When you're considering a refractor telescope for astronomy, whether for yourself or as a gift for someone interested in stargazing, the numbers in the product name can seem cryptic. The HEXEUM AZ50070 model uses straightforward naming that actually tells you exactly what you're getting: a 70mm aperture telescope with a 500mm focal length. Understanding what these numbers mean is the first step toward choosing the right telescope for your needs.

What Do Those Numbers Actually Mean: 70mm and 500mm

The 70mm refers to the aperture, which is the diameter of the main lens at the front of the telescope. Think of this as the light-gathering power of your instrument. A larger aperture collects more light, which means you can see dimmer objects and get brighter, clearer views. The 500mm is the focal length, which affects magnification and field of view. Together, these create what's called the focal ratio (f/7.1 in this case), which influences how wide your field of view is.

For beginners and kids, a 70mm aperture sits in a practical sweet spot. It's large enough to show you interesting detail on the moon, the rings of Saturn, and Jupiter's cloud bands, but it's not so large that the telescope becomes unwieldy or requires a motorized tracking mount to keep objects in view. You can actually use it without needing an observatory or professional setup.

Understanding Magnification and Eyepieces

Many people assume that magnification is everything when buying a telescope, but that's where most beginners get it wrong. A telescope's maximum useful magnification is limited by its aperture and atmospheric conditions. More magnification doesn't automatically mean better views; it often means darker, shakier images if you push beyond what the telescope can deliver.

The HEXEUM AZ50070 comes with two eyepieces: a 25mm and a 10mm. These create different magnification levels depending on the focal length of your telescope. The included 3x Barlow lens multiplies the power of each eyepiece, effectively tripling your magnification options without requiring you to buy additional eyepieces. This is genuinely useful because it lets you start with lower magnification to locate objects (using the 5x24 finderscope helps here), then increase magnification for detailed viewing once you've found what you're looking for.

Is This Telescope Right for You

A refractor telescope like this one works well if you're interested in observing the moon, planets, and brighter deep-sky objects like star clusters. They're straightforward to use, require minimal setup, and don't need regular maintenance like reflecting telescopes do. The sealed optical tube keeps dust and moisture away from the glass surfaces.

The HEXEUM model includes practical features that matter for actual use: an aluminum tripod for stable viewing, a phone adapter so you can photograph what you see, and a carrying bag if you want to take it to dark-sky locations. The wireless remote control lets you take pictures without touching the telescope and introducing vibration. These aren't luxury additions; they're genuine conveniences that make the difference between a telescope that sits in a closet and one you'll actually use.

Caring for Your Refractor Telescope

One advantage of refractor telescopes is that they require less maintenance than other types. The HEXEUM AZ50070 comes with fully multi-coated optics, which means the glass surfaces have protective layers that reduce light loss and improve image clarity. You shouldn't need to replace these coatings under normal use.

Keep the lens caps on when you're not observing. Avoid touching the glass surfaces with your fingers. If you do need to clean the objective lens, use a soft brush or compressed air first, and only use lens paper and appropriate cleaning solution if absolutely necessary. Store the telescope in its carrying bag in a dry location, and allow it to reach ambient temperature before observing on cool nights to avoid internal condensation.

Is This a Good First Telescope

The HEXEUM AZ50070 works well as an entry point into practical astronomy. It's portable enough to take places, straightforward enough that you won't spend an hour setting it up before you can observe, and capable enough to show you genuinely interesting celestial objects. The included accessories mean you won't need to immediately buy additional equipment to get started. The company offers lifetime maintenance support, which provides some reassurance if you encounter questions or issues as you learn how to use it.

The product in this guide: Telescope for Kids & Adults - 70mm Aperture 500mm AZ Mount Fully Multi-Coated Optics Astronomical refracting Portable Telescopes, with Tripod Phone Adapter, Carrying Bag, Remote Control White