Digital Single Lens Reflex, the digital version of the SLR with a mirror inside that flips up when you take a shot and can swap lenses on. They do take better photos but the trade off is they are bigger, heavier and more expensive. To get the equivalent range of a superzoom bridge camera like the ones listed would be very heavy. The quality of photos is not too far off a DSLR at suitable sensible zoom levels and you have the ability to capture a picture of something further out with lower quality if need be. It is all about the tradeoffs you wish to make as far as weight, bulk, price, resolution, ....
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