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The possibility ofthe retrieval ofthe water's inherent optical properties (lOP) from Secchi disk observations is discussed. The paper directly addresses objections to the use ofSecchi disks raised by Preisendorfer in 1986. A new version of Secchi depth theory is given, which in contrast to conventional Secchi disk theories includes the effects of light reflection from the sea surface and treats measurements from both the sunny and shaded sides ofa vessel. Empirical correlations between different lOP are used to estimate not only the attenuation coefficient, but also the single scattering albedo and the backscattering probability at 550 nm from Secchi depth data. The theory is compared with measurements made in the Black Sea.

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