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NPZ TAL-150K Instruction Manual

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See also: Service Manual
TAL TELESCOPES
InSTruCTIOn mAnuAL
TAL-50K
TAL-200K
TAL-250K


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Summary of Contents for NPZ TAL-150K

  • Page 1 TAL TELESCOPES TAL-50K TAL-200K TAL-250K InSTruCTIOn mAnuAL...
  • Page 2 Novosibirsk Instrument-making plant, FSUE PA D. Kovalchuk 79/2 novosibirsk, 630049 ruSSIAn FEDErATIOn Fax +7 3832 26594 prinsib@sol.ru; www.npzoptics.com...

  • Page 3: Table Of Contents

    TABLE OF COnTEnTS Page General instructions......4 Technical specifications ...... 5 Inventory list ........6 Construction of the telescope .... . . 8 Preparing telescope for observations ... . . . .  2 Assembling the telescope ...... . .  2 Balancing the telescope ......  3 Aligning the finder scope ...... 1 4 Power supply and hand controller ..... 1 5 Polar alignment ........7 Calibrating the setting circles ..... . .

  • Page 4: General Instructions

    GENErAl INStrUCtIONS Warning! Never observe the Sun directly through your telescope or its finder scope - permanent eye damage could result. Do not let children hold observations through telescope without adult’s control. The telescope is designed for visual observations of celestial ...

  • Page 5: Technical Specifications

    SPECIFICAtIONS tAl-150K tAl-200K tAl-250K Specification Aperture, mm Focal length, mm 550 700 230 Focal ratio 1:10.3 1:8.5 1:8.5 62;24; 68; 36; 85; 70; Telescope magnification, x 55;30 70; 340 23; 426 0.8’’ 0.6’’ 0.5’’ resolving power 2.8 3.4 4.0 limiting visual magnitude Finderscope magnification, x...

  • Page 6: Inventory List

    INVENtOry lISt Component tAl-150K tAl-200K tAl-250K telescope Finderscope: Polar axis finderscope 6 Equatorial mount: MT-3S with counterweights: 3.0 kg ( unit) 3.0 kg (2 units) 4.5 kg ( unit) Pier with legs: C75 (800 mm) C0 (770 mm) Power supply Hand controller Power cord (10 m) Spare parts and accessories: Plossl eyepiece f’=10mm Plossl eyepiece f’=25mm 2x Barlow lens reticle Plug for photographing T-adapter M42x0.75...
  • Page 7 Component Super wide angle eyepieces (1.25’’): f’=10mm (60°) f’=15mm (65°) f’=20mm (65°) Ultra wide angle eyepieces (80°): f’=15mm (1.25’’) f’=20mm (2’’) f’=24mm (2’’) f’=25mm (2’’) 3x Barlow lens Guide eyepieces 12.5mm (1.25’’) Off-axis guider (2’’) Color filters M28.5x0.6: black neutral yellow blue green Color filters M48x0.75: black neutral yellow blue green Plug .25’’ Plug 2’’ Power cord extension - cable with car adapter (10m)

  • Page 8: Construction Of The Telescope

    CONStrUCtION OF tHE tElESCOPE The telescope consists of three  main parts: optical tube assembly (OTA) (1), german equatorial mount (2), a pier or tripod (3). the optical tube is a basic component of the telescope. It includes all main optical units such as a primary mirror, a corrector and an eyepiece unit with focusing mechanism. A Catadioptric Telescope (Klevtsov  System): beams of rays, reflected from the primary mirror (1), pass through the corrector lenses (2) and (3) and having reflected from the smooth surface of the lens (3), go back through corrector, forming the object’s image at the focal plane of the eyepiece (4). For comfort observations of celestial objects close to zenith, eyepiece unit is inclined on 90° relatively to the optical axis of the telescope with...
  • Page 9 Focuser consists of rack and  pinion. The pinion axis has focus knobs, which help move the eyepiece tube in order to focus telescope. To provide the smoothness  of TAL-150K and TAL-200K telescopes focusers, hold the left focus knob (1) with one hand and turn the right focus knob (2) clockwise (with a little effort) with other hand. Fix the position of the focuser, ...
  • Page 10 the equatorial mount is designed for pointing the telescope at the celestial objects and tracking their movement. MT-3S (MT-3S-2D) mount consists of two axes square with each other: the polar axis and the axis of declination. There is a mounting plate with OTA rings on the top point of the declination axis, and a counter-weight shaft with counter-weights on the other side. It is possible to place all types of the mounts on a pier or tripod. The mount head has a clock drive embedded, which enables tracking of celestial objects with user defined speed.
  • Page 11 the pier serves for holding an equatorial mount with an OTA. It consists of the tube and three attachable legs. the tripod can be better used on a rugged terrain. For comfort observing it is equipped with an accessory shelf (1).

