Our late and very dear friend Douglas Arnold had the graciousness to remember the group in his will. He bequeathed his entire Astronomical library including many very valuable books which we could not ordinarily every have expected to acquire. The collection is so comprehensive that the Group must now possess one of the most up to date reference libraries the envy indeed of any amateur astronomical society in the UK . Covering subjects as varied as the History of Astronomy to the Workings of the interior of the Sun. The books will be education and a source of inspiration for all members.
Furthermore, Audrey, Douglas 's wife, very graciously donated his pride and joy the Astro-Physics 7" Starfire refracting telescope complete with the dome in which it was housed, that stood so proudly in the garden of their home. This was the telescope that Douglas used to take some of his most brilliant, world renowned, Lunar and Solar images. Douglas and Audrey, in an act of double graciousness, elevated the Hampshire Astronomical Group to new heights of equipment standard than we ever thought possible. We are humbled that they both so wished to think of us and so proud to be the beneficiary of their overwhelming generosity.
Astro-Physics 7-inch 'Starfire' F9 Apochromatic Refractor
If Achromatic means "no colour" then Apochromatic might be refined as "really, really no colour". While an Achromat brings two wavelengths of light at opposite ends of the spectrum to a common focus, it still leaves residual chromatic aberration along the optical axis.
Apos, as they are affectionately known by astronomers, eliminate residual chromatic aberration almost completely by using two, three or four- element objective lenses using special glass type (often Fluorite) SD' special-dispersion or 'ED' short for extra-low-dispersion glass. Apochromats minimize dispersion of light by bringing all wavelengths to just about the same focus.
For either visual or photographic use, ASTRO-PHYSICS Apochromatic Refractors are regarded as the best of their kind available. We are extremely fortunate indeed to have one of their finest housed in our Observatory.