Looks very good to me Doug. You will find that the the micron size of your detector will show the slightest fault in the image train. A zoom lens by having a moveable bit in the middle will never be 'square'. It is the old story of compromise. Do you have versatilty or self imposed 'perfection' with no room to move. You choose!
I have a 300mm lens that costs 7K+ new and it is still shown to be wanting!
Just keep taking images. At least you have something in your hot little hands. The naysayers have nothing. This of course excludes Jase as his advice is well worth listening to.
Bert
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