Thanks for the response Gregge..it's nice when one can have an intelligent discussion about a subject. So you are saying it is the optics that are changing the brightness, not the TD!...that sort of proves my point. I would still say....using the same lense, keeping the image the same size, and...
Sorry Gregg....my statement is absolutely correct. This has nothing to do with the lens, and everything to do with physics. Light does not diminish over distance, only by divergence. That is not to say that different lenses may not affect light in different ways. If the same lense is used...
I know this is an old post, but a a note of clarafication is in order, because it keeps popping up here every once in a while. I don't know why it seems to be hard for some people to understand.
The throw distance, has no bearing on the brightness of the image, it is the size of the image, that...