These lens numbers indicate the distance at which your lens is currently focused. On some – but not all! – lenses, you will see a range of distances, usually marked in two scales, feet and meters. These variable maximum apertures are pretty common with kit lenses, and especially kit lenses with a large focal length range such as 28-300mm or 18-200mm. But if I zoom all the way to 35mm, my maximum aperture becomes f/4.) (At the lens’s widest, 17mm, I can open the aperture to f/2.8. What does this mean? It’s simple: the maximum aperture on the 85mm lens is f/1.8, and on the Tamron zoom, the maximum aperture changes from f/2.8 to f/4 as you zoom the lens. On the Tamron, you should see “1:2.8-4,” and on the 85mm, you should see “1:1.8.” In the photo below, you can see two different lenses: my Tamron 17-35mm and my Canon 85mm.
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