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Celestron XLT 150 Reflector- Why this Extra Tube?

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#1 wmgeorge

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Posted 18 October 2020 - 01:30 PM

Just purchased the above Omni XLT 150  scope and it came with what looks to be 2 inch Diameter by maybe 2 inch or so extra tube. The owners manual says Zero about it but some online Videos shows mounted on the   Focus tube.  It works fine without it an focuses at least in what little  testing I have done. Going to try to post a couple pictures.

 

IMG_5290.JPG

 

And with out it, works fine... sorry about the clutter!!

IMG_5289.JPG


Edited by wmgeorge, 18 October 2020 - 02:01 PM.


#2 vtornado

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Posted 18 October 2020 - 02:03 PM

I have one for my skywatcher dob.  There is one in your scope that is for 1.25 inch accessories, and the one you have picture is for two inch. 

Modern scopes are trending to be able to come to focus with a camera, which needs to be closer to the objective than an eyepiece.

These extenders allow the scope to be used by both a camera and visually.


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#3 tony_spina

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Posted 18 October 2020 - 02:13 PM

Its a 2" focuser tube extension.   The scope is designed for astrophotography so some eyepieces might not reach focus without the extension 



#4 wmgeorge

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Posted 18 October 2020 - 02:16 PM

I have one for my skywatcher dob.  There is one in your scope that is for 1.25 inch accessories, and the one you have picture is for two inch. 

Modern scopes are trending to be able to come to focus with a camera, which needs to be closer to the objective than an eyepiece.

These extenders allow the scope to be used by both a camera and visually.

OK maybe that is why the extender has threads on one end, on the inside? Thanks for taking the time to reply.



#5 MellonLake

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Posted 18 October 2020 - 02:19 PM

The threads on the inside at the bottom end are for filters.



#6 wmgeorge

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Posted 18 October 2020 - 06:17 PM

Thanks again folks.... so this means I can leave  this piece at home in the box.



#7 vtornado

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Posted 18 October 2020 - 06:41 PM

Yes, unless you plan to use 2 inch eyepieces




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