Howie Glatter 1.25 Inch TuBLUG
|The 1.25-inch tuBlug is a collimator accessory that allows Barlow collimation of the primary mirror from the back of the telescope. This item is generally reserved for use on telescopes equipped with 1.25-inch focusers. Owners of telescopes with 2-inch focusers generally preder to use botha 2-inch collimator and TuBlug. |
The tuBlug is the answer for those who want to Barlow-collimate their primary from the back of the scope, but have a solid tube Newtonian, or can't be bothered to slide their shroud up.
It's a Blug (Barlowed laser plug), containing its own lens and shadow screen that fits within a side cut-out tube, the combination being known as a tuBlug. Like the collimator self-Barlow attachment or the Blug, it uses the Barlowed laser principle to project a silhouette shadow of the primary mirror collimation mark back onto its white screen, where the shadow is centered to collimate the primary. The tuBlug comes in 1-1/4" and 2" sizes, fits any focuser, and can be used with any well-centered laser collimator.
Unfortunately, the standard Blug which fits to the inner end of the focuser drawtube inside the telescope, can not used as a tuBlug because it must necessarily have a shoulder which will seat it squarely against the end of the drawtube. The shoulder will be larger than eyepiece diameter, which will prevent the Blug from fitting in the side cut-out tube.
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