I seeand thank you. All i can lay my hand on is an 24-105 lens and 105mm is the best focal length. I see the telescopes usually use at least 500mm focal length. When doing telescopy does it require the light from the star to be parallel? Does the indoor telescope demo require dark ambient environment?
Hi, I am trying to understand the mechanism of spectroscopy used in astronomy, and the feasibility to use it to measure the spectrums of light bulbs, flames and lamps. With a black board with a needle hole, placed behind the light source to emulate a star, then use the SA-100, 105mm lens and a DSLR combo to photograph the needle hole, will it yield the same effect as spectroscopy seen in this forum? SC