Orion starshoot g3 cannot focus

[PauloEgidio]

Hi!

My name is Paulo and I'm new here.

I have a skywatcher 10' dobsonian (with goto and tracking) and I tried to use my recent origin g3 deep space color starshoot camera.

The manual says that I shold point to a moderately bright star so I choose The Acrux, which is always visible here in Brazil. The star was very visible in the center of the 30mm eyepice. I remove the eyepice and attached the camera.

all I got was an image of the tube's interior...

I tried removing the 1.25 attachment from both camera and telescope and it stays the same. I tried to move the telescope focuser to min and max, - it has changed a little bit but still shows the tube.

I tried to use a barlow - nope.
I tried to defuse the barlow's lens and use the barlow tube as an extender - the image was closer but it still shows the telescope interior...

I tried to grab the camera and hold with my hand in front of the eyepice and it sills shows the inside of the telescope.

Thanks!

Paulo Egidio
Monte Verde - MG
Brazil

[Nikolas (Nik)]

you need to use eyepiece projection as the dob's mirror is set too far back to allow prime focus with a camera.
The other option is to move the mirror forward.
Have a read of this thread:
http://www.iceinspace.com.au/forum/showthread.php?t=144465

[doppler (Rick)]

I have found that with smaller web cam type sensors I need a very long extension tube to get focus on my newt but my DSLR needs to get in closer to get focus.

[raymo]

That's not right Nik, all Skywatcher Newtonian tube assemblies are made to
allow prime focus imaging, unlike many other brands.
Paulo, you need to find out whether you can't get the G3 near enough to the focuser, or far enough away. In your picture there is a black circle in the
centre, if you put your camera up to the focuser and then move it away, does the circle get larger or smaller as the camera moves away?
raymo

[PauloEgidio]

Originally Posted by Nikolas

you need to use eyepiece projection as the dob's mirror is set too far back to allow prime focus with a camera.
The other option is to move the mirror forward.
Have a read of this thread:
http://www.iceinspace.com.au/forum/showthread.php?t=144465

Thanks! I will read it.

Since this is a collapsible dobsonian, I will try to shorter the tube's lenght...

IN fact this is my telescope:
http://www.skywatcher.com/product.php?cat=6&id=65

I will post here as soon as I try it on the weekend.
Thanks!
Paulo

[PauloEgidio]

Originally Posted by raymo

That's not right Nik, all Skywatcher Newtonian tube assemblies are made to
allow prime focus imaging, unlike many other brands.
Paulo, you need to find out whether you can't get the G3 near enough to the focuser, or far enough away. In your picture there is a black circle in the
centre, if you put your camera up to the focuser and then move it away, does the circle get larger or smaller as the camera moves away?
raymo

I THINK the black circle gets bigger as I moved the camera far away.

I will grab some more pictures in the weekend and post here.

Thanks for trying to help!

Best regards,
Paulo

BTW, are you all australians? As far as I know, Australia, New zealand and Brazil are the three countries that have the southern cross in it's flags...

[PauloEgidio]

Originally Posted by doppler

I have found that with smaller web cam type sensors I need a very long extension tube to get focus on my newt but my DSLR needs to get in closer to get focus.

How much longer? Mine was 30 centimeters more or less... I will try to get a picture of this.

BTW is there some kind of support for this camera at orion?

or a FAQ?

Thanks for helping!

Best regards,
Paulo

[Nikolas (Nik)]

Originally Posted by PauloEgidio

I THINK the black circle gets bigger as I moved the camera far away.

I will grab some more pictures in the weekend and post here.

Thanks for trying to help!

Best regards,
Paulo

BTW, are you all australians? As far as I know, Australia, New zealand and Brazil are the three countries that have the southern cross in it's flags...

Yes we are as this is mainly an Australian (and some New zealanders) forum.
You need to try the eyepiece projection as this is what will work for you.

[iborg (Philip)]

Hi Paulo

I think Papua New Guinea and Samoa might disagree with you about the flags!

https://en.wikipedia.org/wiki/Flags_...Southern_Cross

Good luck getting your camera working.

Philip

[PauloEgidio]

Originally Posted by iborg

Hi Paulo

I think Papua New Guinea and Samoa might disagree with you about the flags!

https://en.wikipedia.org/wiki/Flags_...Southern_Cross

Good luck getting your camera working.

Philip

I didn't know that!
Thanks!

Paulo
P.S. And my sincere apologies to everyone from both countries!

[PauloEgidio]

Originally Posted by Nikolas

Yes we are as this is mainly an Australian (and some New zealanders) forum.
You need to try the eyepiece projection as this is what will work for you.

Nikolas, what is an eyepiece projection?

Do I have to attach the camera after the eyepiece?

The camera's manual says vaery clearly that you remove the eyepice and attach the camera without it.

Thanks!
Paulo

[iborg (Philip)]

Hi Paulo

To explain eyepiece projection try this link.

I have not watched it all.

https://www.youtube.com/watch?v=ckfdaSeSoCI

Good luck

Philip

[raymo]

Some eyepieces are threaded at the top[beneath the rubber eyecup] which
avoids the need for the adaptor shown in the video. The eyepiece screws directly into the T-ring.
raymo