Also important is the build quality of your eyepiece and particularly its lens elements. Quite exotic glass is a prerequisite.

We trained the 21mm and 15mm eyepieces on the Pleiades star cluster and were rewarded with a sparkling, sharp view through both.

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Altair’s Ultraflat collection is designed to help correct field curvature, which causes stars to elongate towards the edge of the field of view. These eyepieces are presented in a satin green anodised finish with a bright stainless steel barrel and black rubber grip and eyecup.

Celestron are a renowned company when it comes to the manufacture of telescopes and astronomy accessories. This 8-24mm eyepiece enables you to select from a range of different magnifications by rotating the barrel while observing. This enables you to choose which is best suited for the celestial object in your field of view.

The Nagler’s most impressive attribute is its huge field of view. While other manufacturers keep their eyepieces within the human eye’s 50° field of view, Naglers go the extra mile to develop an ultra-wide 82° field.

For those used to using a Plössl eyepiece, the ultra-wide field of view offered by the Omegon Panorama II eyepieces will provide a whole new observing experience. You’ll be able to see detail across a much wider expanse of sky.

'Eye relief' refers to how far your eye must be from the eyepiece in order for you to see the entire field of view of an eyepiece.

Get your eye in the optimal position, 12.5mm from the lens surface, and you can gaze in all directions around the view. You can even look sideways into the eyepiece to take in the extreme edge of the field.

This tells you how far your eye must be from the eyepiece in order to see the entire field of view. A bigger distance (called longer eye relief) is useful if you wear glasses.

The view through the DeLite eyepiece series is excellent. The range includes eyepieces with focal lengths of 7mm, 11mm and 18.2mm.

As all eyepieces are a slightly different length depending on their power, it becomes quite easy to feel which is which in the dark when you want to change which one you're using.

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Some astronomers are glad they went through the years of wrestling with low-quality telescope eyepieces, as it gives them an appreciation of what it takes to see the night sky properly.

Plössls have a wide field of view (around 52°), so they can be used successfully for planetary as well as deep-sky viewing.

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The design incorporates 6 or 7 elements, all coated with special chemicals to increase the amount of light that travels through the eyepiece.

We got beautiful views of the Pleiades using the 24mm, while the 10mm and 15mm eyepiece provided tantalising glimpses of Mare Humboldtianum on the northeastern limb.

The field of view, at only 40° to 45°, may not be as great as a Plössl, but they are still good all-rounders. They come in particularly useful for making observations of the Moon and planets.

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The mount often comes with an eyepiece tray that sits between the tripod legs and holds the Barlow lens – always a useful feature when observing.

The take-home message from this is that the shorter the focal length of the eyepiece, the higher the magnification you will have.

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This is the size of the image that comes out of the eyepiece. Ideally it should be close to the size of your dark-adapted pupil – around 5mm to 7mm.

This 9mm eyepiece is medium-power but it offers an immense 120° apparent field of view. You might say this is an instrument that delivers an observing 'experience' than a simple view.

Having a range of eyepieces outside with you allows you to observe a greater number of different objects during an observing session.

It's a great option for practical astronomers who hate having to fumble in the dark for different eyepieces in order to swap magnifications.

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Likewise, we achieved beautiful views of the Moon, including intricate detail on the terminator. Crater Hevelius and crater Grimaldi were quite amazing.

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Two rubber grips help with handling, even when wearing gloves.Dust covers are included for both ends, as well as a microfibre cloth for cleaning.

Many telescope mounts have eyepiece receptacles built into them, but there are rarely enough holes for most observers’ collections.

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However, as telescope eyepieces commonly have 4 or more individual lens elements within them, non-reflective coatings are also vital, to cut down reflections between the lens surfaces that would otherwise reduce the contrast and spoil the view.

The high contrast delivered by the 18.2mm eyepiece was superb, but our favourite view was through the 7mm. These are fantastic eyepieces.

Observing the Andromeda Galaxy through a 4-inch refractor felt like observing through a low-power eyepiece on a much larger scope. Using this eyepiece is an amazing experience. Highly recommended.

Different celestial objects are best seen at different magnifications, which is why most observers have a range of different eyepieces.

Most decent telescopes for beginners have a 1.25-inch eyepiece barrel. When you get up to the really good, and expensive, stuff, though, it’s two-inch barrels all the way.

To say an eyepiece can make or break an astronomer is going too far, but when you look through a good eyepiece for the first time you realise that what you’ve been observing for all those years could have looked much clearer.

