The Advantages of a Rich Field Telescope (RFT)
A Rich Field telescope is a somewhat perplexing term. Therefore, what does this imply?
What is a Telescope with a Large Field of View? They are low-magnification telescopes with a wide field of view. These binoculars provide se benefits, including viewing large sky areas.There are methods for studying the sky across a large area. Since certain astronomical bodies cannot be contained within a finite field, they are helpful. Additionally, the interfacial brightness of many giant galaxies is quite dim. This clearly shows that the region is large and fuzzy and that these characteristics are only visible at night. It’s easy to notice whenever there is a variation between one huge deep element and its surroundings. This contrast is possible only with a broad field of view. It implies that the telescope can observe a much more significant proportion of the sky in a glimpse. For beginners, this is critical.Attempting to locate objects in the night sky is one of a beginner’s most tough tasks! You typically choose something recognizable on a star chart and slide the telescope further into the desired position. The illustration below demonstrates this. It portrays Orion’s constellation, and the arrow points to the nebula we’re searching. This nebula is, nevertheless, difficult to see with the naked eye.
Consequently, you aim the telescope toward the nebula by first focusing on the closest dazzling star. However, this may be challenging if the telescope only observes a tiny portion of the sky. In your mind, imagine that you see through a straw. That is what is happening; you are peering through a single straw at a sliver of sky. As a consequence, it might not be easy to locate items.
On the other hand, a rich field telescope is a much larger straw. So much of the sky is visible via the eyepiece. Photos have shown the difference between a panoramic view from an ordinary telescope and a rich field telescope. It is crucial to notice that these telescope views have the same magnification. You are not distinguishing between the two. On the other hand, the rich field telescope gives a more incredible view of the sky. It reaches beyond the number three in the conventional telescopic perspective.
Comet hunters commonly prefer rich Field Telescopes, and they are ideal for seeing Galaxies and Nebulae. In most cases, however, a regular telescope will outshine when viewing the lunar planets. A rich field telescope’s classic view is now accessible.
What characteristics define a telescope with a large field of view? How does it come into existence?
It is crucial to remember the focus length. A conventional telescope’s focal length maybe eight times the mirror’s diameter. f/8 is the designation for this aperture. A rich field telescope’s lens or mirror is intended to have a significantly shorter focal length (as seen in the bottom figure). It will have a diameter of around 4-5 times that of the mirror or an aperture of f/4 or f/5. This causes the light to curve more steeply, providing you with a larger field of vision. Additionally, the telescope becomes shorter as a consequence of this modification.
Examples of Telescopes with a Large Field of View.
1. Orion Star-Seeker 80mm Direct-To-Refractor Telescope.
This fully computerized, electrically driven telescope with outstanding 80mm rich-field optics allows you to go to any of 4,000 celestial bodies with a few button presses on its LED hand controller. Wow! Any novice may readily access the night sky’s richest treasures on their first night out. The multi-coated 80mm (3/1″) achromatic lens is housed in a compact tube with a 1.25″ R&P optical, two Kellner eyepieces, a star diagonal, and a red-dot finder scope. Since just one mount is cast metal, it will outlast competing for Go-To scopes with several plastic components. The complete setup is highly portable and convenient to operate.
2. Maksutov Newtonian Comet Hunter OTA Telescope with Carbon Fiber Tube
The Exploring Science-based 152mm f/4.8 RFT is a large field of view telescope (RFT) that reveals dim objects with excellent spectral resolution. Explore Scientific has teamed up with comet hunter and author David Levy to create a Maksutov-Newtonian telescope supporting the Sharing the Sky Foundation. The Comet Hunter is equipped with a two-inch, 30mm zoom lens eyepiece with a substantial apparent field of 70°. When combined with the telescope’s short focal length, this eyepiece’s 6.2mm exit pupil gives an astounding 2.86° actual field of view. David Levy will autograph a certificate with every Comet Hunter limited edition telescope.
3. Astro View Refractor Telescope by Orion
The Astro View 120ST is a compact, rich-field refractor ideal for seeing nebulae, stars, and galaxies. It features a focal length of 600mm (f/5) and an aperture of f/5.6. This equates to a 66% increase in the field of vision for any eyepiece compared to our standard 120mm Astro View (f/8.3). The fast f/5 optical system also makes it an excellent telescope for astrophotography. This 120ST features a well-baffled optical tube, which ensures high contrast. The 2″ rack-and-pinion focuser is cast metal and fits lenses with “cross-sections” of 1.25″ and 2″. The Astro View equatorial setup with a movable aluminum tripod offers a firm basis for reliable tracking. Add an EQ-3M electronic drive as an alternative for a self-contained search. Buying includes a one-year limited warranty.
4. Mel Bartels’s Most Extensive Field Telescopes.
It turns out that when using a fast telescope with a widefield eyepiece, the average number of stars seen in the eyepiece is relatively constant at roughly 3000 stars throughout an aperture range of from 50mm to 32 inches. To see the most leads, the field of vision must be as broad as feasible at the lowest magnification possible. This is determined by the exit pupil and the AFOV of the eyepiece. Richest field indicates the presence of the most stars in the eyepiece.
In our galaxy, several possibilities have been discussed. Magnification enhancements would surely give an incredible view of celestial bodies, the Moon, planets, and details of sky objects. On the other hand, a Rich field telescope would be advantageous for seeing them. It is a high-resolution reflector that provides a wide field of view for seeing star clouds, nebulas, and large galaxies. Furthermore, this telescope is renowned for its breathtaking night sky views.