An upside-down image?
If you’ve ever looked through a telescope and wondered why the image is flipped upside down, don’t be alarmed, the telescope is not broken. Similar to a lens or mirror, some telescopes present an image that is upside-down, rotated, or inverted. As humans, our brains automatically reverse what our eyes see. You can attach an image erector accessory to flip the image but you’ll lose some of the object’s light. Besides, in space, there is no up or down, and with most objects, you won’t even know they’re upside-down.
Telescopes to choose from
When the time comes to choose which telescope you need, it’s important to know what your options are and what your aim is. If you’re looking to travel often and set up the telescope in under an hour, you’ll need a compact telescope. If the telescope has a more permanent spot in your home, and you have time for a diligent set-up, you can look at larger and more complex telescopes. Whether you’re aiming for the moon, comets, galaxies or nature-watching – the right telescope makes a world of difference. Over the years, three main types were designed: refractors, reflectors and compound telescopes; let’s take a look at each.
The refractors use a lens system to display the images and they use either Achromat or Apochromatic lenses to limit the effect of chromatic and spherical aberration. The Achromat lenses are designed with two pieces of glass that aren’t colour dependent, offering a more clear and accurate perception. Apochromatic lenses are comprised of up to four pieces of glass, producing superb image quality. It requires minimal maintenance, is simple to focus and the smaller versions are light enough to mount on a camera tripod, making it perfect to travel with.