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Cable drag


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With cables running from my power tank to my scope and camera, I try to keep them from entangling with each other and the tripod legs. But to what extent I wonder, does cable drag have on the tracking?

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With cables running from my power tank to my scope and camera, I try to keep them from entangling with each other and the tripod legs. But to what extent I wonder, does cable drag have on the tracking?

A great deal depending on your mount, I have an EQ5 pro, once polar aligned and fine tuned I have managed to guide very well for 1200s subs over 3hours of imaging session but with the weight of the scope, the guide scope and guide camera , the imaging camera, reducer etc it is almost up to the limit of mount. I have noticed that the slightest movement of the wires will cause a spike in the PHD graph. Heavier more sturdy mounts will be less suceptible to such slight movements.

Regards,

A.G

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The way to mitigate it is to contrive a way of hanging most of the weight of the cables near the centre of the RA and Dec axes of the mount. There they don't have a 'moment' or leverage effect.

I like using elastic to attach them as well. It 'gives' and provides shock absorption.

Olly

http://ollypenrice.smugmug.com/Other/Best-of-Les-Granges/22435624_WLMPTM#!i=2277139556&k=FGgG233

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I control my eos via EOS remote controller, focuser via another controller etc... I've got most of those things resting on the mount's head attached with velcro. Mounts HC + all other things...Still, some cables are ofcourse still draging behind, but as Olly said, try to keep the "drag point" near the RA/DEC center.

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