For such objects, a focal ratio of
f/10 or more
is ideal. But if you want to see wide views of star clusters, galaxies, and the Milky Way, a lower focal ratio is better. You get less magnification, but you see more of the sky. Wide field telescopes have a focal ratio of f/7 or less.
What telescope focal length is best for astrophotography?
Common advice for beginners in astrophotography is to start with shorter focal length telescopes (
600-800mm or even below
, which give you a wider field of view) and a focal ratio of f/6 or lower (which helps you minimize exposure time).
Is focal length important in telescopes?
The focal length is also important.
The FOCAL LENGTH is effectively the length of the telescope
. … A longer focal length will produce a larger image and a shorter focal length will produce a smaller image. The eyepiece is then used, much like a microscope, to magnify that image.
Which is better 60mm or 70mm telescope?
However, a
70 mm refractor
(which collects 36% more light than a 60mm telescope) is considered by many amateur astronomers to be the minimum size for a good quality beginner refractor telescope. It is acceptable for observing bright objects like lunar details, planets, star clusters, and bright double stars.
What size lens is best for telescope?
18 mm – 24.9 mm
Eyepieces
Works nicely on long focal length telescopes to show wide field and extended objects. Shorter focal length telescopes will enjoy great mid-range magnification of galaxy clusters and large open clusters.
How much magnification do you need to see Jupiter?
To look at planets like Jupiter and Saturn, you will need a magnification of
about 180
; with that you should be able to see the planets and their moons. If you want to look at the planet alone with higher resolution, you will need a magnification of about 380.
How do you increase the focal length of a telescope?
When used in a telescope,
a Barlow lens
increases the telescope’s focal length, thus, magnifying the image. Barlow lenses are usually placed before the eyepiece, and they may double or triple the magnification of a telescope.
What focal length is best for deep space astrophotography?
Long focal-length, deep-sky astrophotography (
starting around 2,000 mm
) is best done from outer space, or when you’re well along the challenging learning curve. There are many compact, long-focal-length telescopes on the market for visual observers (think Schmidt-Cassegrains and Maksutov-Cassegrains).
What is the most powerful telescope for home use?
- Celestron CGX-L Equatorial 1400 Telescope Bundle.
- Celestron CGX-L Equatorial 1400 EdgeHD Telescope Bundle.
- Meade LX200 14-inch Telescope Bundle.
- Celestron 14-inch OTA.
- Celestron 14-inch EdgeHD OTA.
- Meade LX850 16-inch f/8 OTA.
Why are refractors better for astrophotography?
Refractors are compact and lightweight compared to other telescope designs. The focusers are solid and easy to focus. They offer a similar experience to a high-end telephoto camera lens. The
image quality potential for astrophotography is exceptional
.
What size telescope do I need to see the rings of Saturn?
The rings of Saturn should be visible in even the
smallest telescope at 25x [magnified by 25 times]
. A good 3-inch scope at 50x [magnified by 50 times] can show them as a separate structure detached on all sides from the ball of the planet. Want to see Saturn’s rings?
Do I need an expensive telescope to enjoy astronomy?
Astronomers observe the objects in the night sky to try to determine their composition and learn more about the origin and structure of the universe. Do I need an expensive telescope to enjoy astronomy? …
The only thing you really need to enjoy the night sky is your eyes, a dark viewing location, and some patience
.
Can you see Saturns rings with a 70mm telescope?
The colorful bands and belts of Jupiter, as well as its four major moons, and
the rings of Saturn are clearly visible in a 70mm telescope
. … So it naturally follows that a larger telescope will do even better. Uranus and Neptune are also reachable with small telescopes.
What eyepiece is best for galaxies?
10mm – 13.9mm Eyepieces
: These work well for all objects including brighter nebula and galaxies a good mid/high range magnification. 14mm – 17.9mm Eyepieces: These are a great mid range magnification and will help resolve globular clusters, galaxy details and planetary nebulae.
What eyepiece is best for 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.
How can I make my telescope stronger?
- Cardboard telescoping mailing tube with a diameter of 50 mm and a length of 1,100 mm.
- Concave-convex lens (the objective lens) with a diameter of 49 mm and a focal length of 1,350 mm.
- Plano-concave lens (the eyepiece) with a diameter of 49 mm and a focal length of 152 mm.
- Coping saw.
- Box cutter.
