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FIRST 16" DALL-KIRKHAM TUBE ASSEMBLY DELIVERED

Another simple and practical telescope designed for high resolution work.
Click here for large format pictures


First look at the first quarter moon. Later, after the telescope cooled off, powers of 600 showed a clear and crisp image. Curved vane spider showed no spikes on bright Capella.

 


Just after initial set up - secondary still has protective covering.

 


Rear view showing focuser, collimation screws and slewing handles. The full Surrier tube structure is made entirely of aluminum solidly welded and bolted together and attractively powder coated in semi-gloss black for the end parts and gold vein texture for the struts and center square. A powder coated surface is very tough and particularly resistant to the effects of bumps abrasion. The entire OTA weighs only about 95 lbs. Note finder scope mounting bracket at top of back plate. The tube separates at the center square for easier handling. Front section weighs 22 lbs and back section 73 lbs.

Front end shot shows the double curved spider and generally light and simple nose unique to this telescope; no heavy spider vanes or large obstruction out there. This spider produces less wavefront degradation than if a Maksutov type corrector were used, assuming losses through typical design and fabrication errors - imagine the additional weight and cost of a 16" Mak corrector, yet here we have only two simple mirrors. Careful scrutiny could detect no spikes or other diffractive abnormalities even on very bright stars such as Capella. And careful design work and proportioning of optical system suppresses coma to within the diffraction limit and an unobservable level even at the edge of the field. Central obstruction is only 25% of primary diameter. 

As I have often advised, this is not a general purpose all around observing telescope but for some it's the telescope they have long been waiting for, a true planetary Dall-Kirkham.

As things progress I'll be posting more extensive photos as well as additional technical detail.