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The T-adaptor is a short tube that places your camera film plane (CCD chip plane) at the focal plane of the telescope. Your telescope becomes a 1500mm 'lens'.
eg. A 50mm standard camera lens attached to an film SLR camera produces a 1x image. A 1500mm camera lens attached to the same camera would produce an image 1500/50 = 30x bigger (closer).
Not familiar with the D70 but I think the chip would be 2/3 film size so there is a 1.5x factor applied to the lens focal length to bring it up to film size. Therefore the mag factor would be 45x. If you had a digital camera with a full 35mm film size chip the magnifying factor would be 30x. I think I'm right this time.
Last edited by astro744; 06-12-2009 at 09:29 AM.
Reason: technical error corrected
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