  • Page 12: Preparing Telescope For Observations

    PrEPArING tElESCOPE FOr ObSErVAtIONS ASSEMblING tHE tElESCOPE Take a pier (1) and legs (2) out of  the package. Attach tightly three legs to the bottom point of the pier using the captive screws. The pier must not swing on the legs. Place the pier on a firm plain  surface. The pin should be orien- ted to the North. Take the equatorial mount and  place it on the top of the pier. Check the pin (3) to be on the pier lines up with the azimuth adjustment knobs (2).

  • Page 13: Balancing The Telescope

    Take the OTA accurately from the  packing, place it on the mounting plate (1) and fix the OTA by captive screws (2). Certain of the security of attachment.  Place the finderscope bracket (1) in  the wedge slides for (TAL-200K and TAL-250K telescopes). TAL-50K telescope has finderscope bracket mounted directly on the OTA. Fix the finderscope with six thumbscrews (2). bAlANCING tHE tElESCOPE To provide a smooth motion of the telescope and reliable operation of equatorial mount drives, the balancing of the telescopes is required. Place the polar axis in the horizontal  position (0° on the latitude dial), using the width adjustment mechanism () with the loosen slow-motion control (2).

  • Page 14: Aligning The Finder Scope

    Now with Dec. lock released,  loosen the tube ring lock clamps and slide the OTA forward or back in the tube rings until balanced. Fix the tube and the Dec.axis.  repeat balancing each time when  placing additional accessories on the telescopic tube, such as photo and video cameras, eyepieces, guides and other devices, which enlarge the weight of the OTA. Keep in mind that if the telescope is not balanced properly, the clock drive periodic error will increase.

  • Page 15: Power Supply And Hand Controller

    Now, looking through the finder  scope and using the six alignment thumbscrews, center the object on the intersection of the crosshairs of the finder scope. In future, check the coalignment of the telescope and the finder scope prior to obser- vations. POWEr SUPPly AND HAND CONtrOllEr Warning! Always connect power supply to the mount using the power cord with power supply disconnected from the power outlet. Use only original manufacturer’s power supply fuse or analogue (consult your dealer).
  • Page 16 Press one of the speed buttons (1)  to start the clock drive. The LED light on the hand controller should turn on (2). Push the same button again to stop the clock drive. Press one of the two speed  correction buttons (3) while clock drive is working, if necessary. The LED light on the hand controller should blink (2) while button is pressed down. For mount mT-3S-2D launch the ...

  • Page 17: Polar Alignment

    POlAr AlIGNMENt Due to the Earth’s rotation, celestial objects move in the telescope field of view (the higher telescope magnification - the faster those movements appear). Polar alignment of the telescope allows more comfortable observations, because you can follow objects by moving the telescope about one axis, the polar axis (or right Ascension (r.A.) axis), which is in parallel with the Earth’s axis. Release the latitude lock (1). Using  latitude adjustment knob (2), move R.A. axis up or down in order to set the latitude of your location (see latitude dial). Re-tighten the latitude lock (1).  For visual observations point the  R.A. (polar) axis of the telescope Polaris towards Polaris ( umi). See the  picture. With this level of pointing accuracy,  very little use of the Dec. slow- motion control is necessary for ursa major...

  • Page 18: Calibrating The Setting Circles

    Match stars depicted on the reticle  with the celestial objects in the sky, using azimuth (2) and latitude (3) adjustment knobs and rotating the polar axis finder scope around its axis. CAlIbrAtING tHE SEttING CIrClES R.A. and Dec. axes have setting circles, which enable observer to locate an object in the sky by its celestial coordinates – right ascension (R.A.) and Declination (Dec.). Calibration of setting circles is done after polar alignment of the telescope. Level the Dec. axis (put it in the ...

