The largest-focal-length eyepiece you can use with your telescope is easy to calculate: multiply the focal ratio (the focal length of your scope divided by its aperture) by 7. For example, your Newtonian scope is f/5: the largest-focal-length eyepiece you should use is 35 mm.
Which eyepiece is best for viewing planets?
The focal length of the telescope is 900mm, so to achieve the maximum useful magnification, then a 4.5mm eyepiece would be ideal. One of the best parts about planetary viewing or imaging is that since the objects are so bright, you can do it just about anywhere regardless of light pollution.
What is a good size eyepiece to use in a telescope?
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.
Is 10mm or 25mm better for telescope?
10mm gives you a middle-range magnification for going into more detail. For example, in a telescope with a 750mm focal length, 75X magnification. Or in a telescope with a 1000mm focal length, 100X magnification. So you’ve visited the Moon using the 25mm eyepiece, and seen the alternating dark and light areas.
Which eyepiece is best for viewing stars?
Plössl eyepieces are excellent for general use although their eye relief will diminish as the eyepiece’s focal length reduces. This design is most suitable for observing nebulae and star clusters. A 15mm and 25mm Plössl eyepiece would be good additions to your current line-up.
What can you see with a 100mm telescope?
What Can You Expect From 100mm Telescopes? (With Photos)
- The maximum magnitude of a 100mm telescope is 13.6. For reference, the Moon has a magnitude of -12.74 and Mars has a magnitude of -2.6.
- The Moon. The Moon looks amazing in these telescopes.
- Mars.
- Venus.
- Jupiter.
- Saturn and Neptune.
- Pluto and Dwarf Planets.
- Mercury.
How many telescope eyepieces do I need?
Typically, a collection of four – 6mm, 10mm, 15mm and 25mm – will cover most observing requirements. A good selection of eyepieces will serve you well and give you options depending on what you want to observe.
What does Plossl mean?
The Plössl is an eyepiece usually consisting of two sets of doublets, designed by Georg Simon Plössl in 1860. Since the two doublets can be identical this design is sometimes called a symmetrical eyepiece. The compound Plössl lens provides a large 50° or more apparent field of view, along with relatively large FOV.
Which eyepiece is best for viewing planets Celestron?
Best eyepiece for viewing Jupiter
| Telescope | Aperture | Eyepiece size |
|---|---|---|
| Orion Observer | 70mm | 10mm |
| Celestron Astromaster 114EQ | 114mm | 10mm |
| Celestron Nexstar 6SE | 152mm | 10mm |
| Celestron 11″ Schmidt-Cassegrain | 279mm | 8mm |
What can you see with a 25mm eyepiece?
25mm – 30.9mm Telescope Eyepieces: These are extended field eyepieces for longer focal length – good for large nebula and open clusters. For shorter focal length, they are fantastic for large objects such as the Orion nebula, views of the full lunar disc, large open clusters and more.
What focal length eyepiece do you need?
Get one with as large an AFOV as you can afford. Even a magnification of 300x is a stretch on many nights, so a 5mm eyepiece that gives 240x would work as well. For the lowest-power eyepiece, to get an exit pupil of about 5mm, we need an eyepiece with a focal length of about 24mm. That gives a magnification of 50x.
Are telescope eyepieces universal?
Eyepieces are mostly universal, but come in three basic sizes: most common is 1.25″ diameter (the ETX-70 uses this), but some older telescopes use 0.965″ eyepieces and some high-end scopes use 2″ eyepieces.
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 can you see with a 4mm eyepiece?
The Apertura 4mm Plossl eyepiece produces sharp, high magnification views of the Moon and planets, and, depending on the telescope, will also work great for double stars, planetary nebulae, and other deep sky objects. Like most Plossl eyepieces, the High Point 4mm has a 52º apparent field of view.
How good are zoom telescope eyepieces?
They tend to occupy the middle ground of focal length/magnification, so you may still need a very high and low magnification eyepieces (short and long focal length, respectively), but a zoom could handle everything in between for you. On the face of it, they are a fantastic tool, but nothing is perfect.
Are Celestron eyepieces good?
Celestron X-Cel LX Series Eyepiece is another excellent product from Celestron. It works well for all 1.25-inches telescope, and it is adapted to accept colored and moon filters. This telescope eyepiece is affordable and comes in a protective box that makes it durable.
What can I see with a 700mm telescope?
With a 70mm telescope, you will easily be able to see every planet in the Solar System. You will also be able to take a great look at the Moon and clearly distinguish most of its recognizable features and craters. Mars will look great.
What can you see with a 90x telescope?
Thus a 90x magification on a very large (wide) telescope would let you see a very large number of things (if you are in an area where the sky is dark), but 90x on a small telescope would let you see a number of interesting things (the Moon, planets, some nebulae and star clusters) but not relatively faint objects.
What can you see with a 12 inch Dobsonian telescope?
12-inch Telescopes offer exceptional resolution for their size. They can resolve double stars at . 38 arcseconds and can be magnified up to 610 times the human eye. 12″ Optical tubes also make exceptional light gatherers by allowing an observer to see 16.2 magnitude stars!
What magnification 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.
What is the difference between 1.25 and 2 eyepieces?
A 2″ eyepiece will have a larger field stop than a 1.25″ giving you a wider field of view. Typically this would be for eyepieces 30 – 40mm focal length. Usually you only need one eyepiece in this range for your lowest power views.
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