491cd051   
   From: boyd@apt0.sao.arizona.edu   
      
   Speedy wrote:   
   > So, do I qualify for posing questions in this forum?   
      
   Not really. This is an open forum and anyone can post anything.  Your   
   second post seems to me to be a different question from your first.  You   
   know the answer to your second question.   
      
   he problem with your first post is your use and failure to define the   
   meaning of  "apparent distance".   Neither a simple lens or a telescope   
   correctly modifies an image to a different "apparent distance" unless   
   all objects in the image are on the same image plane.  Otherwise the   
   perspective changes.     Focus distance is one of the least important   
   factors the  human eye and brain  use in determining "apparent distance".   
      
   Here's a puzzle:   
   What was the distance of the two cameras to the models use  to take   
   these two photos? We don't know the focal length or detector dimensions   
   of either camera.   What are your estimates in feet for each distance?   
   What clues or calculations did you use?   
   http://images.free-extras.com/pics/b/barbie_doll-513.jpg   
   http://4.bp.blogspot.com/_HijhRK2BkjA/S7nRdVTrjgI/AAAAAAAACRk/hc   
   LQBHngeY/s1600/business-suits.jpg   
      
   I don't know the correct answers.  I expect some here can estimate the   
   correct answers fairly accurately (within 20% error)  with an educated   
   guess or careful measurements and calculations.   I'm asking just as   
   food for thought about what "apparent distance" means.   
      
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