高山仁

A world-class optical designer with over 40 years of dedicated experience in the field of lens engineering. While his expertise is global, his reality is that of a "distinguished elder" operating a modest, boutique optical design office. He serves as the Chairman of the Lens Review Consortium and, in his private life, remains a humble, devoted servant to his beloved granddaughter. Feel free to link to or quote this blog for your own content. For the latest updates and lens analysis news, please follow me on X (formerly Twitter).

Analysis

[Optical Engineer's Review] PENTAX 110 20-40mm F2.8 - Analysis 147

2026/5/8    

Explore the hidden optical secrets of the PENTAX 110 20-40mm F2.8, the world's only constant-aperture zoom for the 110 format. In this deep-dive analysis, a professional optical engineer deciphers historical patent data (JP, S57-104108) to reveal simulation results, MTF curves, and spot diagrams. Discover how Asahi Optical overcame the challenges of the "behind-the-lens diaphragm" to create this miniature engineering marvel.

Analysis

[Lens Review] SIGMA 50mm F1.2 DG DN Art: The Pinnacle of Optical Engineering

2026/5/8    ,

Professional optical designer Jin Takayama analyzes the SIGMA 50mm F1.2 DG DN Art. This deep dive covers patent research, longitudinal aberration, and MTF simulations to reveal the true performance of Sigma's flagship F1.2 standard prime. Discover why this 'Made in Aizu' lens is a masterpiece of modern optics.

Analysis

Deep Analysis: NIKON NIKKOR Z 24-50mm f/4-6.3 – The Compact Engineering Marvel

2026/5/8    

Executive Summary: NIKKOR Z 24-50mm f/4-6.3 Analysis
This analysis uncovers the hidden potential of Nikon’s compact zoom, revealing a sophisticated optical design that defies its "entry-level" label. Through patent research, I explore a fascinating collaborative link between Nikon and Konica Minolta, adding historical depth to this modern optic. Despite its modest aperture, simulation data—including detailed spot diagrams and MTF charts—demonstrate exceptional central sharpness and well-balanced aberration control. From its nostalgic focal range to its clever retractable mechanics, this lens embodies Nikon's commitment to quality for every photographer. It is a masterclass in balancing portability with high-level optical engineering.