Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens User Manual

1. はじめに

This manual provides instructions for the proper use and care of your Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens. This lens is designed to produce a diagonal fisheye effect, capturing a wide field of view across the entire frame of a full-frame camera. It is compatible with Canon SLR cameras and is ideal for creative photography, offering unique perspectives not visible to the human eye.

最適なパフォーマンスと寿命を確保するために、レンズを使用する前にこのマニュアルをよくお読みください。

2 製品の特徴

• Diagonal Fisheye Design: Captures a distorted, ultra-wide perspective across the entire image frame.
• 近距離撮影距離: Allows for focusing as close as 5.9 inches (0.15 meters), enabling unique close-up shots with exaggerated backgrounds.
• 明るいf/2.8絞り： Provides excellent low-light performance and shallow depth of field capabilities.
• DG Lens Design: Optimized for digital SLR cameras, minimizing flare and ghosting.
• 一体型レンズフード: Fixed petal-type lens hood helps to reduce flare and protect the front element.

3. パッケージ内容

パッケージにすべてのアイテムが揃っていることを確認します。

• Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens
• フロントレンズキャップ
• リアレンズキャップ
• Fitted Padded Carrying Case
• Gelatin Filter Holder (at the rear of the lens)

4. セットアップとインストール

Follow these steps to attach the lens to your Canon SLR camera body:

1. レンズとカメラを準備します。 Ensure both the camera and lens are powered off. Remove the rear lens cap from the Sigma lens and the body cap from your camera. Avoid touching the lens elements or the camera's sensor.
2. Align Mounting Marks: Align the red index mark on the lens barrel with the corresponding red index mark on your Canon camera's lens mount.
3. レンズを取り付ける: Gently insert the lens into the camera's mount. Rotate the lens clockwise until it clicks into place, indicating it is securely locked.
4. フロントキャップを外す: 使用する前にフロントレンズキャップを外してください。

画像: 背面 view of the Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens, highlighting the Canon EF mount and electrical contacts for secure attachment to the camera body.

To detach the lens, press the lens release button on your camera body and rotate the lens counter-clockwise until it disengages. Replace both lens and body caps immediately after removal to protect the components.

5. 操作手順

5.1.フォーカスモードの選択

画像: サイド view of the Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens, indicating the AF/M switch for selecting autofocus or manual focus mode.

The lens features an AF/M switch on its barrel to select between Autofocus (AF) and Manual Focus (M) modes.

• オートフォーカス（AF）： Slide the switch to 'AF'. The camera will automatically focus on your subject.
• マニュアルフォーカス（M）： Slide the switch to 'M'. Rotate the focusing ring on the lens barrel to adjust focus manually. This mode is useful for precise focusing or in situations where autofocus struggles.

5.2. Understanding the Fisheye Perspective

Image: The highly curved front element of the Sigma 15mm fisheye lens, reflecting a wide, distorted view of trees, illustrating the unique perspective captured by the lens.

This is a diagonal fisheye lens, meaning it projects a highly distorted, ultra-wide image that fills the entire rectangular frame of a full-frame sensor. Straight lines near the edges of the frame will appear curved. This effect is intentional and is a key characteristic of fisheye photography.

To utilize the fisheye effect creatively:

• Exaggerate Perspective: Place subjects close to the lens to emphasize their size and create dramatic distortion.
• Curved Horizons: Tilt the camera up or down to intentionally curve the horizon line for artistic effect.
• Wide Interiors/Landscapes: Capture expansive scenes or entire rooms in a single shot.

5.3. Aperture and Depth of Field

画像: サイド view of the Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens, displaying the aperture ring and focus distance scales in both feet and meters.

The lens has a maximum aperture of f/2.8, allowing for photography in low light conditions and control over depth of field. The aperture is controlled via your camera body. Refer to your camera's manual for specific instructions on adjusting aperture settings.

Due to the ultra-wide focal length, this lens inherently provides a large depth of field, meaning more of the scene will appear in focus even at wider apertures.

6. メンテナンスとケア

• レンズ要素のクリーニング: Use a soft, clean microfiber cloth specifically designed for optical lenses. For stubborn smudges, use a small amount of lens cleaning fluid applied to the cloth, not directly to the lens.
• レンズ本体のクリーニング： Wipe the lens barrel with a soft, dry cloth. Do not use organic solvents like paint thinner or benzene.
• ストレージ： When not in use, always attach the front and rear lens caps. Store the lens in its padded carrying case in a cool, dry place, away from direct sunlight and extreme temperatures. Avoid storing near mothballs or chemicals that can damage lens coatings.
• 取り扱い： Avoid dropping or subjecting the lens to strong impacts. Do not attempt to disassemble the lens, as this will void the warranty and may cause damage.

7。 トラブルシューティング

レンズに問題が発生した場合は、次の一般的な解決策を検討してください。

• レンズがしっかりと取り付けられていない: Ensure the red index marks are aligned and the lens is rotated fully until it clicks. Check for any obstructions on the camera mount or lens mount.
• オートフォーカスが機能しない:
  • Verify the AF/M switch on the lens is set to 'AF'.
  • カメラのフォーカス モードがオートフォーカスに設定されていることを確認します。
  • Check for sufficient light and contrast in your subject.
  • レンズとカメラ本体の両方の電気接点を清潔で乾いた布で拭いてください。
• Image quality issues (e.g., blur, dust):
  • Ensure the lens elements are clean and free of dust or smudges.
  • Check that the lens is securely mounted to the camera.
  • Verify that the camera's shutter speed and aperture settings are appropriate for the lighting conditions.

問題が解決しない場合は、カメラの取扱説明書を参照するか、シグマのカスタマー サポートにお問い合わせください。

8. 仕様

9. 保証とサポート

For warranty information, service, or technical support, please refer to the warranty card included with your product or visit the official Sigma Corporation of America webサイトでご確認ください。保証請求の際は購入証明として領収書を保管してください。

Sigma Corporation of America Contact Information:

• Webサイト： シグマフォト
• 製品のパッケージまたは公式 web現在の連絡先の詳細については、サイトをご覧ください。