Scope Telescope
How do I project a celestial image from my telescope onto a screen?
I want to show my children celestial images without them having to look through the eyepiece. I especially want to show them the sun and the moon projected onto a screen. Is there a special eyepiece for image projection onto a screen?
A follow-up question for projecting the sun would be: How do I make sure that the light does not harm the optics while still projecting it onto a screen? Do I need a solar filter? Also, how do you aim the telescope at the sun without look at it or looking through the spotter scope (I know that is definitely bad)? Do you use a solar filter on the spotter scope, too? I have a 5″ Celestron reflector telescope.
I’m not sure why you don’t want your children to look through the eyepiece, as that’s usually the best way to use a telescope.
There are two kinds of projection, optical and electronic. With optical projection, you just rack the eyepiece slightly outward, and it will act like the lens on a projector. This works for the Sun and Moon, because both are bright. In fact, eyepiece projection is one of the traditional ways of observing the Sun, since the projected image is dim enough to be safely viewed, though I worry about heat buildup inside the telescope and the heat in the beam as it emerges from the eyepiece. I prefer using a full aperture solar filter over the telescope’s objective and viewing with a normal eyepiece; the heat never gets inside the scope. Here’s one source of solar filters:
http://www.kendrickastro.com/astro/solarfilters.html
The other way is electronic: a webcam or something similar replaces the eyepiece, and allows viewing on a TV or computer screen. There are cameras specifically designed for use in telescopes, like this one:
http://www.telescope.com/jump.jsp?itemID=227711&itemType=PRODUCT&path=1%2C2%2C45&KickerID=844&KICKER
As for pointing the scope at the Sun, it’s really very easy: you use the shadow of the scope on the ground. You just adjust the scope until its shadow disappears, and then it will be pointed exactly at the Sun. It’s always best to keep the finder capped, as it can cause burns too.
Barska 300X Compact Travel Telescope-Spotting Scope
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