Thanks for the great review. I have the Fuji X-T1 and X-E1. I love the system, but after a recent trip to Vietnam and many missed shots, I did some testing. I have tried to get this confirmed by a number of sources, but no one seems willing to spend the few minutes to check. Up for the challenge?...
What I have found is this, depending on lens, the time it takes to 'grab' a shot is quite variable. We all know that focussing speed is not the fastest on the X-series cameras, I generally shoot in manual focus, and what I am talking about is when raising the camera to my eye, in manual focus, and pressing the shutter button, you know, to grab that once in a life time shot of a child's expression for example, I sometimes miss that moment.
What I see is that depending on the lens and aperture selected, the time for the camera to complete the shot can really vary. The worst I have found is with the 56mm 1.2. If the aperture is set wide open, shutter response is almost instantaneous. But, if I set an aperture stopped down, the time for the blades to close and the camera to fire gets progressively longer, maybe more than 0.5 seconds at F16. This can actually be perceived audibly, if you listen to the lens on half-pressing the shutter button, you can actually hear the aperture blades closing and opening, whereas wide-open, of course no movement sound. It can be perceived visually by looking through the EVF, and when at say F16, as the shutter button is half-pressed, when the aperture is being stopped down, the EVF image freezes momentarily. It is this delay that is causing me to miss shots.
So, do I have a lemon, or is this inherent in the design.
I did two tests, both with ISO set to 800, manual shutter speed at 1/60th, lens cap on, and manual focus. I then set two different apertures, wide open and F16, and tried to fully depress and release the shutter as many times as I could in 15 seconds, and the results: -
Test 1 - F1.2 Wide Open - 30 complete shutter button press/release cycles
Test 2 - F16 - 15 complete shutter button press/release cycles
Okay, not scientific by any means, but backs up what I am seeing and hearing in terms of aperture blade movement, whereby the time it takes to close down the aperture to anything other than wide-open is quite a substantial delay. I am an experienced SLR shooter, and I experience nothing of this delay with my Nikons, which by way of example in the same tests, show no difference between wide open and stopped down shooting. A cheap Nikon 5200 can do 60 presses in 15 seconds, and my D700, even more... Even my mechanical FE2 fires instantaneously in comparison...
If there is any chance at all you can or have already done this sort of test, just to confirm I am not going mad, that would be great to know. I realise doing one of tests like this is not really your mainstay, but might be an interesting test to include in your performance criteria, i.e. the time delay needed to firing a shot in manual focus, both wide open versus stopped-down.
If there is any chance you have the time to repeat my tests shown above, that would help me greatly, helping me to establish whether I have a bad lens, or if the Fuji system of aperture closing just plain slow?