A Photographic Objective


MY attention was called some time since to a letter from Prof. Pickering in your issue of October 13, 1887 (vol. xxxvi. p. 562), describing a form of objective adaptable either to photographic or visual work, by reversion of crown lens and alteration of its distance from the flint.

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GRUBB, H. A Photographic Objective. Nature 37, 439 (1888). https://doi.org/10.1038/037439d0

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