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RF14-35 F4 not sharp at 35mm wide open

Started 3 months ago | Discussions thread
OBSERF8
OP OBSERF8 New Member • Posts: 6
Re: RF14-35 F4 not sharp at 35mm wide open

Thanks Abbott for your fine response. Yes I am aware of the rounded shape influence of the cola can and indeed tried the same test on flat surface with same result.  I would say that from about 70 cm ( 2-3 inches) the sharpness gets back to par with all other settings.
As the full open F4 at 35mm differs so clearly especially in the center from the other focal points wide open at close distance I just wonder if this was my  particular copy or a general property of the lens.  Hope to get some more response from people willing to test this or have the experience about it.   For close up shots from a leave , insect or many other subjects I tend to want to use 35mm F4 and must always think about stopping down . Not a big issue but I would have liked particularly the 35mm F4 super sharp wide open. 
Best regards,
OBSERF8

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