comparison to what you call a 'standard' lens (43mm on FF) if it bit them on the ass. To most, a 'standard' lens is the ~30mm FFeq FoV they get with their smartphone camera.
I respectively disagree. When people ask "what kind of zoom do you have on that thing?" or they see a camera is a "10x zoom" or a "20x zoom" they are thinking "zoom in", aka, how telephoto a lens or camera is. So while they may not explicitly think about what is considered "normal" I can assure you they are thinking in terms of magnification. Think like a microscope.
They are not thinking that it is a zoom range/ratio as we know it to be. Nor do they understand that how much it "zooms in" or "magnifies" is dependent on that starting wide angle point. They see 10x zoom and think it gets them 10 times closer/bigger.