April 21, 2015
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On our Understanding Your DSLR Camera course we explain all of these things so it is good to find them in one place and available for all those poor people who don’t live in Oxford and so can’t attend our courses. This comes from Digital Camera World
Digital SLR cameras are the preferred tool of most professional photographers and they’re the first choice of camera for enthusiast photographers for decades, but what is a digital SLR, how do they work and why are they so popular? Our head of testing, Angela Nicholson explains all you need to know.
Digital SLR cameras explained: 1. Why Single Lens Reflex?
The name single lens reflex camera seems rather odd today, but there was a time when twin lens reflex (TLR) cameras were very popular – there are still one or two models on sale today.
The two lenses of an TLR have the same focal length and their focusing mechanisms are linked, but they are used for two different tasks.
The ‘viewing lens’ is used for focusing while the photographer looks in the waist-level viewfinder, while the ‘taking lens’ sits in front of the film, ready for exposure in a separate chamber.
The word ‘reflex’ in the name stems from the fact that TLR and SLR cameras have a reflex mirror, essentially a mirror at 45 degrees, that reflects light from the lens into the viewfinder.
In a TLR the mirror is fixed and the scene is visible in the viewfinder throughout the exposure.
In a digital SLR camera, however, the mirror flips up during exposure to allow the light to reach the film or sensor, this blanks out the viewfinder for the duration of the exposure.
See the rest here