Series 1X Process This seems to have been made in two versions and the first was not apochromatic, while
the second was apo and replaced it, perhaps over a period about 1930 when the first seems to have stopped
being listed. It is thought that both were dialyt type rather like the Aviar but slower and that these replaced an
early-20C symmetrical anastigmat and a triplet, but the details here are rather obscure as adverts for process
lenses were not too regular. Series 1X was not in a 1912 list.
Non-Apo Version. f8.0 9, 11, 13in; f10, 16, 18, 21, 25in; f16, 30, 36in.
Apo Version. f10, 13, 16, 18, 21, 25in; f16, 30, 36, 42, 48in.
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