Is 80 mm refractor telescope good?

The 80mm objective lens and short 400mm (f/5.0) focal length are perfect for taking in wide swaths of the heavens, making it ideal for larger deep-sky objects. You’ll see spectacular star clusters, wispy nebulas, and expansive galaxies with this telescope, but it also excels at viewing objects in our solar system.

What is the focal length of a refractor telescope?

The main specifications for a really useful first telescope should be: a minimum aperture of at least 90mm for a refractor or 130mm for a reflector and 1,000mm focal length for each. This combination will provide enough light grasp and permit a high enough magnification to see detail on the brighter planets.

Do refractors have long focal length?

Another method of reducing chromatic aberration in refractors is that one designs refractors with the smallest possible aperture ratio. This means that these telescopes must have long focal lengths. This has the effect of also reducing chromatic aberration.

What is 80mm telescope?

LARGE 80MM OBJECTIVE LENS: Our refractor telescope is equipped with a large 80mm aperture objective lens that provides enhanced, brighter views compared to the 70mm model while adding very little additional weight. Setting up and using the Travel Scope is quick and easy.

What focal ratio is good for planets?

Focal Ratio – Faster, Brighter, Smaller A long focal ratio implies higher magnification and narrower field of view with a given eyepiece, which is great for observing the moon and planets and double stars. For such objects, a focal ratio of f/10 or more is ideal.

Is longer focal length better?

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 is a good focal ratio for a telescope?

Is 70mm or 80mm telescope better?

But it’s enough, that things that are difficult in a 70mm are considerably easier in an 80mm. And size wise, the 70mm is smaller but not a lot smaller and I use them on the same mounts so the difference in portability is essentially zero. If one has a good 80mm ed/apo, a good 70mm doesn’t make much sense.