STOP! Do not cut the Lens Hood out first. Note, it has a flower petal
type hood with the longer petal on the top & bottom.
It's these longer ones that causes the vignetting.
Try twisting it to the LH / RH position from the top. Take shots and
see the results.

If it won't budge (after you have tried both the CCW & CW twist), mark
the top & bottom petals to follow the petal shape. Now use the smaller
1/4 inch hack saw blade without the handle.
Check the photo. Go on cutting by trial and error.
Make sure you don't graze the lens. Stick a 3M Post It on the Lens as
protection.
Then use emery paper to smoothen the rough cut surface.

If the LH / RH vertical petals are the culprit too, mark and cut with
the hack saw.

Good Luck.
Bipin

There is nothing worse than a sharp image of a fuzzy concept -  Ansel Adams

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