GH4 Newer .64x Speed Booster...

-griffy- said:
But photo/1080p on the XL version with the Sigma 18-35mm lens, is that a no-go? Anyone tried it yet or seen any examples to see if there's bad vignetting?
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The 18-35mm/1.8 & 0.71x Speedbooster combo vignettes in 4:3 stills mode. Don't remember if it vignettes in 3:2 stills but seem to recall it did.

Returned the lens so can't test further.
 
It seems like so much of the GH4 footage I have seen has the milky/grey look to it. Is this a feature of the camera or can one dial this out successfully? The footage in Dan C's review has this look to it.
 
-griffy- said:
So I'm getting close to pulling the trigger on a Speed Booster for my GH4 so I can start using some of my Canon primes again, but I'm also very interested in getting the Sigma 18-35mm f1.8, hopefully for use in both video AND photo.

So that brings me to my question: Speed Booster "S" or Speed Booster XL?

I'm fairly certain in 4k mode the Sigma lens would be fine on either Speed Booster. On the "S" version I believe it would be fine on photo mode/1080p video as well. But photo/1080p on the XL version with the Sigma 18-35mm lens, is that a no-go? Anyone tried it yet or seen any examples to see if there's bad vignetting?

I see that review in the post above me mentions using the Sigma lens, but they only really cover 4k video.
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Bassman2003 said:
It seems like so much of the GH4 footage I have seen has the milky/grey look to it. Is this a feature of the camera or can one dial this out successfully? The footage in Dan C's review has this look to it.
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Not to be a jerk, but I've been wondering the same thing. With 8 bit encoding (internal recording) I thought it was generally considered good practice to get the image correct the first time since there isn't a lot of latitude for corrections.
 
You are not being a jerk.

This thin milky look comes from not getting the exposure right and from the way a lot of folks are "dialing down" contrast and saturation. I don't get that look with mine, I have the color profile "Natural" selected and generally leave most of the parameters at the neutral "0" setting. I may dial the Sharpness down a notch or two. Here's what I get, you'll see no "thin milky gray" look in mine.

https://vimeo.com/98865311
 
With my "Lens Turbo", I've found that wide open is not as sharp as when using the lenses cleanest apeture. It seems to magnify any softness the lens already has at wide open.
 
Thanks Bruce. Looks better. Do you have any other clips or know of any good examples of the more saturated, sort of broadcast look?
 
Just watched some V-log footage from The Camera Store and it looks great. This update with the Speedbooster is peaking my interest for the GH4. Nice and vibrant.
 
Bassman2003 said:
Nice and vibrant.
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After you apply some kind of look to get it that way.

But is v-log still running 8 bit encoding? Won't this introduce banding when you "expand" it back into useable ranges? Are you better off exposing to the right and pressing the blacks and middle tones or exposing to the left and lifting the middle tones? (maybe I have the ettr and ettl backwards but the idea of the question should transfer)
 
ETTR is often preferable for Log recording as it suppresses noise, but at the expense of highlight roll-off, & potential clipping.

It's common to overexpose Log in low light in order to dig into the shadows, but underexpose in bright light with hard highlights to enhance roll-off & avoid clipping.

There's more going on under the hood then numbers reveal & only real world tests will show how well Log will perform with the GH4's 8-bit internal recording. I imagine 4K properly down-sampled to HD may be fine as it appears to be smoother then 8-bit.
 
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