Some of this vignetting was corrected by flat-field calibration, but the short, fast Newtonian system would have benefitted from a larger focuser
and coma corrector that offered better corner-to-corner illumination.
L Lombard for 6-inch f/8 Dob sporting a low profile Crayford focuser
and altitude trunnions running on bearings with an adjustable damper that sill needs a little more development to be effective.
was constructed from 2" x 2" x 1/4" aluminium angle section for the main body, and 1 1/2" x 1 1/2" aluminium angle for other parts.
will also accept 2- inch-diameter eyepieces.
Perhaps the most impressive feature of this entire system is the way one secondary cage can be removed and the other one attached, and the corrector lenses in the focuser
drawtube can be swapped out--and when you're done you have a completely different system without even having to re-collimate.
25-inch eyepieces--10 mm (60x) and 25 mm (24x)--and a 2-inch focuser
Also, if they weren't on tight, I found they could loosen and turn under the weight of a star diagonal and heavy eyepiece if they were tilted towards the left side of the focuser
, causing them to unscrew and flop down unnervingly.
After you've made your cutouts and glued your felt wings on, spray-paint the whole works flat black, using a paint that's designed for plastic, and mount it on your focuser
This is especially true of the precision 5-inch dual-speed, rack-and-pinion focuser
and 360[degrees] camera rotator.
8 pounds and comes standard with a 2V2-inch, dual-speed, rack-and-pinion focuser
with 80 mm of travel.
Its rack-and-pinion focuser
accepts l>4-inch eyepieces and includes a pair of 25- and 10-mm Kellners that yield 20 and 50x, respectively.
The FSQ-130ED's 5-inch focuser
is designed to handle heavy cameras and accessories, and includes a camera-angle adjuster that lets you rotate your camera without losing focus.
In addition to the carbon-fiber truss tube, a trio of cooling fans for the primary mirror, a dual-speed 3-inch Crayford-style focuser
, and a pair of Losmandy-style dovetail mounting bars, the scope features both mirrors made of fused quartz.