| As
the standard altazimut platform isn't very well suited for photography
(by quickly introducing field rotation), I started thinking about buying
an equatorial one. Prices of the Meade eqatorial wedge as well as most
commercial alteratives being rather high, I constructed my own version
that despite being entirely made of wood seems to be rather sturdy. Mounted
on four wheels, it could be rolled out of my garage onto an observing
platform in the garden. |
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| Although
this cut the setup time in two, I still wanted a quicker solution, sidestepping
finetuning of the polar orientation and mounting of cameras and all the
other stuff. A permanent observatory seemed the only solution. Because
of budget limitations, it had to be a roll-off roof DIY construction,
the base being laid around the existing observing platform. |
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| Fitting
rather tightly around the telescope, it is a box about 2mx2mx1,7m with
the roof adding at most 0,25m to the height. For more comfortable observing,
a separate 2mx1m 'control room' was added. It houses some accessories
and a desk for the computer (connecting to the control and data cables).
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| A
sliding door gives acces to this room, a plastic window allowing visual
contact with the telescope. The roof rolls off on six wheels along (for
the moment) wooden rails and is laterally retained by four small wheels
pushing against two wooden planks. |
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| With
the telescope now permanently mounted, I unearthed my 35 year old 6cm
refractor, fitted it to the Meade by means of some plumbers hardware,
and got me a Meade DSI to be used as an autoguider. For imaging planetary
nebulae at f/10, the 900mm focal lenght is somewhat short of ideal and
exposure times are still limited. For deep sky photography of more extended
objects at approximately f/6, it seems to perform sufficiently well (although
finding a brigh enough guide star isn't always easy). |
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