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Summary of Contents for Takahashi Mewlon-180C
- Page 1 Instruction Manual TAKAHASHI...
- Page 2 Thank you very much for your purchase of the Takahashi Mewlon- 180C telescope. This model is the lightest and most compact one in all Mewlon series with 50.8(2") system provided. The mirrors are coated with a HR multi-layer coating. In order to use the telescope to its highest possible capabilities, please read this instruction manual very carefully and familiarize yourself with all of the functions that your telescope offers.
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Page 3: Precautions For Safe Operation
Precautions for Safe Operation WARNING If a telescope is pointed at the sun, its DANGER light and heat concentrated at the focal point will be intense and dangerous. NEVER LOOK THE SUN DIRECTLY. VIEWING THE SUN WITHOUT PROPER FILTERS MAY RESULT IN BLINDNESS. CAUTION ◆ When attaching the tube assembly onto the equatorial mount, be careful not to pinch your fingers or to drop the tube... -
Page 4: Table Of Contents
Contents Precautions for Safe Operation ----------------------- 3 Contents ----------------------------------------------------- 4 Specifications ---------------------------------------------- 5 Tube Assembly Layout ---------------------------------- 6 Features ----------------------------------------------------- 7 Setup Procedures ----------------------------------------- 8 Focusing ----------------------------------------------------- 11 Finder Adjustment ---------------------------------------- 12 Observation ------------------------------------------------ 14 Accessories ------------------------------------------------ 15 Collimation -------------------------------------------------- 18 Care &... -
Page 5: Specifications
Specifications Optical System -------------------- Dall Kirkham Effective Aperture ----------------- 180mm HR Multi-Coated Effective Focal Length ----------- 2160mm Effective Focal Ratio ------------- 1:12.0 Secondary Mirror ------------------ 54mm HR Multi-Coated Resolving Power ------------------ 0.64" Limiting Magnitude --------------- 13.0 Light Gathering Power ----------- 661x When used with Mewlon Flattener/Reducer Effective Focal Length --------- 1760 Effective Focal Ratio ------------ 1:9.8... -
Page 6: Tube Assembly Layout
Tube Assembly Layout Main Tube Dove-Tail Adapter (M) 6x30 Finder Scope Coupling (S) 50.8(2”) Sleeve 31.7(1¼”) Eyepiece Adapter Eyepiece Adapter Cap - 6 -... -
Page 7: Features
7% as spherical aberration is corrected by this compared to the original Mewlon-180. design approach using both mirrors for The Mewlon-180C tube is an open tube correction. telescope. Since there is no corrector plate There is only trace spherical aberration in... -
Page 8: Setup Procedures
Setup Procedures ◆ Attaching the Tube Assembly onto the Mount Attach the dove-tail adapter (F) firmly on the The finder scope is built-in the tube mount with two cap bolts as shown. assembly and is designed as the carrying handle. When setting the tube assembly on the mount, carry it with two hands as illustrated below. - Page 9 ◆ Balancing After the tube assembly has been attached on the mount, the next step is to balance it in the R.A. and Dec. axes. If unbalanced, the clamps will not work effectively and the tube assembly will abruptly and dangerously turn. When the motor of the mount is rotating, unbalancing will cause gearing trouble that will make the life of the mount shorter.
- Page 10 Then, tighten the compression ring to lock the Eyepiece eyepiece. ◆ Eyepieces A wide variation of eyepieces are available from Takahashi. Plastic Ring ▼LE Series ▼Erfle Standard type, wide view field and high With 3-group 5-element optics, offering 60 magnification.
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Page 11: Focusing
Focusing this optical system is done by moving the primary mirror forward and Caution backward using the focusing knob. The The optical axis of the Mewlon-180C relation of the motion direction of the could become decollimated if the primary mirror and the focal point is as Mewlon is subjected to strong shocks illustrated below. -
Page 12: Finder Adjustment
Finder Adjustment The field of view of a telescope can be highly magnified and narrow so that it is difficult to place an object in the field of view. In order to help you to find the object easily in the view field of your telescope, a 6x30 finder scope with wide field is provided with your telescope. - Page 13 3. If the object is not centered in the field of view of both telescopes, adjust the Hex Wrench finder using the following method so that the object is placed at the center of the crosshair. Loosen 4. Loosen the lock ring as illustrated. 5.
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Page 14: Observation
When Mewlon-180C is lower the magnification. It is a general rule used as a telephoto lens with a camera, its... -
Page 15: Accessories
Accessories Here are major accessories conveniently usable with the Mewlon-180C. ◆ Diagonal Mirror 50.8mm (2") & Diagonal Prism 31.7mm (1¼”) When either of these diagonals are used with an eyepiece, the light path is longer to set the secondary closer to the primary. In order to obtain sharp focus, use these diagonals as indicated in the system chart. - Page 16 ◆ TCA-4 This is a highly functional variable eyepiece projection adapter that can change quickly from visual observation to high magnification imaging. The magnifying eyepiece can be changed quickly. In addition, the magnification ratio can be changed at will by sliding the magnifying tube.
- Page 17 ◆ Mewlon Flattener/Reducer Due to relatively large coma, the Mewlon-180C is not suited for deep sky imaging at prime focus. However, you can enjoy deep sky imaging using the Mewlon f/9.8 Flattener/Reducer, which decreases the focal ratio to f/9.8 and reduces coma.
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Page 18: Collimation
Collimation Collimating the optical axis of the Mewlon-180C is made possible by adjusting the tilt the secondary mirror. Therefore, you will have no such troublesome works as in the Newtonian telescope. The secondary mirror is an expanding optical system so that it is so sensitive to the collimation that a slight movement of the adjusting screw can make the optical axis out of order, resulting in the images degraded greatly. - Page 19 3. In order collimate the optical axis, adjust View Field three correcting screws with the 2.5mm Hex wrench provided. If the axis is out of alignment as shown in the illustration at the right, tighten the screw at the right side, as seen from the tube opening.
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Page 20: Care & Maintenance
Care & Maintenance The primary mirror of the Mewlon-180C is exposed directly to the open air. If the surface of the mirror is left covered with dust and dew, it will become dim and reduce the contrast of images. Using the following procedures, clean up dust from the surface of the mirror using a hand blower at the regular intervals. -
Page 21: System Charts
System Charts ◆ Visual/Imaging System Chart ▼Standard Accessories 13. TKP00113 50.8/2” Sleeve 14. TKP00103 Coupling (S) 46. TKP00101 31.7(1¼”) Eyepiece Adapter ▼Optional Accessories 18. TKA70581 Mewlon Flatener/Reducer 27. TKA00404 4-Turret Eyepiece Holder 31.7D 30. TKA00206 Prime Focus Ring (M43 → M42) 32. - Page 22 MEMO Version 1.00 - 22 -...
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- Page 24 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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