I know Letus is guilty of this. And the Brevis footage I've seen is too. Is this just the cost of a 35mm adapter? Or is there a way to make them sharp on the edges?
M2 when hard mounted and the SGpro Rev.2-- the latter being the easiest to see in existing footage. Seems as though m2 users are just catching onto the hard-mount deal. I think the Brevis as well, but I'm sure of the other two.
Do a search for member: SOTTY and the threads her started in the HVX footage section. He's using Zeiss glass and another brand and getting some super sharp results with the M2/HVX and a Hard-Mount setup.
I've got the new CF1L (referred to as CF1e above) in my Brevis. No vignetting with longer lenses. A little vignetting with my 35mm (as predicted by Dennis at Cinevate), but not enough for me to bother switching the elements. I have had no issues with edge-to-edge sharpness, but I don't think I'm as strict about this as others.
SGpro, Brevis35, "M2" I put this in quotation marks because i find that the M2 tends to have a vingette that is pretty consistent though all the footage ive seen.
Alot of the time vinetting comes from or is compounded by the lense. i havent had vinetting with my m2 or brevis. i dont use zoom lenses, zooms have the most problems with it. Especially cheap ones.
You can reduce but never get rid of the soft edges - the only solution is to use better screens and zoom in on the image more - losing a large part of the point of 35mm.
The best suggeston is to increase your light levels. The physics behind 35mm adapters and the nature of apertures doesn't really provide a way to eliminate the 'hot spot' issue completely... Focus more on the quality of on set lighting and the speed / quality of your glass
you surely can eliminate soft edges. the trick is using a well crafter achromatic diopeter. Wayne kinney and Jim Lafferty both use a spectacular diopeter. The SGpro is pin sharp corner to corner as is the Go35pro. This is 90% of the reason i chose these adapters. the old SGpro rev1 has a Macro, and it suffered from soft edges.