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The value of the lens is the ratio of the lens diameter to its focal length. The camera obscura’s lens value is 10ins/7ins = f15
5 Apr to 29 Jun, Sat 12-5, Sun 1-5; 1 Jul to 28 Sep Mon-Sat 12-5, Sun 1-5.
Also open Bank Holiday Mondays.
Last viewing 4.40.
Tel. 0844 493 2142
Historic Scotland / RCAHMS Merger
Avoiding unintended but serious consequences. … read more »