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Understand the advantages of a digital SLR camera

Added on Tuesday 15th of March 2011 10:34 am EST



Operating Systems:


I’m new to photography and keep coming across the initials SLR in the digital photography literature I read. What do the letters stand for and how do they relate to digital photography?


The letters SLR stand for Single Lens Reflex, which is a term that applies to the viewing system of a camera. To understand how it relates to digital photography, we must first take a brief look at the early cameras.

Although these cameras came in all sorts of shapes and sizes, they all functioned in just about the same way. Most were essentially boxes that had a lens on one end and a piece of frosted, i.e. ground, glass on the other, as shown in Figure A. To view a subject, the photographer looked at the image projected on the ground glass.




The problem with this view camera was that the projected image was inverted and dim, especially under bright light. To see the image, the photographer had to shield the ground glass with a dark cloth placed over the camera and his head. The whole arrangement was less than ideal until the very early 1930s with the perfection of the DLR, the Duel Lens Reflex camera, as shown in Figure B.





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