MSGID: 1:317/3 637bbce6   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
    EPOD - a service of USRA   
      
   The Earth Science Picture of the Day (EPOD) highlights the diverse processes   
   and phenomena which shape our planet and our lives. EPOD will collect and   
   archive photos, imagery, graphics, and artwork with short explanatory   
   captions and links exemplifying features within the Earth system. The   
   community is invited to contribute digital imagery, short captions and   
   relevant links.   
      
      
    Detailed Image of Dragonfly Eye   
      
      November 21, 2022   
      
      
       GregP_Dragonfly_eye   
      
      Photographer:  Greg Parker   
      
      Summary Author:  Greg Parker   
      
      Shown above is a full resolution, microscopic image of a dragonfly’s   
      eye. The huge  compound eyes of  dragonflies are composed of up   
      to 30,000 facets or little lenses. These compound eyes have a dorsal   
      (upper) region that detects light directly from the sky above, and a   
      ventral (under) region that collects light reflected off objects on the   
      ground.   
      
      We humans like to think our eyesight is pretty good, and thanks in   
      large part to our big brains, we have excellent vision. We rely only on   
      three  opsin genes, so we have three  photoreceptors (cones),   
      that are sensitive to blue, green, and red light. It turns out that the   
      diversity of opsin proteins that animals have in their eyes is related   
      to the quality of their vision.  Dragonflies have between 15 and 33   
      such opsin genes, which should give some indication of just how well   
      they can see.   
      
      Note that this image looks like it’s been taken with an electron   
      microscope as it has an enormous depth of focus. However, the   
       focus-stacking approach I use has a major advantage over electron   
      microscope images in that the image is reproduced in real color!   
      
      Photo details: Both focus-stacking and assembling a mosaic are required   
      to create an image such as this. I used a Canon 5D MkII DSLR and a   
      L300BHTG research trinocular microscope, operating at a magnification   
      of x20.   
      
      
      Hampshire, U.K Coordinates:  50.819444, -1.59   
      
      
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      Sicily  Black Widow Spider  Morning Dew and Spider Web   
      Illumination  Yellow-bellied Sapsucker in North Carolina   
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       More...   
      
   Animal Links   
      
        *  Animal Diversity Web   
        *  ARKive   
        *  BirdLife International   
        *  Bug Guide   
        *  Discover Life   
        *  Integrated Taxonomic Information System   
        *  Microbial Life Resources   
          Earth Science Picture of the Day is a service of the   
   -   
           Universities Space Research Association.   
      
   https://epod.usra.edu   
       
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