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To recreate a projection of the transit of Venus

  1. Jun 29, 2012 #1
    Hi! Newly registered here, with an optics question.

    I was going through some photos I took of the transit of Venus this year, where I'd used a reflecting telescope to project the image of the sun and the passing planet onto a piece of white paper. Image: http://imgur.com/3mdUN

    I showed it to some friends and one responded words to the effect, "I know I should be amazed, but I can't help thinking I could recreate that with a flashlight and a sharpie." I understand the sun is much brighter than any flashlight: my question really relates to the focus of the image produced.

    My counter to this point was that for the sun/Venus system, one could reach an arbitrary level of resolution, whereas with a flashlight, the light source and sharpie blackout would be so close that the "planet" could never achieve the same level of focus..? I admit, I don't really know what I'm talking about, so I'd really appreciate anyone's advice/expertise.

    Thanks in advance.
  2. jcsd
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