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Telescope eyepieces are the most important accessory for any visual telescope setup because they determine the magnifying power at which you're viewing. Change the eyepiece and you can bring an object closer or widen the field of view to observe a larger area of sky. Telescope eyepieces are available in a wide variety of designs, sizes, and prices, and OPT is more than happy to help you find which kind of eyepiece is best suited to your individual needs and preferences.
Plossl & Standard Eyepieces:
Crafted by Georg S. Plossl in the 1890s, the Plossl eyepiece design consists of two sets of doublets, in a 4-element design, which provide an approximate 50 degree field of view. Although it has a relatively short eye relief, the Plossl eyepiece delivers quality views of deep space and planetary subjects at all focal ratios. It remains one of the most highly regarded of all telescope eyepiece styles, and it's considered an excellent performer for all-around use.
'Electronic Eyepiece' is in fact a term referring to eyepieces that are either cameras, or electronically aided. There are also cameras that are suitable for use as eyepieces, which are great for those who want to easily adapt their system for imaging use. This can also mean eyepieces that have inbuilt illumination, or other technologically advanced eyepieces.
We offer packaged kits of various eyepieces, conveniently providing a full array of different magnifications and powers in one place. This let's you find numerous eyepieces that are all compatible with your telescope in one place. There's a very good reason to have numerous eyepieces as well: Each one is a different magnification and power, meaning that each one produces different views with your telescope, and is better for different targets. Having a full kit gives you the luxury of changing eyepieces as you change targets to tailor your experience for maximum enjoyment.
Eye relief (ER) is the distance your eye must be from the eyepiece lens to achieve focus. This is of importance to eyeglass wearers, who will likely prefer longer lengths to be comfortable, such as something over 15mm. This is a matter of comfort, however, and that comfort level is different for everyone. There are many who like long focal lengths who do not wear glasses while observing. If you are a first timer or are not very familiar with this factor, it is better to err on the side of long than short. Short eye relief will have your eye very close to the lens to focus.
Some eyepieces are designed with reticles on the lens or overlaid in the optical train of the eyepiece. These eyepieces are excellent for pursuits like polar alignment or guiding of any kind. They are also great for use with a finderscope to help you perfectly hone in on your desired target, providing a similar benefit to a crosshair. In general, these eyepieces will be most well suited to cases where accuracy is of the utmost importance.
Some eyepiece designs are best identified by their extremely wide field of view, which renders them excellent for deep sky astronomy. These eyepieces let you truly immerse yourself in the night sky, opening the doorway for you to witness truly stunning views of the night sky. It becomes possible to bear witness to broad swathes of stars in the sky, and a quality wide field eyepiece will be clear to the edge of field when doing so.
Ultra-Wide eyepieces are classified as those that go even beyond what is considered a wide field eyepiece, into a whole new level of immersive beauty. They tend to be over 82 degrees in field of view, and can be in the hundreds. These monstrously powerful eyepieces are similar in application to normal wide field eyepieces, but simply more so in most respects. These are the real heavyweights.
Some eyepieces are designed to be able to 'zoom' in and out, altering their magnification level through adjustment of the eyepiece. This permits one eyepiece to fill the roll of many, and is remarkably convenient for when you have numerous targets you want to observe in a single night. Zoom eyepieces are very cost effective due to this immense flexibility.