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Takahashi E-160ED, Instruction Manual

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Takahashi E-160ED Instruction Manual Download Page 2

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Thank you for purchasing the ε-160ED hyperbolic astrograph. 

While on paper the specifications of the ε-160ED look very similar 

to the older ε-160, the optical performance is completely different. 

Through improved design and exciting manufacturing precision, 

the correction of aberrations has allowed Takahashi to achieve 

a diffraction limited spot size of 3 microns over a 44mm image 

circle. This helps make the ε-160ED the ultimate telescope for 

astrophotography.

Please read this instruction manual thoroughly prior to use. This 

will help you get the most out of your telescope. All products are 

shipped only after a thorough inspection, but if you find any defects, 

please notify your Takahashi distributor immediately.

Summary of Contents for E-160ED

Page 1: ...Instruction Manual TAKAHASHI ...

Page 2: ... the correction of aberrations has allowed Takahashi to achieve a diffraction limited spot size of 3 microns over a 44mm image circle This helps make the ε 160ED the ultimate telescope for astrophotography Please read this instruction manual thoroughly prior to use This will help you get the most out of your telescope All products are shipped only after a thorough inspection but if you find any de...

Page 3: ...lescope on an unstable surface The telescope could fall resulting in damage to the telescope or bodily injury Do not place the product in direct sunlight Accidentally pointing ی ی the telescope at the sun can result in intense heat at the focal point and possible fire Be careful not to pinch fingers when using the focuser ی ی The telescope contains small parts that can be harmful if ی ی swallowed ...

Page 4: ...ing Caution 3 Table of Contents 4 Specifications 5 Tube Assembly Layout 6 About the Optical System 7 Setup 8 Observation 15 Accessories 17 Optical Alignment 18 Precautions for Photography 26 Care Maintenance 27 System Charts 29 ...

Page 5: ... elements in 2 groups Image Circle φ44mm Photographic Field 4 8 degrees Metal Back 56 2mm Diameter of Main Tube 204mm Length of Main Tube Assembly 580mm Weight of Main Tube Assembly approximately 6 9kg Finder Scope optional accessory Focusing System Rack Pinion MEF 3 compatible Included Instruction Manual Warranty Card 3 Screws for primary mirror Installation Hex Wrench 2mm 2 5mm 3mm 4mm ...

Page 6: ...etainer x 3 Primary Mirror Optical Axis Adjustment Screw x 3 Oblique Mirror Spider Cross Head Screw x 3 Rotator Lock Primary Mirror Cell Adjustment Screw Focus Lock Focuser Draw Tube ε 160ED Corrector ε 130D Visual Adapter Coupling S 31 7 mm Eyepiece Adapter Adapter Cap Focuser Knob Main Tube Finder Base Focuser Base Top Ring Cap Primary Mirror Primary Mirror Cell ...

Page 7: ... star image is about 1 10 the size of the older ε 160 In addition the distortion aberration distortion which was a drawback of the old correction lens has been corrected to less than half which makes image mosaics easier to compose The ε 160ED s 530mm f 3 3 specification which has the highest level of optical performance combined with the lightweight and compact body make it an astrophotography in...

Page 8: ...lts completely This will provide some play in the position of the tube rings Then attach the bridge plate to the tube rings connecting the two tube rings on the top After the bridge plate is attached tighten the tube ring mounting bolts to the mounting plate Secure the mounting plate to the Takahashi mount using the two provide cap bolts With the tube rings open carefully mount the telescope in th...

Page 9: ...o make adjustments with the corrector in place so the corrector should be removed to adjust the optical axis When reattaching the corrector after adjusting the optical axis be sure that it is screwed completely in so it does not come loose during imaging Note The corrector for the ε 160ED is for the ε 160ED only It cannot be used with other models such as the older model ε 160 because the aspheric...

