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Vixen VSDF90SS Telescope with Tube Ring

$4,899.97

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- Olivia 

I plugged this scope in and attached the pointer and saw Saturn Jupiter Neptune and Mars and close ups of the moon. On the first night. This is just what I wanted. .| Verified Purchase"

Main Benefits:

  • Aperture & Focal Length: 90mm objective lens with a focal length of 495mm, resulting in a fast f/5.5 focal ratio. This wide aperture allows for gathering more light and capturing fainter deep-sky objects, while the fast focal ratio is ideal for astrophotography, reducing exposure times.
  • Mount type: This telescope is not sold with a mount, so you will need to purchase one separately. It is compatible with a variety of equatorial mounts that can track the movement of the stars across the night sky.
  • Optics: The telescope features a 5-group, 5-element objective lens design with two SD (Super ED) lenses and one high-refractive index ED lens. This combination of lenses effectively corrects for chromatic aberration, both axially and laterally, ensuring sharp and color-accurate images across the entire field of view, even at the edges.

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Features

  • An ultimate 5-group 5-element fast-ratio astrograph for both photo- and visual astronomers
  • 5-group and 5-element design (two SD lenses) realizes extremely high-level correction for aberration
  • Significant improvement in peripheral light intensity
  • Exhibiting high performance even in visual observation from low to high magnification
  • Compatible with ZWO EAF (focuser)

Description

An ultimate 5-group 5-element fast-ratio astrograph for both photo- and visual astronomers. 
The flagship model pursues maximum performance and ease of use for both astrophotography and visual observation. Uncompromising optical design gorgeously using two top grade SD and one high-refractive index ED lens in convex lens and high-quality lanthanum glass for concave lens achieved successfully much more excellent aberration correction than the conventional VSD100F3.8 ensuring extraordinary sharp, beautiful and uniform star images from the center of the field to the edge of the large format 44 x 33mm as well as the 35mm full size. As an astrograph, VSD90SS also offers excellent visual observation ranging from star observation in a wide field of view to planetary observation at high magnification.

5-group and 5-element design (two SD lenses) realizes extremely high level correction for aberration. 
Vixen VSD90SS is optically designed focusing on correction of axial chromatic aberration employing two SD and one high-refractive-index ED lenses for the convex lens and newly developed high performance lanthanum-based glass for the convex lens. In particular, the newly attempted use of two SD lenses (almost the same diameter) is a new attempt successfully suppressed at an extremely high level the deterioration in color of the star image and the distortion of the star image due to focus and squaring shifts, and both image formation and peripheral image performance exceed those of the VSD100F3.8. From shooting to image processing, you can expect consistently easy-to- use and stable shooting results.

Significant improvement in peripheral light intensity.
The helicoid focuser in the previous model VSD100F3.8 which was inherited from its parent PENTAX 100SDUFII limited the diameter of the rear lens group. In order to eliminate this restriction, the VSD90SS employed a rack and pinion focuser and increased the diameter of the rear lens group.
VSD90SS greatly improved vignetting compared to VSD100F3.8. In addition, vignetting is reduced, there is almost no vignetting due to the optical system, and non-axisymmetric flares of bright stars caused by light diffraction are also prevented. With little vignetting and plenty of peripheral illumination, it is possible to maintain abundant gradation in the periphery of the field of view, and also to facilitate peripheral illumination correction during image processing. * Depending on the shooting system, vignetting may occur due to the camera body or camera mount.

Exhibiting high performance even in visual observation from low to high magnification.
When observing at low magnification and wide field of view, the image surface is very flat, and when combined with high-quality eyepieces, a sharp image spreads over the entire field of view. Furthermore, the center of the field of view boasts a multi-wavelength Strehl intensity of 96.7%. The image formation performance exceeds 95.7% of the SD81SII, which has a reputation as a high-performance apochromat, making it also suitable for high-magnification observations of planets and other objects.

Compatible with ZWO EAF (focuser)
Compatible with dual speed focuser and ZWO EAF (focuser) (cannot be used both together).

Specs

Objective D:90mm SD Apochromat, 5-Group/5-Element, AS-coated
Focal Length 495mm (F/5.5)
Resolving Power 1.29 arc seconds
Limiting Magnitude 11.5
Light Gathering Power 165x unaided eyes
Image Circle Dia. 60mm (Illuminated over 90% at most edge)
Tube Size L:403mm/597mm(retracted) x OD:115mm
Focuser Rack & Pinion
Adapter Thread 84mm(P=1mm), 60mm(P=0.75mm) and 42mm for T-ring
Visual Back 60.2mm, 50.8mm and 31.7mm push-fit
Optional Accessories Universal dovetail plate, Reducer V0.79x, Camera mount adapter for 645D, 7x50mm Finder II, 50mm XY finder bracket II, Scope case, Eyepieces, Dual speed focuser
Weight 4.3kg

Warranty

Vixen warranties its products to be free from initial defects in materials and workmanship for a specified period based on part type:

Vixen Electronic Parts: Limited One Year Warranty

Vixen Mechanical Parts: Limited Two Year Warranty

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Vixen VSDF90SS Telescope with Tube Ring

Additional Features

Rack and pinion focuser: This focuser provides smooth and precise focusing for both visual and astrophotographic use.

60mm image circle: The large image circle ensures that your camera sensor is fully illuminated, even with large format cameras.

Vixen-style dovetail: The dovetail allows for easy attachment to a compatible equatorial mount.

