Hi Winsor:
> So if I understand you correctly, a well designed 300/f4.5 with a little
> low dispersion glass will correct for chromatic aberration as well a faster
> APO design with ultra low dispersion glass. The design of the lens, like
> other design, is using materials appropriate to the task.
Yup. I'd say you have it down. For a 300mm, an f/5.6 design doesn't need
expensive glass, so you could have an APO design at a relatively low cost.
Gary Reese
Las Vegas, NV
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