Data reader apparatus having an adaptive lens

A data reader for reading an indicium, comprising:

• a case configured to be held in a hand of a user of the data reader, said case configured to house components of said data reader, said components comprising:
• a lens system for focusing illumination representing an image of said indicium, said lens system comprising a fluid lens;
• a fluid lens control module configured to apply a fluid lens control signal to said fluid lens to control an operational parameter thereof;
• an image sensor configured to receive said focused illumination representing said image of said indicium;
• an image sensor control module configured to operate said image sensor to capture data comprising at least a portion of a frame of image data from said focused illumination representing said image of said indicium;
• a processing module configured to process said at least a portion of said frame of image data to extract therefrom information of said indicium;
• and
• a temperature sensor for measuring a temperature of the fluid lens, wherein said fluid lens control module is configured to apply to said fluid lens a fluid lens control signal based on information output by said temperature sensor to effect operation of the fluid lens, without effecting a temperature change of the fluid lens, as the temperature of the fluid lens changes over time.