Introduced into competition shooting at Bisley before the war, this is a type of magnified sight which uses independent lenses mounted to the front and rear of a rifle (some fitted to the SMLE rear sight and some attached to the back of the receiver). This was low profile, relatively inexpensive, and quick to put into service, but the sights themselves were severely handicapped compared to modern telescopes. They offered about 2.5x magnification and a very large depth of field, but at the cost of a very narrow field of view and small eyebox. They were also easily dirtied, and the front aiming point was often difficult to discern against the background image.
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