Hi Ralph
Thanks for the info. I will try to get my friend at our local Bino. & Telescope Shop to make me an extension tube (equal to the Meade tube on the off-axis guider minus the thickness of the filter wheel).

Jan

"Ralph P. Pass III" wrote:

> The simple answer is yes. I got the Meade extension tubes. I removed the two tubes from the adapter and screwed the adapter directly into the 616. Works fine. The distance is a bit shorter than the standard T mount to the 416 (leaving off the 616). The effect with my 10" F/6.3 system is that the adapter, 616, and 0.63 focal reducer changes the scope to be an F/4.85 rather than the expected F/4. This is due to spacing being a tad less than 'normal'.
>
> Ralph
>
> Jan Barker wrote:
>
> > I have just aquired a second hand 416XT plus the 616 Filter Wheel. I am
> > a beginner to ccd imaging. I am using the CCD camera on a 10" LX200.
> > I have achieved close to good focus using the 416 attached to the rear
> > of the Meade off-axis guider supplied with the unit . Interposing the
> > 616 filter wheel ahead of the 416 seems to place the camera too far out
> > behind the scope to achieve focus.Do I need a shorter extension tube to
> > place the 416 at approximately the same distance from the rear of the
> > scope as I have described above?
> > I will probably use my Taurus Tracker instead of the Meade off-axis
> > guider, because the small off-axis mirror in the Taurus is adjustable in
> > two planes (whereas the Meade prism is fixed). This will enable guiding
> > with the 201 and I can also use a reticle eyepiece in the viewing port
> > to put the object on the chip.
> > However the question is still do I need a shorter extension tube?
> > TIA
> > Regards to all from Downunder
> > Jan Barker

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