kli
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Veteran Member
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Posts: 4,587
Re: Godox V860IIs or TT350s
WhiteVsBlack wrote:
Maybe question will be stupi, but:
V860II - GN60/ISO100-200mm
TT350 - GN36/ISO100-105mm
You're misreading a bit.
The guide number is given as a distance; so whether it's in feet or meters matters. And that distance is for the flash at a given combination of zoom setting and ISO setting when used at full power. If you take the guide number and divide it by the f-number of the aperture setting you're using, that's how far away a subject can be and still be properly illuminated by the flash.
Given that they're going with lowest iso, highest zoom, and highest power setting, this is the absolute limit of what your flash can do.
So, the numbers are:
V860II - GN 60m @ISO 100, zoom 200mm.
TT350 - GN 36m @ISO 100, zoom 105mm.
More realistically, it's probably going to be about half to two thirds that number in use, because you won't be zoomed in all the time. Zoom on a flash is basically how far forward/back the flash tube in the head is in order to control the spread of light. Zooming all the way in puts the tube all the way back to give the tightest, most focused beam possible, which looks the most powerful, so a lot of manufactures put the GN spec in that arena. In reality, at 35mm zoom, that V860II's guide number will probably be between 35-40 meters.
So, yes. This is a BIG difference.
The V860II is a full-sized speedlight, that runs off a Li-Ion battery pack with the capacity of roughly 3 sets of 4xAAs in it. The TT350 is a mini-flash for mirrorless that runs off 2xAA batteries. The V860II not only can pump out a lot more light per flash, but can do up to 600+ full power bursts off one pack before needing a new one, while the TT350 can only do about 200+ full power bursts before needing a new set of batteries. It's much less powerful.
And power with a flash is like max. aperture with a lens: the more you have, the more you can do.
Or maybe other propositions for sony A7II? TTL+HSS is a must have.
Question is whether you plan to use the flash on-camera or off-camera and whether you just need it for fill or as your main source of illumination. On-camera, a big full-sized flash is likely to be unwieldy and top-heavy. A smaller unit is likely to balance better.
The other TTL/HSS main contender for Sony mirrorless would probably be the Nissin i60.