Light leak on ND filter

Soldato
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Is it possible for the viewfinder on an A73 to cause a circular light leak when using a 10 stop ND? I won't have the time or opportunity to test this until the weekend so was wondering if anybody has ever experienced this?

If it's not the above I'm wondering whether I need to change the P series holder I'm using for the Cokin Evo version. If it isn't the view finder that's causing the issue I was wondering whether it could be the gap on the guides that the 84mm filter slides in to?
 
Soldato
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Not a chance, especially on a mirrorless camera. It’ll be the Cokin holder.
I'll order the Evo then unless anybody is aware of an alternative that will take a 67mm lens adapter and still be compatible with a square Cokin 84mm piece of glass?
 

And

And

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Are 84mm filters suitable for full frame or are they meant for APSC/m43?
 
Soldato
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Are 84mm filters suitable for full frame or are they meant for APSC/m43?

I haven't had any issues with my other 84mm filters only the ND1000

Edit:
The P-series holder will work with Full-Frame lens focal lengths 24mm and greater. If you use the holder on a lens that is wider than 24mm there is a very good chance that you will see the holder in the corners of your pictures, This is also called a vignette or vignetting. It is also possible that you will experience vignetting even at 24mm if the holder is rotated off center axis. We recommend you look at Cokin’s larger filter systems, the Cokin Z-pro or X-pro, if you plan to use lenses wider than 24mm.
 
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