Apertura 21 mm Panorama 82° 2" Eyepiece

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Stunningly Sharp, 82° Views
As a team of dedicated night sky enthusiasts themselves, Apertura has a full understanding of the needs of observers and continues to develop remarkable tools to enhance your stargazing endeavors. This Panorama eyepiece series is no exception, offering a wide 82° AFOV that expands across the majority of your field of vision. To put this into perspective, a 50° eyepiece of the same focal length will yield the same magnification, though the 82° Panorama eyepieces present more of the sky around your selected targets. As a result, you’ll be enveloped by a riveting “spacewalking” sensation when peering through your telescope, where it’s as if the eyepiece practically disappears! These cinematic views are available for users of SCTs, Dobsonians, refractors, and many other types of telescopes, making it a great addition to any setup.

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Top-Tier Build Quality
Apertura is a top performer when build construction is concerned, crafting these eyepieces with premium materials to ensure the utmost longevity. In comparison to other 82° eyepieces on the market, the Apertura Panorama eyepieces utilize a rigid stainless steel barrel to ensure integrity for years to come. This dedication to quality continues with the design of the flexible, yet durable eyecups. Made of soft rubber, these eyecups deliver maximum comfort during observations, with the option to fold them up or down for personalized eye placement. Within the eyepiece, each lens is fully multicoated with anti-reflective finishes for maximum light throughput. The result? Bright, vivid detail and outstanding clarity. When tested against TeleVue Nagler and Delos eyepieces, the Apertura Panorama eyepieces present image quality and sharpness in step with these elite models, a fantastic feat for eyepieces within this price range!

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21 mm of Focal Length
In order to unlock the full potential of your telescope’s light gathering power, it’s important to pair your telescope with the right eyepiece for maximum resolution and clarity. The ratio of telescope focal length and eyepiece focal length (i.e. your system’s magnification), will help you determine which celestial objects could be viewed and how clear your overall image will be based on your local seeing conditions. The formula for magnification is as follows: Telescope Focal Length ÷ Eyepiece Focal Length. Pairing this 21 mm Apertura Panorama Eyepiece with a standard 1200 mm focal length Dobsonian yields a magnification of 57x—making it wonderful for up-close sights on a wide variety of deep-sky objects. If you're interested in how much of the actual sky will be presented within your eyepiece, we can calculate the true field of view (TFOV) with the following equation: TFOV = AFOV ÷ Magnification. Taking our previous example with a 1200 mm focal length Dobsonian, we can see our TFOV will be 1.43°, a great scope of vision for the Eagle Nebula, the Triangulum Galaxy, and the Orion Nebula. To take a deeper dive within this topic, take a look at our Ultimate Telescope Eyepiece Guide found within our Astronomy Hub.

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Understanding Exit Pupil
Your exit pupil is the beam of light exiting your eyepiece, and it’s an important factor in determining how bright the image through an eyepiece will be. We measure the exit pupil by its diameter in millimeters, with the bigger the diameter, the brighter the image. Exit pupil is calculated with the following equations: Exit Pupil = Telescope Aperture (mm) ÷ Magnification, or Exit Pupil = Eyepiece Focal Length ÷ Telescope Focal Ratio. Large (5-7 mm) and medium (2-5 mm) exit pupils are wonderful for deep sky objects. Small exit pupils, on the other hand, perform well for small, bright objects like the planets or the lunar craters. This Apertura Panorama Eyepiece has a focal length of 21 mm. When paired with a standard f/6 telescope, the resulting exit pupil will be 3.55 mm, making this eyepiece a great choice for observing large, dim deep sky objects!

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Add Filters with Ease!
Filters are a wonderful way to enhance your observing sessions as they open the doors to details that otherwise would have gone unnoticed. Thankfully, adding a filter to your Panorama eyepiece is a piece of cake! Simply thread in a 2” filter to the bottom of your eyepiece, then insert your eyepiece into your telescope as normal. Apertura also offers a host of filters for add-on to help get you started. Whether you plan to enhance nebulous structure with the UHC filter, reduce the effects of urban lighting with the Moon and Skyglow filter, or amplify the surface details on the Moon with the variable polarizing filter, Apertura helps you do so with ease!

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Comes with the Apertura Absolute Warranty!
The Apertura Absolute Warranty provides two years of coverage against product defects. After the initial two-year warranty expires, this product qualifies for Apertura's Three-Year Accident Replacement Program. In addition, the Apertura Absolute Warranty is transferrable! Download a copy of the Apertura Absolute Warranty for more information on this program, how to make a claim, and why it is important to keep your original receipt and the product's original boxes & packaging!