This is just another name for magnification. A telescope just captures the light – it is the eyepiece that magnifies the image.

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Many eyepieces that come with a small telescope like a refractor, or indeed reflector, are not best quality, but get the job done.

There's the option to physically adjust the distance of your eye from the eye lens, whether you're a spectacle-wearer or not. This means you can easily place your eye at the correct eye relief.

Omegon’s eyepiece collection consists of oculars with focal lengths of 5mm, 10mm, 15mm and 21mm, supplied in a box and finished in gloss black with two red stripes.

Your choice of eyepiece will determine the magnification and the size of the field of view that your telescope will deliver.

How do eyepieces work, what are the different types and which are the best eyepieces for your telescope? Find out in our beginners' guide.

The Radian is one of the newer types of eyepiece on the market. With a field of view comparable to a Plössl, you may wonder what the difference is. Well, one is the big eye relief, even with focal lengths down to 3mm.

This means that with one Barlow lens you have effectively doubled the number of eyepieces – and therefore magnifications – that you have at your disposal.

Another important attribute is the eyepiece’s apparent field of view (AFOV), which will normally be marked on the body along with its focal length.

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A Barlow lens is a marvellous bit of kit. It isn’t actually an eyepiece, but has optical elements that work with an eyepiece to increase the magnification.

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An eyepiece works by taking the light that’s captured and focussed by your telescope and magnifying the image that is seen by your eye.

This is sometimes abbreviated to FOV, and is the figure that lets you know how much of the sky you can see through your eyepiece. This measurement is given in degrees. Calculate an FOV before you buy with our field of view calculator.

Values range from 45˚ to over 100˚, but the eyepiece’s true field of view with a given telescope can be worked out with another simple calculation: apparent field of view divided by the magnification.

The Celestron Luminos is prized by Celestron as one of their latest releases: a new range of wide-angled eyepieces offering an 82 degree field of view. Each eyepiece in the Luminos range is multi-coated and designed to correct those chromatic aberrations that can often spoil our views of the night sky.

You can pay anything from around £30 up to £400 for a good eyepiece, and an item with the latter sort of price tag is something you’ll definitely want to look after.

The design suits medium and higher magnifications in order to get plenty of detail when looking at the planets. Internally, there are 6 or 7 lens elements that have very short focal lengths.

If the barrel measures just under an inch in diameter (and most eyepieces are described in imperial units) then it’s most likely been given away with one of the cheaper telescopes.

Eyepieces and telescopes are denoted by their focal lengths. Together, the two focal lengths produce a magnification, calculated as the telescope’s focal length divided by the eyepiece’s focal length (for more on this, read our guide to telescope stats).

Small refracting telescopes sold at a reasonable price are frequently packaged with a metal tripod, a basic altazimuth mount, a finderscope, a couple of eyepieces and a Barlow lens that will double their magnification.

A nice touch also is that you can start on the lowest - 24mm - to centre your target, then rotate to achieve the desired view.

However, a simple eyepiece sorter can be made using a plastic food container filled with ‘pick and pluck’ foam suitably crafted to house your eyepiece collection.

Orthoscopics are made with a four-element optical system that provides very good eye relief. The design also keeps down the amount of light that is refracted within the system very effectively.

We enjoyed some wonderful views of the Moon, including the Lunar X and Lunar V. We used the 5mm eyepiece to observe Montes Apenninus followed by Rupes Recta.

But it’s important to realise that good observing is not all about magnification. In fact, too high a magnification can spoil the view.

They also come with retractable eyecups - something of a must for telescope eyepieces these days - making them usable with or without spectacles.

A folding eyecup means the eyepiece can be used with or without spectacles, rounding this off as a nice eyepiece package suitable for lunar and planetary observing, as well as for deep-sky targets.

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Each eyepiece in the range has the same 62° field of view. Stars looked sharp through the DeLites and showed little or no false colour.

Sometimes, additional steps are also taken to increase contrast – such as ensuring that the inside of the eyepiece body is a very matt black.

It helps to start with a longer focal length eyepiece to locate your object and then use shorter focal lengths until you reach the optimum magnification for each object.

Some have multiple glass lenses inside that fit together to give you a beautifully crafted accessory that will last and last.

This is achieved by a very simple process: you slot the eyepiece into the Barlow lens and the whole contraption gets popped into where the eyepiece would normally go.