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.