![Praktica MTL50. Does anyone know how to recalibrate this? I was took out the screw of shutter selector knob and messed up the light metering. How do I calibrate it back... Help : Praktica MTL50. Does anyone know how to recalibrate this? I was took out the screw of shutter selector knob and messed up the light metering. How do I calibrate it back... Help :](https://preview.redd.it/ww10ym8v9kj01.jpg?auto=webp&s=a15a2b7dfed162ea8fd0f85d2f1d8d537cc3f8d8)
Praktica MTL50. Does anyone know how to recalibrate this? I was took out the screw of shutter selector knob and messed up the light metering. How do I calibrate it back... Help :
How to turn your iPhone into a photographic light meter — Luxi For All | Lux Light Sensor | Light Meter
![Illuminance Meter Calibration Kit - Hoffman Engineering for LED Aircraft Lighting and Marine Lighting Illuminance Meter Calibration Kit - Hoffman Engineering for LED Aircraft Lighting and Marine Lighting](https://hoffmanengineering.com/wp-content/uploads/2018/10/Illuminance-Meter-Calibration-Kit.jpg)
Illuminance Meter Calibration Kit - Hoffman Engineering for LED Aircraft Lighting and Marine Lighting
![Amazon.com : Dr.meter Professional LED Light Meter, Digital Illuminance Meter with 0-200,000 Measuring Ranges and 270 Degree Rotatable Detector : Electronics Amazon.com : Dr.meter Professional LED Light Meter, Digital Illuminance Meter with 0-200,000 Measuring Ranges and 270 Degree Rotatable Detector : Electronics](https://m.media-amazon.com/images/I/71QMz1zVYuL._AC_UF894,1000_QL80_.jpg)