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Hi Martin
There are two main methods used with a telescope in astro photography.
The first image shows the “Prime Focus” method.
The second image shows the “Eyepiece Projection” method.
For Prime Focus, you need a T2 adapter which fits the DSLR (without lens) to the telescope focuser.
I think your photo shows a device used for “Eyepiece Projection”.
Cheers
Dennis
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