{
  "slug": "sigma-17-40-f18-dc",
  "name": "17-40mm F1.8 DC | Art",
  "category": "lens",
  "specs": {
    "maker": "シグマ",
    "released": "2025-07",
    "mount": "ソニーE / ライカL / 富士フイルムX / キヤノンRF",
    "format": "APS-C",
    "focal_length": "17-40mm",
    "max_aperture": "f/1.8",
    "elements": "11群17枚",
    "blades": 11,
    "min_focus_m": 0.28,
    "max_magnification": "0.21倍（焦点距離40mm時）",
    "stabilization": "なし",
    "filter_mm": 67,
    "weight_g": 525,
    "size_mm": "72.9x117.9",
    "weather_sealed": "簡易対応",
    "price_range": "約13万円前後"
  },
  "summary": "一眼レフ時代の名玉18-35mm F1.8の思想をミラーレスで受け継いだ、APS-C用ズーム全域開放F1.8の Art ライン大口径標準ズーム。35mm判換算25.5-60mm相当を単焦点並みの明るさと描写でカバーし、インナーズームと絞りリングで動画用途にも強い。525gと先代より大幅に軽くなり、4マウントで展開されている。",
  "amazon_query": "シグマ 17-40mm F1.8 DC Art ソニーE",
  "construction_url": "https://www.sigma-global.com/jp/lenses/a025_17_40_18/?tab=construction",
  "mtf_url": "https://www.sigma-global.com/jp/lenses/a025_17_40_18/?tab=construction",
  "source_url": "https://www.sigma-global.com/jp/lenses/a025_17_40_18/",
  "retrieved_at": "2026-07-24",
  "product_url": "https://www.sigma-global.com/jp/lenses/a025_17_40_18/"
}