FS7: Clear Image Zoom?

Basically I use CS on stuff that I'm not fussed about and will never see again. it's one of those 'good enough' features which is quite handy but which I'd never use on something primo.
 
I just shot a small segment using CS yesterday on my FS7 w/ Sigma lens. There is definitely a degrading in the sharpness when using it. Viewing slog3cine in my viewfinder, with peaking on - it became very obvious when trying to nail focus. But - it was still a usable shot. I was probably at f4.... not so sure I would try it up around f2.

I'd suspect the Sigma before dousing the FS7 center scan. I've used it successfully but only with my Nikon glass. Seemed fine, though I'm not doing big screen or effects work. Certainly no worse than using an HD ENG lens with the doubler in on an F800, IMO!
 
Its less than full HD res.. due to de bayer..thats the beauty of the Fs7/F5 always shooting off a 4K sensor to achieve HD.. but equally the 4K could be argued to not be 4K res after debayer.. I think the rule of thumb is about 25% loss.. 6K becomes about 4.5K
 
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