observatory in Langendorf
As a long-standing amateur astronomer
active in photography, one knows that ultimately the aperture, the quality
of the optics and atmospheric visual quality determine the quality of high-resolution
After three decades of refractor
experience the limits of what was feasible were reached for me in relation
to the lens aperture (d = 225mm). More resolution could only be attained
at acceptable cost with mirror optics. For a solar, lunar and planetary
observer with fixed installation a Newtonian system is well suited. Provided,
however, that the quality of the optics is associated with high expectations
of the resolution. To eliminate any risk in this regard, I decided to buy
from the German manufacturer Alluna Optics. After a short delivery
time the ordered 410mm F4.7 Newtonian reflector arrived even weeks before
I had started to modify the truss tube of the existing 225mm solar telescope.
A construction phase lasting about a week then sufficed to make the Newton
telescope ready for use.
The mirror saw the light of day
in February of 2008.
I had never seen the moon before
at the very high magnification of 400 to 800-fold as bright and especially
so sharp. The Orion Nebula clearly showed its colourful appearance at 50
to 200 × magnification. The constellation showed at an 800-fold magnification
an ideal diffraction pattern, which testifies to the very high optical
precision of the mirror. Other photographic results with a video camera
followed the first visual impressions and made my previous pictures of
the moon substandard.
In summary, I conclude that the investment
in the mirror system
from Alluna Optics was a very good
decision in my career as an amateur astronomer. Additional results
will in future be found on my website(www.unigraph.de).