  • Page 19: Observations

    ObSErVAtIONS When using higher magnification not only the visible image size appears larger in the telescope, but also blurring and distortion of the image, star twinkle, caused by atmosphere become more significant. To achieve maximum stability of the visible image and best performance of the telescope, all parts of the telescope need to reach thermal equilibrium with the ambient air.
  • Page 20 Plossl f’=10 mm Plossl f’=25 mm х х tAl-200K Plossl f’=10 mm Plossl f’=25 mm х х tAl-250K Plossl f’=25 mm Plossl f’=10 mm х х For higher magnification, use Barlow  lens with one of the eyepieces (see picture). 2 Barlow lens doubles magnification of the telescope. tAl-150K Plossl f’=25 mm, Plossl f’=10 mm, Barlow lens Barlow lens х х tAl-200K Plossl f’=25 mm, Plossl f’=10 mm, Barlow lens Barlow lens х х tAl-250K Plossl f’=25 mm, Plossl f’=10 mm,...

  • Page 21: Astrophotography

    AStrOPHOtOGrAPHy Astrophotography is executed with compact reflex camera with objective thread M42x1 (M42x0.75 thread camera adapter is also supplied with the telescope). To mount the camera on the  tAl-150K telescope, take the diagonal mirror away and unscrew the camera objective. For telescope TAL-50K screw  the bushing for taking pictures in the camera.

  • Page 22: Maintenance

    MAINtENANCE In order to keep telescope in good operating condition one should provide good care and maintenance for the instrument. Please note that lens or mirror surfaces should be cleaned as infrequently as possible, only when absolutely necessary. Optics self-cleaning only permitted after expiration of manufac- turer limited warranty! Keep telescope clean and protect it  from any physical damage. Use a clean, soft cloth to remove  dust from all metallic surfaces. Then wipe them with a cloth wetted in acid-free vaseline and dry with a napkin. To clean the primary mirror remove ...
  • Page 23 Set the primary mirror main unit  back into the tube in reverse sequence. Corrector disjointing is not reco-  mmended. Use only quality optical lens  cleaning tissue and optical lens cleaning fluid specifically designed for multicoated optics to clean your eyepieces and finderscope. Keep the dust cover on the front of  the telescope and the end cap on the focuser tube when not in use.

  • Page 24: Collimation (Alignment) Of The Optics

    COllIMAtION (AlIGNMENt) OF tHE OPtICS Collimation (alignment) of the optics is permitted only in case of absolute necessity, and after expiration of manufacturer limited warranty. In case of accidental mirrors misalignment or after cleaning optical parts, telescope collimation might be necessary. Set the eyepiece f’=10mm with the  Barlow lens into the tube. Watch attentively the reflection  and note the rotation direction for achieving diffraction star image.
  • Page 25 Star diffraction image should have round kernel and not more than 2 round rings. Breaks and kernel form change are not allowed. Effectiveness reduction within first diffraction ring is allowed only. The diffraction image is achieved,  tighten all 6 screws, while observing and correcting the diffraction image if needed. Set the ring back.  If the weather does not allow  getting the clear diffraction image of the star, make the adjustment orienting on slightly out-of-focus image, but the energy should be spread equally around the...

  • Page 26: Storage

    StOrAGE The telescope must be kept in a clean, dry (humidity must not  exceed 80%), dust-free place with an ambient temperature between +5° and +40°C. Avoid collision and shaking of the telescope.  It is prohibited to store acids, alkalis, and any chemically active  substances, which may produce evolved gas or vapor harmful for the optics, at the same place with the telescope.

  • Page 27: Acceptance Certificate

    ACCEPtANCE CErtIFICAtE Telescope ____________ , serial # ___________ Equatorial mount, serial # _____________ Passed the product approval and found serviceable. Manufacturing date __________________ Signatures _____________________...

  • Page 28: In The Northern Hemisphere

    Appendix A brightest stars visible in the Northern Hemisphere R. A. Declination Visible Constellation Star 2000.0 2000.0 magnitude о Andromeda 2.07  And Alpheratz о Andromeda 2.07  And mirach о ursa minor .97 Polaris  umi о Perseus .79 Mirfak  Per о...

This manual is also suitable for:

Tal-250kTal-200k

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