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How do you Compensate for IR focal shift point on newer lens
I have a Tamron telemacro 70-210mm that has the IR focal shift dot on it, so I can figure out how to use it for IR photography. How do you find the focal shift point if the lens doesn't have the mark, or dot? I'm going to be using a Sony Alpha300, they say this camera should be well suited for IR photography.
Is there a list of lens that will work with IR photography? I don't want to spend the money on an IR filter only to find out the lens has a hot spot. The Tamron is noted for flair issues with normal light, but that doesn't necessarily mean that it will have issues with IR would it? I've heard of Zeiss lens flaring with IR because of the coating they use.
I was told to use what is called Hyperfocal Distance. I'll have to study up on this, and use the Tamron for IR until I can figure it out.
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