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.
Jun 3, 2018
MONEY WELL SPENT !!!Pros: Cons: Comments:
Yes, it is expensive. But, you get what you pay for!
I use to use a cheshire collimator, and thought it was accurate. Was I wrong. The TuBlug, uses a barlow lens. The Barlowed technique of collimating the primary lens, is much more accurate.
I now collimate my dobsonian, before each use, with confidence, that it is perfectly collimated.
Use the TuBlug, with the Glatter laser collimator. You will get perfect collimation, every time.
One word of advice. There are no directions, included. To use the TuBlug, you must unscrew the white disc, on the bottom of the Glatter laser. This will help diffuse the laser beam, when used with the TuBlug. It sounds counter intuitive, but it really does work. When your are done collimating the primary, remove the TuBlug, from the scope. Screw the white disc back onto the Glatter laser, and then collimate the secondary.
This review was provided courtesy of AgenaAstro.com
- Skill Level
- Time with Product
May 13, 2016
- User Notes:
- Review by Carl T of O'Fallon, MO.
Easy to get good collimationPros:
Easy to Use,Accurate,Strong ConstructionCons:
The Howie Glatter 2" TuBlug, in conjunction with the 2" collimator, allows you the get quick, accurate collimation of your Newtonian. The large angled surface gives you plenty of area to see the shadow of the center spot when your primary is not close at the start of collimation. Very easy to use and, like all of Howie Glatter products, The tolerances and machining are first rate.
This review was provided courtesy of AgenaAstro.comJun 25, 2014
Very accurate and useful add-onPros:
Strong Construction,Lightweight,Easy to Use,Quality Lenses,Compact,AccurateCons: Comments:
Using the dual 2" / 1"1/4 barrel Howie Glatter laser collimator (just to be able to help other users having smaller instruments, actually), its longer barrel allows to go deeper into the focuser than the regular 2" model, allowing to see much more easily the return pattern when using the barlow lens attachment, by just peeking through the telescope tube opening.
However, since I'm using a large closed tube newtonian, I still had to move from the back of the mirror cell to the front of the tube to check the collimation.
Now with this add-on, you can see what you do from the back of the scope without hassle!
The returned ring pattern is large and accurate, so you can achieve a very precise primary collimation. The barlow lens is built in the TuBlug, so no need for an additional tip. I recommend using the "crosshair and circle" pattern holographic attachment for secondary mirror collimation : http://agenaastro.com/howie-glatter-holographic-attachment-crosshair-circle-scope-pattern.html
I would have gladly selected the 2" TuBlug instead, but once again, the 1"1/4 model allows me to help other people... Plus it's much less bulky and is easier to fit in your accessories suitcase! The 45
This review was provided courtesy of AgenaAstro.comSort by