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A digital single-lens reflex camera (also called a digital SLR or DSLR) is a digital camera that combines the optics and the mechanisms of a single-lens reflex camera with a digital imaging sensor, as opposed to photographic film.
Since DSLRs allow you to change the lens, hence you can use the macro lens which specifically are designed for macro photography. The magnified image which is going to be saved on the sensor after capturing, can be previewed using the optical viewfinders found on these digital cameras.