MeterGlass

Support / 技术支持

English

About MeterGlass

MeterGlass is a simple and intuitive light meter app designed for film photographers. It uses your device's camera to measure ambient light and calculate exposure settings in real time.

How to Use

  1. Open the app, grant camera access, and set your film ISO (shown in red until confirmed).
  2. Average metering: point at the scene and read; choose continuous or single-shot, with AE-L lock.
  3. Spot metering: switch to Spot and tap where you want to meter (~1.5° acceptance angle; pinch to zoom for tighter spots).
  4. Zone System: enter Zone mode, capture shadow/highlight and more points, place readings on the zone strip, and review contrast and N± development suggestions. Generate and share a metering record image of the session.
  5. Film formats: pick a format (135 up to 8x10) at the bottom left — the mask shows your composition, displays the equivalent focal length, and metering respects the crop. Portrait/landscape framing supported.
  6. Filters & bellows: enter filter factors or bellows extension compensation in Settings; they are folded into the suggested exposure automatically.

Frequently Asked Questions

Why does MeterGlass need camera access?

MeterGlass uses the camera sensor to measure the light intensity of your scene. The app does not take photos or record videos — the camera is used solely for real-time metering. In Zone System mode you can, at your own request, generate a metering record image that includes the viewfinder frame, and choose to save or share it — entirely under your control.

Why does MeterGlass ask for photo library access?

Only when you share a Zone System metering card and choose "Save Image" in the system share sheet. MeterGlass requests add-only access: it can only add the image you chose to save, and cannot read or browse your photo library.

How do I calibrate the meter?

Go to Settings > Metering Calibration. Aim at an 18% gray card, or compare against a meter you trust, and fine-tune the reading in 0.1 EV steps until they match. Calibration applies to both average and spot metering. Note: calibration constants differ slightly between meter brands (e.g. Pentax vs Sekonic differ by about 1/6 stop) — this is normal.

How accurate is the metering?

MeterGlass provides reliable readings suitable for film photography. Results may vary slightly depending on your device model and lighting conditions. You can calibrate the meter in Settings, and we recommend bracketing your exposures for critical shots.

The app shows a black screen / camera won't start

Please check the following:

  • Go to Settings > Privacy & Security > Camera and make sure MeterGlass has permission enabled.
  • Restart the app.
  • Restart your device if the issue persists.

Can I use MeterGlass without an internet connection?

Yes. MeterGlass works entirely offline — no internet connection is needed.

How do I reset my settings?

Deleting and reinstalling the app will reset all preferences to their default values.

Contact

If you encounter any issues or have suggestions, feel free to reach out: Developer: LaoCui Email: cuicunbin@gmail.com We appreciate your feedback and will respond as soon as possible.

中文

关于 MeterGlass

MeterGlass 是一款简洁直观的测光表应用，专为胶片摄影师设计。它利用设备的相机实时测量环境光线并计算曝光参数。

使用方法

  1. 打开应用，首次使用时授予相机权限，并设置您的胶片 ISO（ISO 值未确认前会以红色提醒）。
  2. 平均测光：对准场景直接读数；可切换连续/单次测量，AE-L 可锁定读数。
  3. 点测光：切换到“点测”，点按画面中要测的位置（约 1.5° 接受角，捏合放大可更精确）。
  4. Zone System：进入 Zone 模式，依次采集暗部/亮部等多个点，在分区条上放置读数，查看反差与 N± 显影建议；可将本次测光生成图片保存或分享。
  5. 画幅与焦距：左下角可选择胶片画幅（135 至 8x10），遮幅显示构图并显示等效焦距，遮幅内测光；支持横竖构图切换。
  6. 滤镜与皮腔：在设置中输入滤镜系数或皮腔延伸补偿，会自动计入曝光组合建议。

常见问题

为什么 MeterGlass 需要相机权限？

MeterGlass 使用相机传感器来测量场景的光线强度。应用不拍摄照片、不录制视频，相机仅用于实时测光。在 Zone System 模式下，您可以主动生成一张包含取景画面的测光记录图并选择保存或分享——这完全由您控制。

为什么 MeterGlass 会请求照片权限？

仅当您在 Zone System 模式下分享测光记录图、并在系统分享面板中选择“存储图像”时才会用到。MeterGlass 申请的是“仅添加照片”权限：只能保存您选择的这张图片，无法读取或浏览您的相册。

如何校准测光读数？

在 设置 > 测光校准 中，对准 18% 灰卡或与您信任的测光表对比，用 0.1 EV 步进微调读数直至一致。校准同时作用于平均测光与点测光。注：不同品牌测光表标定常数略有差异（如 Pentax 与 Sekonic 约相差 1/6 档），属正常现象。

测光准确吗？

MeterGlass 提供适用于胶片摄影的可靠读数。结果可能因设备型号和光线条件略有差异。您可以在设置中校准测光表，建议在关键拍摄时进行包围曝光。

应用显示黑屏 / 相机无法启动

请检查以下事项：

  • 前往 设置 > 隐私与安全性 > 相机，确保 MeterGlass 的权限已开启。
  • 重启应用。
  • 如问题持续，请重启设备。

没有网络可以使用吗？

可以。MeterGlass 完全离线运行，无需网络连接。

如何重置设置？

删除并重新安装应用即可将所有设置恢复为默认值。

联系方式

如果您遇到任何问题或有建议，欢迎联系我们： 开发者：LaoCui 邮箱：cuicunbin@gmail.com 感谢您的反馈，我们会尽快回复。