<<
>
>I looked up your reference # on ebay and see that's exactly what you're
>talking about here for telescopes. An extension tube would move the
>eyepiece further from the body of the scope and allow focusing on
>objects closer than the scope was designed for.
>
Imagine using my 90x1000mm for wildlife spotting. Photograph elk
from a quarter mile away.
Chris
>>
IMHO, this item is only useful for visual purposes with an eyepiece.
For photo you need a threaded extension tube, usually a T thread
on the camera end, so you can mount the correct T ring.
See here for what I mean (note that there are T rings for virtually
every camera maker, I have one for Olympus OM):
http://www.celestron.com/browse-shop/astronomy/astroimaging-accessories/t-rings-and-adapters/universal-125-t-adapter
http://www.celestron.com/browse-shop/astronomy/astroimaging-accessories/t-rings-and-adapters/t-adapter-for-schmidt-cassegrain-telescopes
http://www.celestron.com/browse-shop/astronomy/astroimaging-accessories/t-rings-and-adapters/t-ring-for-canon-eos-camera
Ralf
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