Does this 4-inch apo refractor‘s lenses effectively counter colour fringing?

To enjoy views or photographs of the night sky in natural colour is a real pleasure. However, achieving those images requires an apochromatic telescope with special lenses designed to remove chromatic aberration. The Omegon 104/650 ED uses a triplet lens system with air-spaced elements constructed from FPL-53 and FPL-51 glass to bring the major colour wavelengths of light to a matching focus point. At the eyepiece the effectiveness of the triplet lens was easy to see. We observed bright targets including the Moon, Jupiter, Venus and Mars, carefully checking for any tell-tale blue haloes or green and purple fringing. At the centre of the view we found the colour correction of this lens to be excellent, allowing observation of smaller details in Jupiter’s bands and even on Mars, which was not best placed for observing. Our cameras confirmed the findings from the eyepiece, a full frame DSLR and colour CCD camera producing images of stars without bloated blue haloes, ably demonstrating that the Omegon 104/650 ED deserves its ‘apochromatic’ badge.