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Yes Mike it is optically almost as good as my Canon 300mm F2.8L even wide open at F2.8. You really have to zoom right in to pixel levels and then you can see a marginal difference. The great advantage with this it will work with any camera or astro CCD as it is fully manual. The front lens has a diameter of 105mm. You are correct, this is a seriously good lens. You could say it is a 105mm Diameter F2.8 APO. It has no chromatic abberation and is pinpoint sharp over a 20D sensor to the corner. I have not tried it yet on the 5DH.
This is the lens that will be available for loan to IIS members. I am trying to make it as universal and easy to use as possible.
Bert
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