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EYEPIECES

Introduction To Our Eyepieces

Your telescope’s eyepiece is more than a simple accessory. It sets the magnification

and field of view of your optical system and is a critical component in determining how

profoundly you connect with the cosmos. Designed to provide wide fields of view for a full

immersion experience, Explore Scientific’s premium eyepieces ensure stunning detail

with high-end optics that allow your telescope to reach its full potential. We offer five

series of eyepieces that differ in factors like field of view, available focal lengths, barrel

diameter and eye relief. However, they all share characteristics that guarantee superior

image quality. For peak performance, each of our precision eyepieces offers lenses made

of low-dispersion glass with a high refractive index. In addition, each lens is fully multi-

coated with durable enhanced multi-layer deposition (EMD) coatings. The combination of

these factors brilliantly captures the celestial wonders you seek with sharp contrast, high

resolution and crisp definition. To protect the precision optics, the body of each eyepiece

is O-ring sealed and purged with an inert gas (either argon or nitrogen) for a waterproof

environment that is impervious to internal fogging and prevents contaminants like fungus

and dust from entering. Each also offers foldable soft silicone rubber eyecups to provide

the most comfortable viewing experience and a filter thread on the backside that will

allow for use of moon or light filters.

There are two distinct types of field of view to consider in any eyepiece. The first of

these is apparent field of view (AFOV). Expressed in degrees, the AFOV is the perceived

angle from your eye to the edges of the field stop of an eyepiece. The larger the AFOV,

the more area you will see. With AFOVs ranging from a wide 68° to a hyper-wide 120°,

our five lines of eyepieces will open up vast expanses of inky black sky for you to explore.

To provide views that are truly stunning, each eyepiece model is designed with the

distinct number and configuration of elements (optical lenses) needed to ensure a well

corrected field of view is maintained as the angle widens. The benefits of our wide field

eyepieces go beyond the amount they reveal. When you have more sky to work with,

objects are easier to locate and stay in the field of view longer, which translates to fewer

adjustments. This is especially helpful when you are using a non-driven mount. These

eyepieces also allow the viewer to use averted vision, which is a technique that aids in

observing faint objects. When using averted vision you gaze slightly to the side of your

target object rather than directly at it. This puts the image on a part of your eye that is

more sensitive to light, which allows you to enjoy fainter objects. The second type of

field of view is true field of view (TFOV), which is the actual field of view of the sky or

terrestrial scene expressed in degrees and/or fractions of a degree as seen through

a telescope/eyepiece combination. To calculate the TFOV, you will divide the apparent

field of view by the magnification. For example, if the resulting magnification from

your telescope and eyepiece set-up is 50x and your eyepiece has a 100° AFOV, you will

divide 100 by 50 to get a TFOV of 2°. TFOVs usually range between .25° to 2 degrees.

FIELD OF VIEW

1,000m

125m

7.0˚

8x Binoculars

7.0˚

52.1˚

Содержание TWILIGHT Series

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Страница 2: ...n this impressive coverage all you have to do is register your Explore Scientific branded telescope within 60 days of purchase We encourage you to do so today so your telescope can be protected for a lifetime To activate your Explore STAR warranty simply register the product with Explore Scientific within 60 days of purchase To complete your registration select one of the following options Visit h...

Страница 3: ... can give you the contrast and crispness you need to capture the night sky s treasures in stunning detail CAPTURE Watching people s face light up when you show them Saturn s elegant rings or the Moon s chiseled terrain for the first time is a rewarding experience By taking your Explore Scientific telescope out to a star party a street corner or any outreach event you can share your eyepiece and aw...

Страница 4: ...nprecedented level of satisfaction We think of our telescopes as more than products They are gateways to the universe that will broaden your perspective by revealing the intricate beauty of our nearest neighbors as well as the bounty of celestial wonders that lie well beyond our humble solar system The adventures this telescope can send you on are immeasurable and we encourage you to enjoy it full...

Страница 5: ... OF CONTENTS AR Doublet Series ED Triplet Essential Series Carbon Fiber Series Twilight Series Mounts Eyepieces Finder Scopes Focusers Share The Sky Table of Contents 6 9 10 13 14 17 18 22 23 25 26 28 29 31 32 ...

Страница 6: ... point either at or near the Sun Do not look through either when you are moving the instruments during the daytime Never allow anyone to use the telescope or a finder scope during the daytime without warning them of the hazards of aiming either at or near the Sun Make sure that they are adequately trained on the use of these instruments before allowing them to start observing Children should alway...

