A developer replenishing method of an automatic development device of photosensitive lithographic printing plate including developing a plurality of exposed photosensitive lithographic printing plates with a developer containing an electrolyte and keeping the developer activity constant by replenishing with a replenisher. The method includes obtaining certain defined values, conducting defined calculations, comparing defined values and, dependent on the comparison, setting new values An automatic development device which carries out the method is also set forth.

 
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< Digital camera system, camera body of digital camera, and interchangeable lens

> Lens barrel and picture taking apparatus having the same

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