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CHEAPEST Extension Tube

Posted: Wed May 23, 2018 8:25 pm
by TheSkyBurner
It seems that there is some sort of mafia controlling the cost of telescope extension tubes, so I found this little gold mine to circumvent the price of gold applied to aluminum.

This is an extremely reliable source of extensions, so do not let the 'made in china' propaganda fool you. I have personally ordered 100 of them and they arrived in less than 10 days.

For this to work properly, You need both of these parts to allow direct stacking of these tubes. You cant beat this price, and functionality. One part is a 58mm male thread to 52mm female thread, the other part is a 52mm male to 58mm female lens shade.

the standard telescope 2" male/female thread is 48mm. So a 48mm to 52mm step up ring is all you need left to work out whatever function you need. As an example of how fun this can be, I have attached a photo of these things attached to a PST gold tube. (a neat project Im working on!)

https://www.ebay.com/itm/Screw-Mount-52 ... 2701855228

https://www.ebay.com/itm/58mm-52mm-58mm ... 2258947368
60 extension tubes.jpg
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52-50mm 58-52mm 52mm extension.jpg
52-50mm 58-52mm 52mm extension.jpg (301.74 KiB) Viewed 643 times
pst large extension 52mm tube.jpg
pst large extension 52mm tube.jpg (243.23 KiB) Viewed 643 times

Re: CHEAPEST Extension Tube

Posted: Wed May 23, 2018 10:18 pm
by marktownley
That's some extension! :D

Re: CHEAPEST Extension Tube

Posted: Wed May 23, 2018 11:55 pm
by TheSkyBurner
you know the only thing that makes this better? An extrusion...

https://www.ebay.com/itm/Meade-Aluminum ... 2660152609

Re: CHEAPEST Extension Tube

Posted: Fri May 25, 2018 9:43 pm
by TheSkyBurner
If you wish to adapt T2 2" adapters, you need these

https://www.ebay.com/itm/48mm-52mm-Step ... 2930842506

The first link converts a t2 female 48mm to 52mm female thread

https://www.ebay.com/itm/RISE-UK-52-48M ... 8264263541

This second adapter changes a 52mm female thread to t2 48mm female thread.

This is how you attach 2" filters or 2" eyepiece barrels, or various other 48mm adapters to make this a telescope standard compliant part.

Re: CHEAPEST Extension Tube

Posted: Wed Jun 06, 2018 9:27 pm
by TheSkyBurner
to make measuring easier for anyone trying to use these spacers

TWELVE of these spacers, completed and stacked is equal to 11 and 7/8th inches or 301.625mm +/- 1mm

12 spacers equals 301mm.jpg
12 spacers equals 301mm.jpg (88.34 KiB) Viewed 494 times
12 spacers equals 11 and 7.8th inches Z.jpg
12 spacers equals 11 and 7.8th inches Z.jpg (242.27 KiB) Viewed 498 times
inches to mm.jpg
inches to mm.jpg (18.1 KiB) Viewed 498 times

Re: CHEAPEST Extension Tube

Posted: Thu Jun 07, 2018 6:34 pm
by TheSkyBurner
58mm to 58mm extension tube helical focuser.

https://www.ebay.com/itm/Focusing-Helic ... 3264351370