Страница 7: ...user The 1 25 eyepiece adapter or 2 eyepieces can be secured in the diagonal by tightening the tension screws on the compression ring lock The 1 25 adapter also has a compression ring to secure eyepieces that are inserted into it CRADLE RINGS Please note On our 102mm AR Doublet Achromatic Refractor you will need to install the finder scope before you put on the cradle ring assembly On all of our o...

Страница 8: ...mm AR Doublet Achromatic Refractor you will need to install the finder scope before you put on the cradle ring assembly On all of our other telescope models the finder scope can be installed after the cradle rings are in position Each scope in our AR Doublet Series comes with a non illuminated straight finder scope This classic reverse view finder scope has a simple crosshair that can be centered ...

Страница 9: ...epiece in and defocus the image until the star develops distinct rings Be careful not to throw the image too far out of focus because you may lose the rings To align the lenses you will need to manipulate the push pull tilt system by making adjustments at one or more of the three points To loosen and tighten these screws you will need a 2 5mm hex wrench if you have a 80mm or 102mm model a 3mm hex ...

Страница 10: ...er scope to look at or near the Sun Even momentary visual contact with the Sun s light rays can instantly cause irreversible damage to your eye s Eye damage can be painless so there is no warning to the observer that damage has occurred until it is too late Take extra care when using the telescope or a finder scope during daylight hours and do not point either at or near the Sun Do not look throug...

Страница 11: ...shield is an important part of your telescope because it slows moisture build up on the objective lens and can reduce image interference caused by ambient light We advise using the dew shield when possible to maximize these crucial benefits For the 80mm 102mm and 127mm models the dew shield is an easy to operate retractable style that slides smoothly up and down the optical tube assembly with no i...

Страница 12: ...pletely Instead you can undo the lock on each ring so that the tube is loose enough in the rings to slide back and forth or rotate Be careful to hold the tube securely so that you do not lose control of it while the cradle rings are loose Once the tube is in the desired position be sure to retighten each lock Finding the right placement of the cradle ring assembly involves finding your individual ...

Страница 13: ...er eyepiece in and defocus the image until the star develops distinct rings Be careful not to throw the image too far out of focus because you may lose the rings To align the lenses you will need to manipulate the push pull tilt system by making adjustments at one or more of the three points To loosen and tighten these screws you will need a 2 5mm hex wrench if you have a 80mm or 102mm model a 3mm...

Страница 14: ... a basic assembly process that will have you at the eyepiece and under the stars in no time SUN WARNING DO NOT use this telescope or any accompanying finder scope to look at or near the Sun Even momentary visual contact with the Sun s light rays can instantly cause irreversible damage to your eye s Eye damage can be painless so there is no warning to the observer that damage has occurred until it ...

Страница 15: ... advise using the dew shield when possible to maximize these crucial benefits For the 80mm 102mm and 127mm models the dew shield is an easy to operate retractable style that slides smoothly up and down the optical tube assembly with no installation required On the 152mm model the dew shield is stationary and must be attached using the included set screws To do this remove the optical tube assembly...

Страница 16: ...k and forth or rotate Be careful to hold the tube securely so that you do not lose control of it while the cradle rings are loose Once the tube is in the desired position be sure to retighten each lock Finding the right placement of the cradle ring assembly involves finding your individual scope s balance point which depends largely on the accessories you will be using Before attempting to find th...

Страница 17: ...ne adjusting screw and two locking screws at each point Using a low power eyepiece center a bright star in the field of view Place a high power eyepiece in and defocus the image until the star develops distinct rings Be careful not to throw the image too far out of focus because you may lose the rings To align the lenses you will need to manipulate the push pull tilt system by making adjustments a...

Страница 18: ...hat will allow you to angle the head mount enough for some telescopes to point at the zenith Ideally suited for star parties and outreach the Twilight II mount can accommodate two telescopes at once and hold up to 60 pounds The movement of the heavy duty mount is controlled by large chrome dials that are simple to manipulate even when you have on gloves It also comes with an 8 inch pier extension ...

Страница 19: ...d it is important to use proper lifting techniques to prevent back injury and or strained muscles TWILIGHT I ASSEMBLY AND USE To begin assembly take the tripod out of its box and remove the plastic wrap Spread the legs fully apart and make sure the two tension screws on each leg are tight Once you have finished assembling the mount you can adjust the tripod height by loosening these tension screws...

