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General| Mount | Leica R |
|---|---|
| Focal Length Range | Varies by lens model |
| Aperture Range | Varies by lens model |
| Lens Type | Prime and Zoom |
| Focus Type | Manual |
| Compatibility | Leica R cameras |
| Aperture Blades | Varies by lens model |
| Optical Design | Varies by lens model |
| Minimum Focusing Distance | Varies by lens model |
| Filter Size | Varies by lens model |
| Weight | Varies by lens model |
| Lens Construction | Varies by lens model |
| Filter Thread | Varies by lens model |
| Dimensions | Varies by lens model |
Introduction to Leica R-Lenses, authored by Erwin Puts, setting the context for the lens review.
Identification of the LEICA VARIO-ELMARIT-R 28-90 MM F/2.8-4.5 ASPH as the primary subject of the chapter.
Traces the historical evolution of zoomlens design, from early cine cameras to modern high-quality optics.
Highlights innovative features of the new Leica zoomlens, including zoom ratio, mechanical design, and ergonomics.
Discusses the practical zoomrange and how aperture settings vary across focal lengths for optimal use.
Details the complex optical design, precision mechanics, and assembly challenges for the lens.
Explains the intricate assembly process, tight tolerances, and adjustment methods ensuring lens quality.
Evaluates the high contrast and resolving power at 28mm focal length and full aperture, including image data.
Details the lens's performance at 35mm and 50mm, covering contrast, resolution, distortion, and vignetting.
Assesses superb image quality at 70mm and best performance at 90mm, including distortion and vignetting.
Compares the Vario-Elmarit-R 28-90mm to the Apo-Summicron-R 90mm, highlighting differences in depth of field and sharpness.
Discusses focusing challenges with the R8/9 finder at extreme focal lengths and suggests practical focusing techniques.
Evaluates the lens's veiling glare and secondary reflections, noting minimal contrast loss.
Summarizes the lens as an outstanding performer, a Pareto optimum in size, ergonomics, and performance.
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