Godox and HSS at fast speeds on EM1 II ??

Mack

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There's some oddity I found with the Godox and HSS on E-M1 II.

I set the ISO to 200 (Recommended) and put a Godox speedlight (e.g. Either a TT-685 or TT-350 for Olympus) in the hot shoe, but there is an odd shutter speed that comes into play and changes from 1/50 down to even slower 1/20 with an increase in the ISO.

Example: ISO 200, Godox HSS Sync (i.e. Lightning bolt) on the flash is ON, with the Anti-Shock or mechanical shutter ON (Diamond) I can go from 1 second up to 1/8000 second - no problem.

Changing from Anti-Shock/mechanical into Silent/electronic shutter (Heart) I can go up to the fastest maximum of 1/32,000 second. No problem there either.

So far all is normal.

However, with the above still set the same: i.e. ISO 200, Silent/electronic (Heart), HSS SYNC lightning bolt on Godox LCD is still ON, and 1/32,000 sec. shutter still set, if I just turn OFF the Sync (HSS) on the Godox itself the camera's speed immediately drops from 1/32,000 way down to 1/50 second, or much slower than the mechanical sync speed of 1/250 second. Odd?

Now increasing the ISO up from the recommend ISO 200 to ISO 8000 the shutter speed drops even slower to 1/20 second at ISO 8000 and higher. I would think shutter should go faster, but it goes even slower? :confused-53:

Exact same thing on E-M1X also. Going higher ISO makes camera shutter go slower (1/50 to 1/20 sec.).

This has to be something to do with the fully open scan speed of the Silent shutter, but why it goes opposite (to an even slower shutter) with the increase in ISO seems odd. My thoughts are the really fast speeds in Silent from 1/8000 to 1/32,000 must be on the order of 1/50 second for the fully open scan time to sync with electronic flash, i.e. X-sync with electronic shutter is only 1/50 second with those fastest speeds?

I looked for some info on HSS in the Darrell Young book on "Mastering the Olympus OM-D E-M1-Mark II" and he is mum on the subject.
 
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JonSnih

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There's some oddity I found with the Godox and HSS on E-M1 II.
There is a limit for flash sync with e-shutter because of banding. From the E-M1iii manual:
1631728642108.png
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The next thing. A camera has to be in M/S mode (I have never used S mode). This is the only way how to set the shutter speed (HSS) at your wish. In A mode the camera sets the shutter speed accordingly to an ambient light available (slow(2)/second curtain shutter) or is set by the item menu called minimum flash sync [see bellow] for the first curtain shutter (fill in).

1631729045062.png
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1631729471729.png
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Mack

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Thanks JonSnih. :th_salute:

That info is what I was looking for when I inquired what the sync or open time was for the highest speeds. I don't have the E-M1 Mark II manual, but did see it in see it in the E-M1X manual I have and might be a bit more info given the E-M1X manual is almost 700 pages.

I was hoping the Silent or Electronic shutter's X-sync speed was much better than 1/50, or even 1/20 second in worse case. Maybe 1/100 or faster. Oh well....
 

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