Camera and 2x Barlow... no focus?

[sletts02]

I am trying to use my 550D alongside a 2X Barlow in my Newt however am encountering some troubles with my Newt.

I think it is a focus issue. Without the 2x Barlow I can easily get focus. However, with the 2x Barlow attached I get just black. I investigated further and took over-exposed images and was presented with a huge doughnut ring (the out of focus image that my Newt returns).

I've tried to mount the barlow directly to the t-ring, as well as with the t-adapter. I have taken out the eye piece holder and used extra large screws to get it closer in the focusing tube and still no luck.

Any ideas on how I can fix this?

(Sorry about the lack of images, at my Mrs and using a very bad PC)

[sletts02]

Had a play in daylight using the neighbours house as a reference point (I swear I'm going to have the police knocking on the door soon, especially as I had my camera out!).

I think I've fixed it. It turns out I needed the camera to be further away rather than closer.

Will see how it works with Jupiter tonight, fingers crossed. Then I can work on my GOTO problems... :/ Such a huge learning curve, especially when things don't work.

[michaellxv (Michael)]

If you need to move the camera back then an extension tube may be helpfull.
If you do need to move the camera closer to get focus then depending how far a low profile focusser may be enough or else you would need to move the primary mirror up the tube.