124. Dallmeyer Triple Achromatic Lens, 1861
Signed: 'TRIPLE ACHROMATIC LENS. J. H. Dallmeyer. LONDON N1 6679' and 'A.D. 1861'.
Early triplet lens consisting of three achromatic lenses: a smaller central component near the stop, and larger front and rear components. This f10 lens of 250 focal length has a slit between the lenses for Waterhouse stops. This lens type did not survive the 1860s but was superseded by the rapid rectilinear lens.
Length 65 mm, diameter 44 mm.
Inventory no. 76,121