Astro-Tech - AT115EDT 115mm f/7 ED Triplet Refractor OTA

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Astro-Tech AT115EDT f/7 ED Triplet Refractor OTA   With the aperture of 115mm (4.53”),  Astro-Tech AT115EDT ED triplet apochromatic refractor gathers over 27% more light than the more common size. Combine this extra light gathering with the Astro-Tech AT115EDT triplet optics and state of the art optical multicoatings, you have a scope that outperforms similar refractors a fraction the price of comparable telescopes.

SKU: AST-AT115EDT
Manufactured by:
Astro-Tech
 

Product Description

 Astro-Tech AT115EDT refractor:
 
• 115mm f/7 fully multicoated triplet apochromatic optics with one ED center element 
•  dual-speed 2.5” rack-and-pinion focuser with 10:1 ratio  
•  2" dielectric-coated 99% reflectivity star diagonal with 2" and 1.25" compression ring 
•  rotatable focuser 
•  camera angle adjuster 
• retractable lens shade/
• dual hinged tube rings with a Vixen-style dovetail 
   With the aperture of 115mm (4.53”),  Astro-Tech AT115EDT ED triplet apochromatic refractor gathers over 27% more light than the more common size. Combine this extra light gathering with the Astro-Tech AT115EDT  triplet optics and state of the art optical multicoatings, you have a scope that outperforms similar  refractors  at a price as much as $700 less than a similar competitive scope!
    These exceptional optics are even more impressive when you consider the package they come in. The finely-machined scope has a dual-speed 2.5” rack-and-pinion focuser with a microfine 10:1 fine-focusing ratio. The focuser can rotate a full 360° to put your camera or eyepiece in the most comfortable observing position. In addition, a built-in camera angle adjuster lets you fine-tune the composition of your astrophotos. The supplied 2” and 1.25” eyepiece holders use non-marring compression rings that won’t scratch your eyepiece barrels. 
    This feature-laden 115mm Astro-Tech ED triplet apochromatic refractor offers more aperture for the same price as competitive triplet apos, and is priced hundreds of dollars less than competitive scopes with the same aperture. At the price, and for the exceptional performance, it is an absolute steal!
Features of this Telescope . . .
    ED apochromatic triplet refractor optics: 115mm (4.53”) aperture, 805mm focal length, f/7 focal ratio. It uses an ED (Extra-low Dispersion glass) center element to reduce spurious color halos and fringing to vanishingly low levels. All three lens elements are slow-polished for smooth surfaces, with less scattered light.
    Fully multicoated optics: The triplet objective lens has the latest state-of-the-art antireflection multicoatings on all air-to-glass surfaces for high light transmission and excellent contrast. This can easily be seen by looking into the objective lens of the scope. Virtually no reflection of your face will be seen. It’s a sure sign that the high transmission coatings are doing their job, by letting virtually all the light enter the scope, rather than reflecting some light back to your eye.
    Internal light baffles: Contrast-enhancing knife-edge light baffles in the 114mm diameter optical tube provide truly dark sky backgrounds and high terrestrial contrast. The edges of the lenses are blackened to reduce internal reflections and further improve image contrast.
    Dew shield: A self-storing retractable dew shield slows the formation of dew on the lens in cold weather to extend your undisturbed observing time. It also improves the contrast, similar to the effect of the lens shade on a camera lens, when observing during the day or when there is excessive ambient light at night, such as from a neighbor’s backyard security light. 
 
