This question already has an answer here:
I've come from 3x Zoom magnification land and am having a hard time adapting to all these complex "mm" systems. I'm thinking about buying some lenses to enhance the range of zoom of my Sony A5000 camera.
I am already aware of the fact that you get Max magnification (times zoom) from dividing the big number by the little number. (55-210mm = 3.8181818xzoom). I'm aware that in essence, this isn't magnification from an unzoomed (1x) perspective, but is instead, just how many x's from the "unzoomed" lens position that lens can increase it.
From this I can see:
- a 55-210mm lens has 3.8x zoom
- a 650-1300 lens has 2x zoom.
The trouble is, from looking at those lenses on Amazon, I can't help but convince myself that the 650-1300 lens, from its shape, is made for zooming in on objects a lot farther away. Therefore, on top of the "adjustable zoom" difference above, there must be a "base zoom x" which is how much the x zoom already is, when the lens is unzoomed.
How do you work that out, so that you know how far in a lens will go with your camera? I'm assuming of course, that there is a way, and people don't just buy lenses without any idea of how far in it will zoom.
Please try to avoid jargon; I don't really understand big terms, but there must be a simple way of working all this out.
I don't think this is a duplicate of that other question, because that one only showed what i explained above - the "adjustable zoom range". I need a way to work it all out, not just the zoom range of a camera.