Nissin kindly sent me one of their much talked-about flashes – the i40 – to test out. I plan to write a full review of the flash in mid-February but before then I just wanted to share my initial thoughts. This is only going to be brief as I wanted to get this up as soon as possible as I know a lot of people are interested in this Flash for the X-Series.
Unboxing
Straight out of the box it is very nicely presented, coming with a great little case, a stand and even a diffuser (not always the case with other manufacturers).
Usage
So what else is there to do when you get a new flash and live seemingly in the middle of nowhere…. Selfies obviously! I set up the X100s with the TCL-X100 attached on a tripod and had the i40 flash on a light stand with a little softbox attached. The camera and flash were connected by a TTL (through the lens metering) cable so allowing TTL. I moved the flash around a little bit and I’m pretty impressed with the flash (the same can’t be said for the model, what’s up with the constant smirk!).
The first image was taken with the camera exposure compensation set at 0ev. With the flash to the left of the camera and slightly higher. 
The next two images were taken with the camera exposure compensation set at -1ev. You can see that the background is much darker compared to the above images. 
For this image the flash was moved closer to the camera and a little higher so the flash was falling straight down onto my face. 
Conclusion
As mentioned before, I will put together a more comprehensive review of the flash in mid-February once I am back from Romania, where I will be putting this little flash through it’s paces, photographing an Ice Hotel for Untravelled Paths.
Until then I have to say that I am very happy with this small but powerful flash. It looks a great addition to the X-Series with the flash balancing well with the cameras.
Where to buy
Click here to see retailers selling the Nissin i40 Fujifilm fit
Why buy it when the Fuji flash is cheaper ?
I look forward to your full review. What i would like to read about, is build quality, recycle time & battery longevity. Keep up the good work.