Vixen | Producer of optics from astronomical telescopes and binoculars
Vixen Telescope AP-SD81SII・SM
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Suggested retail price: Contact local dealer
- JAN
- 4955295261741
SD81SII telescope set
This set includes a compact SD81SII optical tube with the high-performance SD objective lens, an AP-SM equatorial mount assembled from modules, and a lightweight APP-TL130 tripod. Eyepieces are also included as standard accessories, allowing you to start observing immediately by simply connecting a power source or inserting batteries.
The SD81SII, the successor to the SD81S telescope, offers improved imaging performance thanks to a newly introduced ring spacer that eliminates light streaks.
Vixen Telescope AP-SD81SII・SM Description
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SD81SII Optical Tube Assembly + AP-SM Equatorial Mount + APP-TL130 Tripod
The package includes a compact SD81SII optical tube with the high-performance SD lens, an AP-SM equatorial mount, and an APP-TL130 tripod. Two eyepieces are also included, allowing you to start observing immediately after setup.
*Power supply sold separately. Compatible with AA batteries or USB mobile power sources. -
SD81SII Optical Tube Assembly
A high-performance photo-visual SD81SII featuring an SD (Super ED) glass lens that effectively suppresses chromatic aberration for clear and sharp star images. Its F7.7 focal ratio provides a well-balanced 625 mm focal length with an 81 mm effective aperture, making it suitable for a wide range of applications, from planetary observation to photographing nebulae and star clusters.
When combined with an SD Reducer HD Kit and an SD Flattener HD Kit (both sold separately), it achieves a 44 mm image circle, covering the full-frame DSLR sensor. The conventional three spacers around the objective lens have been replaced with a ring-shaped spacer, eliminating light streaks and producing aesthetically pleasing star images.
The optical tube comes with a Flip Mirror Diagonal that allows quick changing between eyepieces of different magnifications with a dial. Switching from naked-eye viewing to astro-imaging is easy by directing the flip mirror to a camera that is attached to the straight-through viewing path. A dovetail slide bar M allows the optical tube to be positioned at its center of gravity, and a metal carry handle enables quick attachment, detachment, and transport.
These features combine to deliver excellent performance across a wide variety of astronomical observing and astrophotography scenarios. -
The AP Equatorial Mount combines Surprising Lightness with Easy Operation, offering a Full-fledged Telescope System.
This lightweight and compact equatorial mount weighs just 3.9 kg (excluding counterweights). Easily point the optical tube in any direction by hand and release—it will begin celestial tracking automatically. The combination of the R.A. motor and friction-stop system allows even beginners to use it immediately without complicated operations. For finer directional adjustments, you can use the included handheld controller or the manual fine adjustment knob.
The mount can operate independently with four AA batteries (commercially available) or a USB mobile battery, making it suitable for long observation sessions. Rough polar alignment is easy for everyone using an optional Polar Meter, allowing beginners to set up the telescope quickly. By installing the optional polar alignment scope PF-LII, accurate polar alignment will be achieved with ease. -
STAR BOOK ONE Controller Included
You can enjoy comfortable astronomical observation by taking full advantage of the various functions offered by the STAR BOOK ONE controller.
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Modular Structure
By rearranging modules and adding optional components, you can configure the system to suit your needs and skill level, allowing a single piece of equipment to be used effectively for many years.
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APP-TL130 Tripod
It features three-section telescopic legs that extend to 130cm, the same length as a standard astronomical telescope tripod, yet can be shortened to about 60cm for compact storage. It combines the sturdiness of a telescope tripod with the portability and ease of storage of a camera tripod. The legs have two options at their feet, a common feature on camera tripod legs, allowing you to use either rubber or spike feet, depending on your setup. Rubber tips are recommended for indoor use to protect the flooring. In addition to use with the AP series mounts, it is also compatible with the GP2 equatorial mount and the Porta II altazimuth mount.
Specifications
Optical Tube Part
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Objective Lens (Primary Mirror) / Effective Aperture81mm SD Apochromat Multi-Coated
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Focal Length (Focal Ratio F)625mm（F7.7）
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Resolution・Limiting Magnitude1.43 arc sec., 11.3 mag.134x unaided eye
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Size・WeightLength 585mm, outer diameter 90mm, 3.6kg (Main body 2.3kg)
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Finder ScopeXY Red Dot Finder Ⅱ (one-power aiming device)
Eyepiece Part
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Focusing SystemRack and Pinion
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Threads / Visual BackScrew-in / 60mm, 42mm T-ring screwPush-fit: 50.8mm, 31.7mm (with Flip Mirror Diagonal)
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Eyepiece (31.7mm barrel)SLV20mm (31x, 97min. actual field of view)SLV5mm (125x, 24min. actual field of view)
Tripod
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Material・FormLarge hexagonal aluminum two-stage extension legs (one-touch type)
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Size・WeightLegs 570⇔1,296mm in length, Height (from ground) 526⇔1,159mm. 598.4mm overall tripod lengthSetting radius 350⇔710mm・3.0kg
Others
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Main AccessoriesParts case, counterweight 1kg x 1, 1.9kg x 1
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Solar ObservationUsed with a Sun Projection Screen Set B (sold separately) (for short-term observation)
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Weight13.5kg (excluding eyepiece)
Set Contents
- SD81SII OTA
- AP-SM Mount
- APP-TL130 Tripod
- Eyepiece SLV20mm
- Eyepiece SLV5mm