why won't my telescope stay still!! help

[traceh]

Hi, I have a skyliner 200p on a dob mount< I know they are not the best mount for imaging, but when I attach my camera to it it just won't stay still, I know there is always going to be movement on them, but mine moves at a silly speed, is there a way I can counterbalance this scope to stop it moving quite so much.

thank you if you can help me it's just so frustrating!!

[dweller25]

You need a tracking mount

[dweller25]

Like this

[ronin]

Simple answer is you do not go imaging with a dobsonian.

If you want to image get the right scope and mount.

A dobsonian is a visual system, a reasonable description is that it is a specialised visual only system.

Yes, someone will come along and put up an image they managed, but someone with a system meant to image will put up 100 images all of which will be better. So "I got this once" doesn't count.

I sometimes want to suggest that SGL has a default banner of "You do not image with a dobsonian". :eek:

[Bizibilder]

Traceh - you do not say what sort of camera you are trying to use or the target that you are trying to image.  Dobsonians, whilst not ideal, can be used for imaging - especially for Solar system objects using a webcam/planetary camera.  Is that what you are trying to do?

[GuillermoBarrancos]

Hi, I have a skyliner 200p on a dob mount< I know they are not the best mount for imaging, but when I attach my camera to it it just won't stay still, I know there is always going to be movement on them, but mine moves at a silly speed, is there a way I can counterbalance this scope to stop it moving quite so much.

thank you if you can help me it's just so frustrating!!

First it would be handy to tell if you have the GoTo version or manual version.

[traceh]

Hi, thanks for your replies guys, I am using the IMG132E camera, I am trying to image the planets to start with, I was getting lovely images of the moon last night but the scope just kept moving too much to do anything with them, I must just have to get a tracking mount, hopefully not going to be too expensive

[Bizibilder]

You could get away with an EQ5 sized mount, with motor drive but an HEQ5 would be far better, even for planetary work.  For any kind of astrophotography it is the mount that is almost more important than the scope!.  I use a 120mm refractor on an EQ5 for Solar imaging in the winter months (when the Sun is too low to be seen from my observatory) and that is fine.  I would strongly recommend the HEQ 5 size as a minimum - you would only need the SynTrek version.  This would also make your set-up somewhat future proof.  Whatever you get, to connect your scope to the mount, you would also need a pair of tube rings and a dovetail bar.

By the way the "speed" at which the object flies across your field of view is not your scope moving but the Earth revolving  !!

[happy-kat]

When you say moving in what way?

Is the ota not holding position or is it when you nudge the base it does not stop turning?

[traceh]

I have looked at the HEQ5 mount, that is something i shall get in time lol it definitely seems worth getting, thank you very much for help everyone and especially Bizibilder

I think its the weight of the camera that is affecting the scope putting it out of balance, because you dont even have to nudge it jsut moves more than normal

[Stevp]

So when you don't have the weight of the camera on, does it "behave" for visual use?

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[happy-kat]

I had to move the position of my ota on the dob base dove bar when I have a camera attached as it throws the neutral balance out if I do not.

[traceh]

Sorry this may sound daft but what is the ota :-)

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[happy-kat]

optical tube assembly, the scope

though I don';t know if your tube can be moved position on your base

[traceh]

Of course it is lol my mind just went totally blank, no mine can't be moved position

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[jarlaxle2k5]

Simple answer is you do not go imaging with a dobsonian.

If you want to image get the right scope and mount.

A dobsonian is a visual system, a reasonable description is that it is a specialised visual only system.

Yes, someone will come along and put up an image they managed, but someone with a system meant to image will put up 100 images all of which will be better. So "I got this once" doesn't count.

I sometimes want to suggest that SGL has a default banner of "You do not image with a dobsonian". :eek:

well i do with pleased result

have a look to my gallery in my signature

[Astrosurf]

Have a look here. I hope it helps, when you've got your balance sorted out!

http://www.iceinspace.com.au/63-201-0-0-1-0.html

As has been said, it's best to use a modified webcam to image planets and the Moon. They take many frames per second so you can catch quite a number before the object moves out of view. Then the video (AVI) that's produced can be stacked in stacking software like Registax. The cam will also be a lot lighter than your camera. Webcams can be bought very cheaply (to start with, as you're a beginner - just to try it out) and there are tutorials on the Web on how to mod them. Like this:

http://stargazerslounge.com/topic/131246-xbox-livecam-mod-cliff/

Alexxx

[traceh]

Thank you I will look on the links :-)

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