In my night-time tests on a black-and-white chart, which I've been making for at least a decade now, several scopes have tied for the highest brightness rating of 8. The test is set up to remove objective size from the factors.
How do you eliminate objective size from the factors affecting brightness? I can see equalizing the objective size where possible, but removal? Some of those Zeiss monsters are for all intents and purposes a spotting scope with an included reticle.