    Dual speed 2.5” rack-and-pinion focuser: The precision-made focuser has dual-speed focusing. There are two coarse focusing knobs. The right knob also has a smaller concentric knob with a 10:1 reduction gear microfine focusing ratio. This provides exceptionally precise image control during high magnification visual observing and critical CCD imaging. 
    The focus knobs have ribbed gripping surfaces so they are easy to operate, even while wearing gloves or mittens in cold weather. The focuser drawtube has 75mm of travel and a millimeter scale on the drawtube to let you return to an approximate focus when switching between visual and photographic setups. A lock knob under the focuser lets you lock in your photographic focus. 
    The 2.5” focuser can be rotated a full 360° to line up a camera in either a landscape or portrait orientation (or any orientation in between), as well as put a star diagonal and eyepiece into the most comfortable observing position. Simply loosen the knob on the top of the focuser housing, rotate the focuser to whatever angle is most convenient for you, and then tighten the knob to lock the focuser at the desired angle. 
    Built-in camera angle adjuster: In addition to the entire focuser rotating, the focuser drawtube’s 2" eyepiece/accessory holder includes a built-in camera angle adjuster that lets you quickly make final small adjustment tweaks to the angle of your camera or star diagonal without having to disturb the heavier focuser proper. This camera angle adjuster is standard equipment, not an optional extra-cost accessory, as it is with some other scopes. 
    A knob on the 2" eyepiece/accessory holder lets you unlock the accessory holder, rotate it to the desired final angle, then lock it in place at whatever angle is most convenient for you. Many observers will find this camera angle adjuster to be even more convenient that the focuser rotation system and will use this method of adjusting the viewing angle exclusively.
    Compression ring eyepiece holders: The focuser’s 2.5” drawtube terminates in a 2” eyepiece holder that uses a non-marring compression ring to hold a 2” star diagonal and/or accessories in place. The compression ring won’t scratch the barrel of your star diagonal and accessories as an ordinary thumbscrew can. 
    A supplied 1.25” accessory adapter slips into the 2” eyepiece holder to let you use a 1.25” star diagonal, image erecting diagonal, or photographic accessories. Like the 2” eyepiece holder, the 1.25” adapter also uses a non-marring compression ring to hold 1.25” star diagonals and accessories in place. 
    Star diagonal: An Astro-Tech 1/10th wave 2” star diagonal with durable 99% reflectivity dielectric multicoatings is standard equipment. 
    Optical tube: The 27.25" long optical tube and focuser (32.4" long with lens shade extended) are finished in a durable white and black powder coated finish, with black anodized trim. There is a finderscope mounting shoe that accepts Vixen-style finderscope mounting brackets. The shoe can be mounted on either the top left or top right side of the focuser body. A slip-on metal dust cap is standard, as is a dust seal for the eyepiece holder.
    Tube rings and dovetail: Dual split hinged tube rings are supplied for the 114mm o. d. optical tube. The rings are lined with white felt that will not stain the white finish of the scope over time, unlike the black felt supplied with other scopes. A 7.9" long Vixen-style dovetail is bolted to the tube rings. Optional Losmandy-style D-plate dovetails are available if your mount uses a wider Losmandy-style saddle. 

Specifications

Name Astro-Tech - AT115EDT 115mm f/7 ED Triplet Refractor OTA
Manufacturer Astro-Tech
Model AST-AT115EDT
In The Box 115mm f/7 ED Triplet Refractor Optical Tube Dual-Speed 2.5” Rack-and-Pinion Focuser - Rotatable 2" dielectric-coated 99% reflectivity star diagonal with 2" and 1.25" compression ring Camera angle adjuster Retractable lens shade Dual hinged tube rings with a Vixen-style dovetail
Aperture 115mm
Dew shield Retractable - Included
Dovetail Compatibility Includes V-series Dovetail
Focal Length 805mm
Focal Ratio f/7
Focuser 2" Rack and Pinion Dual Speed Focuser 10:1 Ratio
Highest Useful Magnification 230x
Limiting Stellar Magnitude 12.8
Optical Tube Weight 13 lbs.
Resolution 1.01 arc seconds
Tube Ring Dual Rings Included
Warranty 1 Year

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In the Box

115mm f/7 ED Triplet Refractor Optical Tube
Dual-Speed 2.5” Rack-and-Pinion Focuser - Rotatable
2" dielectric-coated 99% reflectivity star diagonal with 2" and 1.25" compression ring
Camera angle adjuster
Retractable lens shade
Dual hinged tube rings with a Vixen-style dovetail

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