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I purchased a second hand Skywatcher 150 Newtonian and it came with a 37.5 mm. tube with 2 grub screws in it.. As a complete newbie I don’t know what this is for. Any help would be greatly appreciated. Best regards

Neil

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I cannot get any eyepieces to focus on my SkyWatcher 200 Newtonian without it.

 

This YouTube video will help answer the question about getting a DSLR to focus with your scope.

 

 

Edited by Star Struck
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Hello Neil, welcome to this forum.

Astrophotography is such a popular aspect of amateur astronomy these days that manufacturers are increasingly configuring telescopes so that a camera will come to a focus. The camera focuses closer to the telescope which means that eyepieces focus further out, the extension tube makes up the difference.

 

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17 hours ago, Peter Drew said:

Hello Neil, welcome to this forum.

Astrophotography is such a popular aspect of amateur astronomy these days that manufacturers are increasingly configuring telescopes so that a camera will come to a focus. The camera focuses closer to the telescope which means that eyepieces focus further out, the extension tube makes up the difference.

 

Does this mean they are using oversized secondaries to fully illuminate the eyepiece's field of view given the high profile of the focuser?

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