Why is Window Glass So Bad to Shoot Through?

Started 3 months ago | Questions thread
A Marcus Regular Member • Posts: 120
Re: Why is Window Glass So Bad to Shoot Through?

While the optical flatness of window glass is likely poor, that is not the real reason for your disappointment.

The glass window has two surfaces, both reflect light. This reflectivity induces flare light.  Flair is misdirected light rays that intermingle with the image forming rays. Flare will reduce the reduce the image contrast. Additionally, your camera is attempting to focus on the main object being imaged. Sometimes, this automation will be foiled and the camera sets the focus distance, not of the subject but on the glass window. Thus the sharpness of the key objects being imaged will be  compromised.

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