Страница 20: ...s great for daytime terrestrial viewing and many astronomical observing situations However the mount can be easily moved to a 60 angle to view steeper expanses of space and even point some telescopes to the zenith To change the angle of the head mount remove the two socket head screws that hold the fork arm in place with the provided 4 5mm hex wrench These screws are located on the side of the for...

Страница 21: ...er extension comes in two parts To begin take the large cylinder and remove the three screws from the bottom using a 4mm hex wrench Take the base piece of the head mount insert it into the bottom of the pier align the holes and rethread the three screws so that the pieces are securely joined Take the top piece of the pier extension and twist the threaded end into place atop the cylinder Tighten th...

Страница 22: ...zontal azimuth movement of any mounted telescopes To move the telescope s up and down loosen the dial on the top find your desired position and retighten the dial To move the telescope s side to side loosen the dial on the side find your desired position and retighten the dial Normally both sides of the head mount share the same angle However if you would like to change the angle on one without af...

Страница 23: ...irst of these is apparent field of view AFOV Expressed in degrees the AFOV is the perceived angle from your eye to the edges of the field stop of an eyepiece The larger the AFOV the more area you will see With AFOVs ranging from a wide 68 to a hyper wide 120 our five lines of eyepieces will open up vast expanses of inky black sky for you to explore To provide views that are truly stunning each eye...

Страница 24: ... night sky has to offer EXIT PUPIL The exit pupil is the diameter of the beam of light coming out of the eyepiece To calculate exit pupil divide the focal length of your eyepiece by your telescope s focal ratio For example if you use a 20mm eyepiece with an f 5 telescope the exit pupil would be 4mm EYE RELIEF Eye relief is all about a comfortable viewing experience because it is the distance at wh...

Страница 25: ...tient imaging Designed for refracting telescopes Explore Scientific s Field Flattener can tackle the edge of field aberrations caused by this necessary curvature to ensure your long night at the eyepiece will not be in vain This accessory offers fully multi coated optics and slides securely into the 2 eyepiece holder FOCAL REDUCER Explore Scientific s 3 Field Flattener 7x Focal Reducer is a multi ...

Страница 26: ...th an illuminated reticle that features northern and southern polar reference markings for quick and precise polar alignments with any equatorial mount Although it has a larger 7 field of view it shares the same attention to design and features of the Illuminated Straight Finder Scope These include adjustable brightness for the reticle s deep red illumination precision focus of both the main objec...

Страница 27: ...ess on the Moon or a bright star and make adjustments as necessary MOUNTING YOUR FINDER SCOPE The first step in mounting your finder scope to your telescope is to slide it into the finder scope bracket which has two rings to hold your finder scope in place Each of these rings has three adjusting screws If your finder scope is not already installed in the bracket loosen each of the adjusting screws...

Страница 28: ... but we recommend that you use it at the dimmest setting that will still allow you to comfortably see the red illuminated crosshairs or polar reference markings depending on which model you are using CHANGING BATTERIES ON YOUR ILLUMINATOR The batteries that power your finder scope s illuminator should last for several hours of continuous illumination but we do recommend turning the illuminator off...

Страница 29: ...ew can be gently tightened to keep the focuser stationary once you have reached your desired focus The tension screw s are used to put pressure on the drawtube to secure it and keep it from sliding when heavier accessories like cameras or large eyepieces are added Tension Collar At the end of each focuser you will find a tension collar with three set screws that are used to hold a diagonal or an e...

Страница 30: ...ew is on the bottom This focuser is also rotatable meaning that it can be easily repositioned to change the position of the dials or to meet your specific comfort or viewing needs To use this feature slightly loosen the three tension screws on the visual back adapter on your telescope tube that press down on the focuser Rotate the focuser and gently retighten the screws INSTALLING YOUR FOCUSER The...

Страница 31: ...ler screws retighten the larger locking screws EXTENSION TUBES Some observing situations and accessories require more back focus than your focuser alone may be able to provide Extension tubes aid in fixing this problem by extending the length of the drawtube To install extension tubes unthread the tension collar at the end of the focuser thread the extension tube right onto the focuser tube and th...

Страница 32: ...d to encourage and celebrate public outreach efforts by astronomers of all levels This non profit organization has tasked itself with forging connections between individual astronomers astronomy clubs and larger astronomy and space education initiatives No matter where you are at in your journey to provide outreach AOn is a great resource that can be accessed at www astronomyoutreach net or throug...

Страница 33: ...33 NOTES ...

Страница 34: ... 2016 Explore Scientific LLC All model names and logos are registered trademarks www explorescientificusa com ...

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