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D-150 Curvulon and Kollmorgen | Read more at in70mm.com The 70mm Newsletter |
| Written by: Glenn Berggren | Date: March 18, 2004 |
 Lens picture by Thomas Hauerslev, February 2004As to D-150, I got Kollmorgen to design /create a 2X magnifier to be used with their older BX 265 (4" diameter) lenses of 5" to 9", and that is what Dick Vetter was using, but in the R & D efforts with the first sample of the 2X, we found that it could handle adjustment, and that the adjustment WOULD vary the field curvature, which made it quite valuable for Vetter's installation work, so that he could result in uniform screen image focus all over the field from the first turn of the focus knob. But this opens a very large discussion about lenses, film and field curvature, which I shall defer to a future time. As you know the last and best lenses created for 70mm films was the Ultra-HD-70 in odd focal lengths of 99, or 81mm, etc. These were far beyond in optical quality, compared to anything made from 1954 to 1990, and had the curved film shape designed into them. | Further in 70mm reading: Dimension 150 The D-150 Curvulon Lens Internet link: Kollmorgen |
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