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Let’s briefly revisit the five key points we identified when looking at compact cameras:

 RAW Shooting Always an option on DSLR.

 Lens range Interchangeable lenses mean a huge range of focal lengths is available. Crucially, SLRs (especially FX format) can give a wider view than any of the other classes.

 Sensor size See table above.

 Speed of response Varies, but even lesser SLRs are better than most compacts.

 Viewfinder An SLR would not be an SLR without a viewfinder, and it will nearly always be better than any compact. Most SLRs now have the option of Live View on the rear screen as well, which makes handling more awkward in most situations but can be handy when shooting at ground level, overhead, or on a tripod. Some SLRs have a fold-out rear screen, which can be an advantage for Live View or movie shooting but is basically a fragile nuisance the rest of the time.

SLR variants

The SLR is a brilliant design, but that doesn’t mean there’s no room for improvement. An obvious weakness is that big mirror at the heart of the camera. Every time this flips up it creates noise and vibration. And because the mirror needs room to flip up and down, there’s a large void in the middle of every SLR. This makes cameras bulkier than they would otherwise need to be, and pushes the lens further away from the sensor, which limits some of the options available to lens designers.