Fujifilm has two versions of the their 56mm lens, the regular Fujinon XF 56mm f/1.2R and the Fujinon XF 56mm f/1.2R
APD, one that has an internal apodization (APD) filter. Before I get into the technical lens details, let me mention that you'll see a number of animated GIFs in this blog posting that are comparisons between those two lenses wide open at f/1.2. Note that GIFs only have 256 colours in total and are dithered to allow them to display a 24-bit colour image. This dithering can be visible as some roughness or even slight banding in these animations. Also, for those who just want to dive in and look at images, here is a link to the full gallery with all the photos mentioned in this posting, each carefully shot at seven different f-stops with both lenses - 70 images in total!
Gallery:
Fujifilm's Fifty-Sixes Compared! The APD Effect…
I chose to test the lenses at third-stops from f/1.2 to f/2 and then go right to f/2.8 and finally f/4 since the effect becomes so minimal once you stop down past f/2.0. The photos in the sample gallery were all shot on a tripod, with the two 56mm lenses changed carefully as to not move the camera. For some reason, I did notice a hint of movement on some sets that was likely my forgetting to sufficiently tighten the panning-lock on my ball-head, however, there was definitely a distinctly different "aim" to both 56mm lenses, something I found a bit unusual. Even though the shift was only slight, it was bothersome enough that on all the photo groups, I carefully cropped them ever so slightly, then nudged the crop frames around until I got the best superposition of the regular set with the APD set. While this was rather tedious, luckily Lightroom made it fairly painless. Once I had the f/1.2 versions aligned, I could just sync the crop settings on each group of smaller f-stops.
In order to show some of the bokeh effects more obviously, I heavily cropped two sets in the gallery, namely photos 15-28 and 57-70. On those, the frame you see is roughly a third the area of the whole field-of-view. All the others only have a tiny bit of cropping, just enough so I could achieve perfect alignment of each set of shots, well almost perfect at least. Lastly, there was some movement of branches due to wind, especially in photos 43-56.
For some less technical and more aesthetic samples, see this blog posting from a week earlier...
Post:
Nicole with the Fujifilm XF 56mm f/1.2R APD
So, now for some details of what makes Fujifilm's 56mm APD lens (almost) unique...