Most common questions used to investigate
Are your camera settings on full automatic mode?
Are you using a light meter to expose your photo?
Did you change the shutter speed and aperture indicated by the light meter?
Is your light meter charged?
Do your iso settings match the film you use?
Was your film exposed to light before entering development in a Dark Room?
Common conclusions
Your photos are over-exposed because you might be having a technical problem with your camera. Please visit a photo lab to check your camera.
Your photos are over-exposed because you may not have exposed them correctly. it is recommended to use a light meter in order to expose your photos properly.
Your photos are over-exposed because you have not exposed them correctly. When checking the light on your subject or scene, the light meter will indicate the needed shutter speed and aperture for your photo to be exposed correctly. If you fail to make the changes needed on your camera, your photos will surely get a wrong exposure, resulting in either under-exposed or over-exposed photos.
Your photos are over-exposed because the light meter you are using is not charged. Please charge your light meter to get the correct readings of light in your scene.
your photos are over-exposed because the film you are using does not match your iso settings. In analog photography each reel of film has a native iso. To receive a correct exposure, it is crucial to set the iso settings on your camera to match the iso of the film you are using.
A reel of film is extremely sensitive to light. Any exposure under the wrong circumstances, would result in over-exposed photos.
It seems that you are experiencing a technical problem with either your camera or light meter. Please visit a photo lab for further assistence.
References
https://www.instructables.com/id/A-Beginners-Guide-To-35mm-Film-Photography/
https://learnaboutfilm.com/making-a-film/exposure-explained/
https://www.exposureguide.com/exposure/
https://cinestillfilm.com/blogs/news/film-s-worst-enemies-7-common-film-issues
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