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Archiv Dobson 20 Zoll

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Cyclop_si

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I am selling 20-inch (50cm) f/4 Dobson telescope. Made by David Lukehurst, optics by Oldham Optics, both UK.

Modular design makes it of convenient size for transport when disassembled. It is built in such a way, that set-up is easily done by single person, since its heaviest part (mirror box + mirror cell + mirror itself, which is 40mm thick) weights just slightly above 30 kg. Assembly and disassembly are done without any tools. Moonlite Ball & Socket lower truss connectors are used. Together with cloth shroud and finder scope base (but without finder-scope). Double speed MoonLite 2-inch focuser. 18-point primary mirror cell together with Howie Glatter Cable Sling support. Primary mirror is equipped with cooling fan and secondary mirror is fitted with dew heater.

Primary mirror has some dust and dirt, but nothing serious. Mirror coating condition is good taking into account almost 10 years old mirror. Primary mirror figure is very good with Strehl ratio of 0.98. Secondary mirror has some small signs of astigmatism if careful out of focus testing is done, unnoticeable in focus.

Pick-up in Slovenia (no option of transporting it via carrier service).

Price is 3000 EUR.

PM or david.grgic@gmail.com



Link zur Grafik: http://shrani.si/f/25/rf/L1PeEhC/dl20.jpg

Link zur Grafik: http://shrani.si/f/f/GH/4tLH9qTY/d20dismantled.jpg

Link zur Grafik: http://shrani.si/f/3V/Yh/3rG0TTez/dl20wavefront.jpg

Link zur Grafik: http://shrani.si/f/2e/Zw/1PT60u67/dl201dsc0206.jpg

Link zur Grafik: http://shrani.si/f/9/OY/QVW09q3/dl202dsc0214.jpg

Link zur Grafik: http://shrani.si/f/3y/M4/uVF5Kh2/dl203dsc0217.jpg

Link zur Grafik: http://shrani.si/f/2z/Z8/4pjGlW0p/dl20side3.jpg
 
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