GH5 GH5 with Metabones Speedbooster and Rokinon Primes

H

Hugh DiMauro

Well-known member
Dear Forum:

I noticed a peculiar behavior in my GH5. When I installed a 50mm Rokinon prime with Metabones speedbooster and turned on the camera, a pop up message asked if my lens was a 50mm. I clicked yes and was off and running. It would do this every time I turned on my camera. No big deal. When I installed my 28mm Rokinon lens the camera didn't ask me if I wanted to use the new lens the way it asked about the 50mm. Everything seems to work fine however. Any ideas on why the camera asked about the 50mm and not the 28mm?
 
Yeah 50mm is the default setting for image stabilization. You set the focal length of your lens so it can better adjust the IS. With the IS on it will ask you what focal length you are running with each power-up, but should revert to the last mm setting. Turn off the IS and the message will go away. If you're using a speedbooster multiply your focal length by .71 to adjust for the booster.
 
I'll be damned! That's probably why I never saw the message again, even when I changed lenses! Because I shut off the image stabilization but didn't do it for any other reason than... I just don't use it! Thanks a million. I am grateful for your assistance. May I pose another question? Why, when using my speedbooster and Rokinon clickless primes, do I not get any F stop readout in the viewfinder? It just stays at "0" when I adjust the lens aperture? Is this normal? Shouldn't I get some sort of readout? I can only judge exposure through zebras and waveform. Any thoughts on the matter?
 
Hugh DiMauro said:
Why, when using my speedbooster and Rokinon clickless primes, do I not get any F stop readout in the viewfinder? It just stays at "0" when I adjust the lens aperture? Is this normal? Shouldn't I get some sort of readout? I can only judge exposure through zebras and waveform. Any thoughts on the matter?
Click to expand...

Aperture values are communicated to the camera through a lens' electrical contacts. The Rokinons have no electronic components so, no information.
 
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