flash sync for GX100?

Answers on Frequently Asked GX100 Questions

flash sync for GX100?

Postby lucridders » Mon Nov 12, 2007 10:17 pm

What is the flash synchronisation for the GX100. Can anybody give me the correct value as foreseen from the factory out? Further, what system is Ricoh using for the aperture? A diafragpm system or a blade system that is moving up and down?
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Re: flash sync for GX100?

Postby lucridders » Tue Nov 20, 2007 12:11 pm

So, I know now from Ricoh what I discovered already by myselves by doing testshots and by examing hem in a colordensity scanner. The flash syncro speed is 1/125 and the diafragma is a circular bladed one. When you ry the correct setting in manual mode at 1/125 with the flash, you will see that you have quite good pictures. I was reading hat it was able to sync even at 1/2000 in some forums, so is quite stupid as you will never had balanced lighting on he picture this way. So, in fact you can not use the build in flash in a good way in automode.
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Re: flash sync for GX100?

Postby htgx100 » Wed Dec 05, 2007 11:15 am

lucridders wrote:So, I know now from Ricoh what I discovered already by myselves by doing testshots and by examing hem in a colordensity scanner. The flash syncro speed is 1/125 and the diafragma is a circular bladed one. When you ry the correct setting in manual mode at 1/125 with the flash, you will see that you have quite good pictures.


I've verified that the GX100 can sync at 1/2000, tested with the built-in flash and external flash directly in the hotshoe or extended on a cord. I haven't tried the wireless triggers, although I've heard some of them only sync up to 1/125.

lucridders wrote:I was reading hat it was able to sync even at 1/2000 in some forums, so is quite stupid as you will never had balanced lighting on he picture this way.


1/2000 is actually quite useful for daylight fill. The higher a shutter's real sync, the less flash power needed since you are able to use a wider aperture. Not only does this allow greater flash distance and shorter recycle time, but the larger aperture gives better optical performance in these little lenses which begin to suffer from diffraction as early as f/5.6. In the case of the GX100, the "Sunny 16" rule at ISO 100 and 1/2000s gives an aperture of f/4 - right in the ballpark of the lens' best optical performance at wide angle.
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