7 Mar 2013

14" Newtonian

This was about a year long project from first orders to first light!

So here's my "home build" 14" Newtonian inside the observatory. There's not too much extra room but it fits in perfectly.

This is combination of parts from several manufacturer's and a home made carbon fiber tube.

Here's some specifications:
Primary mirror:                  Oldham Optical, 14" (355mm) with PV 1/10λ and strehl 0.97
Secondary mirror:              Oldham Optical, 4.7" (120mm) 
Focal ratio:                        f/4.8 (focal length 1700mm)
Primary mirror cell:            Orion Optics U.K
Secondary spider:               Protostar, 4-vane heavy-duty with anti-dew heater
Focuser:                            Orion Optics U.K, 3" Crayford with 10:1 reduction (+RoboFocus)
Field corrector:                  Orion Optics U.K, 3" CFF (corrected field flattener)
Tube inside diameter:         400mm
Tube length:                       about 1600mm
Weight:                             about 30kg (without camera)

And here's a detailed picture of the camera. As you can see I didn't pay too much of attention for finalizing the tube. And I needed to add a steel plate (~3kg) under the Robofocus to balance it better (to fit it inside the observatory). The adhesive tape is used only for blocking the possible scattered light. Sbig RGH (remote guide head) is used for guiding.

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