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Yes, the diff spikes from the lens aperture blades do show up. I usually stop down a little and don't use wide open. But if you're starting with a faster lens, you can stop down to the equivalent wide open of slower lenses. Plus if I'm using a smaller sensor than FF 5DII, that should take out any residual edge issues, since sensor more in the middle of light path. That's my thinking, anyway.
Tried stop-down rings once before with FF 5DII and got vignetting. I put it down to external apertures being on front of lens, not where they should be at the aperture blade distance.
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