Page 10: ...r your needs LE LE eyepieces are high quality eyepieces that provide a wide field of view and a wide variety of types from low to high magnification Available sizes LE5 to LE30 in a 31 7 mm style and LE40 and LE50 in 50 8 mm style Note that 50 8 mm eyepieces cannot be used with the ε 160ED ABBE While the construction of Abbe eyepieces has a short apparent eye relief when compared to more modern de...

Page 11: ... the eyepiece to the eyepiece adapter and check that the focus lock is loose Next slowly turn the focus knob The telescope is shipped with the drawtube in its fully retracted position so when using the telescope for the first time you will gradually need to extend the draw tube to achieve focus Prior to observing celestial bodies focus on a distant terrestrial object during the daytime note that t...

Page 12: ...cumference of the Finder bracket and the Finder scope itself is even and fix with the Lock nuts Hex Wrench 4mm Washer Finder Bracket Hex Cap Bolt Groove 6x30 Finder Scope Finder scope centering screw Lock Nut Finder Bracket Finder Base Attaching the Finder Scope requires a flathead screwdriver If the Finder scope adjustment screws and the end of the Finder scope centering screws are too far inside...

Page 13: ... achieved Tighten the focus lock ring 333 Crosshair Telescope Field of View Finder Field of View a b c Adjusting the Finder Alignment Set up the telescope for visual use 111 according to the system chart and attach a lower power eyepiece Then select a clearly visible distant object and center it in the field of view This is most easily done during the daytime Exchange the lower power eyepiece for ...

Page 14: ...e Wipe the terminal surface of the new battery thoroughly and install the battery Use care not to make a mistake in the polarity The battery uses a button battery LR44 7 x 50 Finder scope Insert the 7x50 Finder scope into the Finder bracket as shown in the figure below Evenly tighten the 3 Finder centering screws at appropriate positions with a flathead screwdriver Adjust the finder screws so that...

Page 15: ...ng the view Astro Imaging ی ی The ε 160ED is designed as an astrophoto graphy telescope for deep space imaging Prime Focus Imaging When imaging with a telescope focusing is one of the most critical elements of making great images To achieve proper focus it is important to place the camera sensor at the focal point of the telescope Because the focal length of the telescope is large it is also impor...

Page 16: ...n the drawtube Back focus This ε 160ED has a back focus measured from the correction lens to the focal plane When specifying a camera system it is important that the camera sensor be located at the focal point as defined by the back focus If this is not observed the optical performance as designed cannot be achieved When using accessories connect according to the system chart or follow the dimensi...

Page 17: ...be needed to convert the mirrorless camara to either and EF or F mount Contact your Takahashi distributor for details on other cameras MEF 3 ی ی The optional MEF 3 Micro Edge Focuser is an accessory sold separately exclusively for Takahashi It is designed to move the focuser at a fine speed of 8 to 1 ratio smaller knob while the larger knob moves the focuser at 1 to 1 ratio It can be easily attach...

Page 18: ...ng accessories and tools Accessories Visual adapter ε 130D Eyepiece adapter Connection ring short 31 7 Eyepiece adapter Sold Separately Collimating tube Centering eyepiece 31 7 Tools Hex wrench Flathead screwdriver Spanner 14mm Visual Adapter ε 130D Remove Corrector Collimating Tube sold separately Coupling S 31 7 mm Eyepiece Adapter Collimating Eyepiece Optical Alignment Connection ی ی First remo...

Page 19: ...e will be a great help in collimating the ε 160ED and are used in the instructions below When collimation is necessary complete the process during the day in a brightly lit room The telescope can be pointed at a brightly lit white wall or at a translucent white sheet placed across a window Place the tube with the focuser to the left facing the light source as illustrated in the figure If you lose ...

Page 20: ... a parallel fashion for better collimation Tilting the secondary mirror 333 There are three screws with locking nuts provided to allow the secondary mirror to be tilted for collimation In order to tilt the secondary it is necessary to loosen the lock nuts Loosen each slightly to prevent the secondary from moving too much Refer to Fig C 3 Aligning the Secondary Mirror ی ی Turn the crosshair of the ...

