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Quality CNC machined black-anodised focus extension tubes.
Brass compression ring fittings, safety under-cut in barrel and threaded for filters.
These 2" focus extension tubes are everything you want in a simple piece of metal that extends your back-focus in a 2" focuser. They are really well built, very sturdy and have an excellent, large compression ring for tension. The price on them is fantastic as well. I bought two 50mm ones for flexibility of back-focus. They are used stacked one into the other and attached to my 2" FeatherTouch focuser on my Altair Astro 8" RC. Since eyepieces require significantly more back-focus than my imaging optical train, I bought these to avoid having to remove the focuser and attach more focuser extension rings. Both of my 50mm tubes add much-needed 100mm of back-focus to reach focus on my eyepieces without touching the focuser.
This is a superb choice for extension tube - it's solidly built, yet very lightweight. It has a good quality compression ring, is well blackened, has a smart black finish and the safety-undercut is of a compatible design. One minor niggle is the locking screw, which is quite slim and difficult to get really tight.Best of all, it's very reasonably priced.
If you use a camera with a telescope and you add a barlow lens to increase magnification then you quickly discover that it has the effect of moving the plane of focus even further back behind the telescope. I discovered how much further back by holding my camera behind the barlow and moving it backwards with live view on until I saw a focused image. Then I measured with a ruler and worked out how much extra tube I needed, taking the travel of my telescope focuser into account.Once I knew that I bought one of these extension tubes and now I use it every time I use a barlow with my camera. It's well made, sturdy and never comes undone. Can't do without it.
First Light Optics Ltd Basepoint Business Centre Yeoford Way Marsh Barton Trading Estate Exeter, Devon EX2 8LB
Company No. 5892293 VAT No. 907 2895 01
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