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Stuart,
Your basicaly shooting a very small image, and thats the GG image, about the size of a post stamp and so close to your lens, this makes it normal to use macro. Engaging it fully can not only give you a better image, but also it locks down the variable to just your zoom to fix when setting up.
Ive been in your path around two years now so i had to contend with a lot of trial and error.
In your setup photo, is there a step down ring threaded on your fujinon filter thread? if so, try removing this, i assume its an 82-72 step down ring, after removing it push the achromat deeper into your front lens. You could get better results.
Thats how i set up mine. The achromat is pushed closer to the front glass element of the fujinon. -in fact i went further and removed the anti glare ring, its that round plastic inside your focus barrel at seem to look like a series of terraced rings, its just threaded there, removing it widens the front opening and allowing the achromat to get real close to the front glass element. This improved my edge to edge sharpness in my set up.
Ted
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