For the Sigma 70-300mm you will indeed require the 58mm filter. If using a kit lens , ie 18-55mm or the 55-200mm this will require a 52mm filter. Further more, filter sizes will depend on your future choice of lenses.
Hi! Usually the diameter is written on the front of the lens. You can use lens with different diameters on this camera, it really depends on the lens, but it will most likely be a 58mm.
Tom
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