I think we need to set the baseline by defining/explaining exactly what these terminologies mean in terms of light anomalies we see in stock and modified DSLRs/MILCs. Lately I have come across some light anomalies myself, and have seen enough confusion in terms of injudicious use of such terms lately.... Here is my take to get the discussion started:
Amplifier (Amp) Glow (Referred to as Amp. Glow): Simply put it is sensor circuits emitting light when operating. I need more clarity and definition around it? Is it a thermal anomaly or a separate category?
Thermal Glow: This would be where sensor unevenly heats up with source inside the sensor or components around the sensor. Not sure if this needs to be separate category or merged with amp glow?
Light Leak (Technical): I would like we start using terms like leak and pollution differently to avoid confusion; take for example, I consider leak a leak when light is slipping in through openings, crevices around the sensor once default milieu around sensor gets disturbed in a modification. I consider it more of workmanship related deficiencies or breaches where brackets, framings, moldings, etc. around the sensor let the light in as default filter/s are removed and/or replaced.
Internal Pollution (Internal Light Source): I would like we start calling all light that makes it to sensor either directly or through filters that let it in. Take for example an LED around area whose light is otherwise blocked when all default filters are in place; remove those filters in a mod and sensor starts getting internally polluted. In this case it is not a leak technically in framing/molding around the sensor, just that light now has a straight path to sensor with filters not being there and light source being there all the time.
Another example of internal pollution would be a modified Canon where an exposure is invoked from within the LiveView; in such a scenario LED would internally pollute the sensor by being ON and default filters not being there to block it. So technically it is not a "leak"; it is an internal source polluting its own sensor.
Another internal pollution example would be a reader module LED that may pollute a modified camera.
External Pollution (External Light Source): This would be any light whose source is outside the camera; for example light polluting through the eyepiece, lens cap, etc. I would like we don't refer to this as a leak to preserve the concept of a (technical) leak defined above, and rather call it external pollution.
Reflections (Internal or External Light Sources): I hesitate to put this as a separate category here but a category nonetheless; this again would the result of disturbing the default milieu around sensor in a mod for example. I consider this an outcome of one of the above... for example a internal light pollution source may also be a source of secondary reflections. Or a leak causing secondary reflections.
Sensor Artifacts: Some manufacturing processes may create discernable oddities; stay tuned for examples in coming posts.
Other: Please add if I have missed any…
Edited by mmalik, 31 March 2017 - 02:05 AM.