Page 21: ...rror mark must be moved upwards Slightly loosen the push screws A B and C after backing off the lock nuts Loosen the large knurled nut and then tighten the push screws A B and C A A B B C C Perpendicular Line Horizontal Line View of the collimating eyepiece Push the screw A B C Push the screw B Loosen the pullnut Sleeve Opening Figure C 7 Figure C 8 Figure C 9 Now the center of the secondary dot h...

Page 22: ...ntered in on the crosshairs by adjusting screw A Turn the secondary holder Center circle of the collimating eyepiece Diagnal mirror center dot Diagnal Mirror Outside edge of collimating eyepiece This side is wider due to the offset of the secondary mirror This figure illustrates the collimation of the correct secondary mirror Note In this illustration the circle on the primary mirror has been left...

Page 23: ...int of the crosshair is turned Figure C 13 Figure C 14 3 primary mirror adjustment screws A B C View when optical axis correction is completed Primary Mirror Mark Collimating Eyepiece Figure C 16 Figure C 15 When the optical axis of the secondary mirror is aligned the primary mirror mark is omitted in this figure but if the eyepiece is rotated the crosshair may shift with respect to the secondary ...

Page 24: ...w from the top edge View from the bottom edge Adjusting the spider ی ی The spider is adjusted at the time of product shipment If you haven t adjusted the spider no further action is required Remove the parts corrector and visual 111 adapters attached to the drawtube and look from the top side of the focuser and then from the bottom side of the focuser You will see black crescents around the second...

Page 25: ... adjustments are complete Star image test ی ی Photo test After adjusting the optical axis with the centering eyepiece the in focus and out of focus airy disks are checked visually but since the ε 160ED is an astro camera it is better to evaluate a test image That way you can detect a deviation of the optical axis from the edge of the image For this test select an image which has the sharpest centr...

Page 26: ...o the telescope be sure to connect the camera according to the system chart If the connection method is not done correctly the image may not be in focus and the expected performance may not be assured A bright star in the field may cause ghosting Dew Shield ی ی Attaching a dew shield to the end of the optical tube assembly will help to prevent both stray light and dew condensation Thick paper can ...

Page 27: ...tly in a spiral from the center of the lens to the periphery Please note that if you wipe it with dust on it or with strong pressure it may cause scratches Optical tube assembly ی ی For cleaning the optical tube assembly use a damp tightly squeezed cloth Dirt that is difficult to remove can be cleaned by wiping it off with car wax PRECAUTIONS Primary mirror and secondary mirror ی ی Dew condensatio...

Page 28: ...ocuser ی ی The drawtube may rattle during long term use If there is play turn the adjustment screws in two places with the hex wrench and adjust so that the drawtube moves smoothly with the least amount of backlash Since it is adjusted to the best position at the factory do not touch this screw more than necessary Special grease is used for the drawtube and rotating body so it can be used for a lo...

Page 29: ...1 Optional Accessories 19 Collimating tube TKA00442 29 31 7 1 Collimating eyepiece TKA00441 33 T Mount DX WR EOS TKA01251 T Mount DX WR Nikon TKA01255 34 Digital SLR Camera Canon Nikon 47 31 7 1 Eyepiece 60 Epsilon Extender 1 5x release date TBD Note Parts Nos 10 14 18 and 46 are standard with the tube assembly Some DSLR can not be attached 10 14 10 33 34 34 33 60 19 18 10 46 29 14 46 47 14 46 47 ...

Page 30: ... 30 MEMO ...

Page 31: ... 31 Version 1 00 MEMO ...

Page 32: ...TAKAHASHI SEISAKUSHO Ltd 41 7 Oharacho Itabashiku Tokyo 174 0061 JAPAN PHONE 81 3 3966 9491 FAX 81 3 3966 9524 ...

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