Integrated dew shield: The dew shield helps to prevent dew from accumulating on the objective lens, which can degrade the image quality.

Compatible with ZWO EAF: This telescope can be used with the ZWO Electronic Autofocuser for automated focusing in astrophotography.

Vixen VSDF90SS Telescope with Tube Ring

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Explore the vast wonders of the universe with the NT114CF telescope, boasting an impressive 114mm aperture and a swift focal ratio of f/4.4.

Its remarkable light-gathering capability provides captivating views of planets and radiant deep sky objects, revealing intricate celestial details with astonishing clarity.

Whether delving into distant galaxies or observing the lunar landscape, this telescope ensures effortless capture of celestial marvels.

Vixen VSDF90SS Telescope with Tube Ring

Seamless Celestial Exploration: Navigate the Night Sky with Effortless Pan and Tilt Control

Embark on seamless cosmic adventures with the NT114CF telescope's intuitive pan and tilt control of the alt-azimuth mount.

Experience fluid and precise movements as you embark on celestial quests, from tracking elusive nebulae to witnessing planetary alignments.

Whether you're a seasoned astronomer or a novice enthusiast, this telescope offers seamless navigation for unforgettable stargazing experiences.


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Aperture size is the diameter of the main lens or mirror in a telescope, and it is the most important factor in determining how much light the telescope can gather. More light means brighter and more detailed images. Generally, larger apertures are better, but they also tend to be more expensive and bulkier.

Magnification is important for making objects appear larger, but it does not create more detail. Aperture is more important for determining the overall quality of the image, including its brightness, resolution, and contrast. However, magnification can still be useful for getting a closer look at specific features of an object that you can already see with lower magnification.

All telescopes are affected by light pollution to some extent, but Dobsonians and reflectors are generally less affected than refractors. This is because refractors have more internal surfaces where light can bounce around and cause glare. If you live in an area with a lot of light pollution, you may want to consider a Dobsonian or reflector, or find a dark observing location.

The essential accessories for your telescope will depend on your specific needs and interests. However, some common recommendations include:
Extra eyepieces: This will allow you to change the magnification of your telescope to suit different observing conditions and objects.
A finder scope: This is a small, low-power telescope that helps you aim the main telescope at the correct area of the sky.
A collimation kit: This is used to adjust the alignment of the mirrors in a reflector telescope.
A star chart or planisphere: This will help you identify objects in the night sky.

Dobsonian telescopes are generally the easiest to set up, as they typically only require placing them on the ground and aligning the finder scope. Refractors and reflectors may require more assembly and alignment, but the process is not overly complicated. Many telescopes come with instructions and online resources can also be helpful.

You may need a few basic tools, such as a screwdriver or Allen wrench, to assemble some telescopes. However, you do not need any special knowledge to get started. There are many resources available to help you learn how to use your telescope, such as online tutorials, books, and astronomy clubs.

Here is a general guide to what you can expect to see under typical observing conditions with different telescope apertures:

50mm-70mm: You can see the phases of Venus, the moons of Jupiter, and some brighter deep sky objects like the Andromeda Galaxy and the Orion Nebula.
70mm-100mm: You can see more detail in the planets, including the rings of Saturn and the cloud bands on Jupiter. You can also see more faint deep sky objects.
100mm+: You can start to see more challenging deep sky objects, such as galaxies, nebulae, and star clusters. You can also see more detail in fainter objects like comets and asteroids.

We are often advised that you are able to see them through any small telescope, or even binoculars. But you really need a telescope with at least 40 times magnification to clearly see the detail of the rings as separate from the planet. And the bigger the telescope, the better.

For Galactic Observations: A reflecting telescope with a larger aperture (150mm-250mm) and a moderate focal length (750mm-1250mm) is ideal for capturing distant galaxies. Telescopes such as the Orion XT8 or the Celestron Advanced VX 8" offer excellent light-gathering capabilities and versatility.

Optical telescopes, for example, can see objects up to billions of light-years away, while radio telescopes can detect signals from even further distances. However, when it comes to observing the universe's earliest moments, telescopes can only see so far.

In general, a top-quality 4-inch refractor shows deep-sky objects about as well as a 5-inch reflector or catadioptric, and might even do a bit better on the planets. Most telescopes with apertures of 80 mm or less are refractors.

Refractor Telescopes: Refractors use lenses to gather and focus light, offering crisp and clear images. They are excellent for planetary observation due to their ability to provide high contrast and detailed views.

Some of the most newly detected objects may be over 13 billion light years away, as derived from a standard model of the Universe. However, a powerful new generation of telescopes, like the James Webb Space Telescope, will be needed to confirm the suspected distances of these objects.

The most important aspect of any telescope is its aperture, the diameter of its main optical component, which can be either a lens or a mirror. A scope's aperture determines both its light-gathering ability (how bright the image appears) and its resolving power (how sharp the image appears).

The telescope you want has two essentials: high-quality optics and a steady, smoothly working mount. And all other things being equal, big scopes show more and are easier to use than small ones, as we'll see below. But don't overlook portability and convenience — the best scope for you is the one you'll actually use.

With just a small or medium-sized telescope, skygazers can easily observe planets. You'll be surprised how much of our solar system you can see! And you don't need a dark sky to view all of our solar system's planets; even under city lights, Venus, Mars, Jupiter and Saturn can be easy to see with a telescope.

In summary: Refractors generally have the edge over reflectors for a quality image, both from the standpoint of lens/mirror quality and precision optical mountings, and lack of central obscurations.


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