Can I see Jupiter with a 70mm telescope?
60mm (2.3in) to 70mm (2.8in) aperture or equivalent With telescopes of this aperture size, you’ll be able to see the moon and her craters, as well as some of the bigger planets. This is Jupiter with a 130mm aperture.
Which eyepiece is best for viewing the moon?
For a medium power eyepiece (approximately 150X) a 13mm or 14mm eyepiece would do. For a low power eyepiece (about 75X), which are great for finding and centering or observing very large and close objects like the Moon or Sun, an eyepiece between 25mm and 30mm would work well.
What is a Kellner eyepiece?
Kellner or “Achromat” Kellner eyepieces are a 3-lens design. They are inexpensive and have fairly good image from low to medium power and are far superior to Huygenian or Ramsden design. The eye relief is better than the Huygenian and worse than the Ramsden eyepieces.
Does focal length affect magnification?
The longer the focal length, the narrower the angle of view and the higher the magnification. The shorter the focal length, the wider the angle of view and the lower the magnification.
What does an eyepiece do on a telescope?
Basically, the eyepiece works a lot like a magnifying glass; it enables your eye to focus much more closely than you normally can. The eyepiece on a typical telescope allows you to inspect the image formed by the objective lens from a distance of an inch or less.
What does aperture mean in telescopes?
For an optical instrument, the aperture is the diameter of the objective lens (refracting telescope) or the primary mirror (reflecting telescope). The larger the aperture, the more light the telescope can gather, and the fainter the limiting magnitude of the instrument.
How does the eyepiece lens contribute to magnification?
In simple magnification, light from an object passes through a biconvex lens and is bent (refracted) towards your eye. Both of these contribute to the magnification of the object. The eyepiece lens usually magnifies 10x, and a typical objective lens magnifies 40x.