With self-assembly, the focal point is sometimes located far beyond the tube, beyond what your extension tube can reach. This 69.9 mm (about 2.75 inch) focal server from Starlight Instruments places a 2 inch (about 7 cm) focal distance from the tube.
The increase occurs between the focus base and the focus, so that the entire focusing range extends outwards. This is more robust than an extension tube in the extension tube, because the extension tube itself does not have to extend further.
Determine in advance how much extra range you need, because you lose the same amount of range when you go inside. Newton telescope Furthermore, the further the focus of the tube is, the larger the viewfinder must be to fully illuminate the field of view.
If you fall short less often, then The 1.4 inch increase enough. For even more height there is The increase of about 3.75 inches.
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