This feature is also a welcome relief for our taller scopes, such as the 20" F/4.5 where installation of the Upper Tube Assembly (UTA) on top of the truss poles would require a ladder. Astrosystems rigid 4-vane Spider and Secondary Mirror Holder with four-point collimation adjustment. However in my case I found out that at low speed settings the vibrations are negligible, and I couldn't notice any effect from them even during planetary astrophotography. Rigel Systems QuickFinder reflex finders. Truss Pole Carry Case (Shrouds by Heather). They virtually disappear after wood stain, sealer and polyurethane/varnish are applied. At maximum speed on a 8" telescope - the vibrations did blur the stars into long streaks, but I only use this speed for the initial cool-down. Your choice of focuser colors include Black, Red, Green, Blue and Gold. Velvet light-trap across from focuser in Upper Tube Assembly to help yield a rich, dark, contrasty starfield when observing through the scope. Usually these are small intake fans (with dust filters), probably to better direct the air stream and increase the "blow off" effect, and they are turned on during the whole observing session. Dual Boundary Layer 12-volt Cooling Fans which pull ambient air into the mirrorbox and vent through a pattern of ventilation holes on opposing side of mirrorbox, effectively "scrubbing" the turbulent boundary layer away and allowing you to start observing earlier in the evening instead of waiting for the boundary layer to dissipate naturally. A combination of rear and side fans can be used both for effective cool-down and for controlling the boundary layer. Power from a battery source enters the DewBuster and then is split out via the various ports to electronics such as dew heaters, setting circles, cooling fans, etc. Standard on all Truss-Dobsonians 12.0" and larger. Each way have its advantages and disadvantages: A large rear mounted intake fan, which blows the air on the mirror's surface, is the most effective for actually cooling the mirror. In any case it's a good idea to have an option to limit the RPM speed by supplying a lower voltage (or adding a series resistor). Bespoke Telescope Design, Fabrication, Sales & Service Since 2002, Black Velvet Light Trap in Upper Tube Assembly, Moonlite Ball & Socket Lower Truss Connectors, Virgin Teflon with Center Pad for Azimuth. Note that it my latest 12" Orion UK Newtonian the factory mounted small fan is also integrated into the mirror cell, and it's not causing noticeable vibrations. This oustanding innovation allows the user to keep their scope assembled into two major sections, which allows for quicker assembly in the field as compared with other similar Truss-Dobsonian designs. There are more "exotic" methods - like suspending a small fan in front of the mirror, attaching a metal cooler or a peltier devices on the mirror's back end, or using a rear intake fan with a diaphragm around the main mirror (which forces the air to blow on mirror's surface). We have discriminately chosen CATSEYE center spots for application to all our scope Primaries and confidently recommend CATSEYE passive tools and accessories for your collimation needs to enable you to get the best possible performance from our products - See the CATSEYE Site for more info on these collimation tools: www.catseyecollimation.com. There are many variations: An intake or an exhaust fan, one big or a several small ones. The T&G yields more surface area which translates to more "Glue Surface Area" which means more holding power within that corner joint.
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