XF 56mm APD vs. XF 56mm

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XF 56mm APD vs. XF 56mm

by Rico Pfirstinger

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Fuji X Secrets Workshops – Rico’s Flickr Sets

Istanbul Calling – XF 56mm vs. XF 56mm APD Sample Images

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^ Istanbul (X-E2 with 18-55mm kit zoom, SOOC JPEG Velvia)

Happy New Year everybody!

I hope you’ve successfully navigated through the sometimes stressful holiday season. I certainly did, and now we don’t have time to waste, as new Fuji product announcements are just around the corner. Not to mention that I’m supposed to submit the English and German manuscripts of my book on the X-T1 in less than two weeks. The book (which will be available as an ebook and eventually also in print) will incorporate all changes and new features of the big firmware 3.00 update from 18DEC.

^ Istanbul (X-T1 with 18-135mm kit zoom, Lightroom)

But wait, there’s more: Fuji X Secrets is going to Istanbul, a marvelous city for photographers of all genres. From 30APR to 5MAY, an exclusive group of only 5 to 7 Fuji X series fans will be able to explore this mesmerizing city along with Fuji X-Photographer Mehrdad Abedi and myself. Mehrdad’s stunning work as a travel photographer earned him the title story in a recent Fuji X Magazine edition, so check-out his portfolio here, and also have a closer look at what’s in store for you during this one-time event, which will be conducted in German language. As of today, three spots have already been taken.

^ Fuji X Secrets Workshop in Schwabach, 3OCT14 (X-T1 & XF56mmF1.2 R, Lightroom)

For those of you who want to stay closer to my current home in Germany, I am also offering a new Fuji X Secrets weekend workshop here in Nuremberg/Schwabach on 11 and 12APR. Two of only four available spots are currently available.

^ Santa Barbara (X-T1 with 18-135mm kit zoom, Lightroom)

If you are interested in an English language Fuji X Secrets workshop this summer (July) in Southern California (Santa Barbara area), please drop me a note at info@fuji-x-secrets.com, so I can keep you informed.

^ XF 56mm F1.2 R APD

Since Fuji is about to officially announce another high-end lens tomorrow, let’s use the build-up for a comparative look at Fuji’s new XF56mmF1.2 R APD lens. As many of you will remember, this lens was on display in September at the Photokina show in Cologne, and it appears that its announcement led to a few misunderstandings.

Let’s be clear: The APD version is not replacing or succeeding the regular XF56mmF1.2 R lens. It’s not even considered an improvement. It’s just, well, different. It presents itself as an option for a small niche of photographers who shoot portraits at wide-open aperture and want very smooth bokeh. Here in Germany, Fujifilm considered this niche as being so special that they didn’t even order pre-production samples of the APD for media previews or sales presentations to dealerships. Hence also the delay in my reporting.

^ X-T1, XF56mmF1.2 R APD, Lightroom

But better late than never. I’ve spent the holidays comparing a fresh production sample of the XF 56mm F1.2 R APD with my trusted regular XF 56mm lens.

So What?

To begin with, let’s establish what the APD (apodization) filter is actually doing. The non-removable filter is installed in the same optical plane as the aperture, so its effect is actually quite similar to closing the aperture of the lens: It reduces the amount of light that reaches the sensor, and it also reduces out-of-focus blur. So what’s the big difference to the actual aperture? Simple: Actual aperture blades features hard edges, while the APD filter uses a soft gradient (like a radial neutral density filter) that brightens from the corners towards the center of the image circle. This smooth gradient has a softening effect on out-of-focus areas: the blur discs are smoothed down. This effect decreases as the lens is stopped down, and at apertures of f/5.6 and smaller, the APD filter has no effect at all.

This means that the APD filter offers its maximum impact wide-open at f/1.2. Stopping down the lens (the actual aperture) obscures more and more of the APD filter’s neutral density gradient until there’s no effect at all at f/5.6. That’s why Fuji recommends using the XF56mmF1.2 R APD between f/1.2 and f/2 for the filter to have a visible impact.

In order to clearly see the difference between a regular 56mm lens and one with an apodization filter, it’s best so take a picture that consists of nothing else but blur discs. After all, this is where the APD filter is supposed wo work its magic, right? So I did just that, taking deliberately defocused shots of a corny christmas light installation in my neighbor’s garden. Here’s what it looked like with my regular 56mm lens:

^ XF56mmF1.2 R @ f/1.2, SOOC JPEG Provia

And here’s the same subject shot with the APD version:

^ XF56mmF1.2 R APD @ f/1.2, SOOC JPEG Provia

I think that this example illustrates pretty clearly what the apodization filter is doing: It’s smoothly shaving the edges off those blur discs.

It’s good to know that the APD filter affects blur discs of all sizes (and hence any defocus level), as you can see for yourself in my sample gallery on Flickr.

To illustrate this point, here’s another comparison, this time with less defocus and hence much smaller blur discs:

^ XF56mmF1.2 R @ f/1.2, SOOC JPEG Provia

^ XF56mmF1.2 R APD @ f/1.2, SOOC JPEG Provia

Again, the APD version displays smoothly shaved-off blur discs, which is exactly the effect that users of this lens are looking for. It also means that the APD filter affects all areas of an image that are out-of-focus. On the other hand, in-focus areas are rendered just as sharp as with the regular 56mm lens.

Get Real!

That’s nice, but what about more realistic subjects? To make a comparison, I set up a situation in my living room, manually focusing with both lenses on a candle and shooting this subject at apertures between f/1.2 and f/5.6. Here are the results wide open at f/1.2:

^ XF56mmF1.2 R @ f/1.2, SOOC JPEG Provia

^ XF56mmF1.2 R APD @ f/1.2, SOOC JPEG Provia

In this more realistic example, the differences between the two lenses are less pronounced. We can see that the regular lens leads to a blurrier background (just compare the extent of the blur in the chair’s armrest). However, the APD version is smoothening the blur by softening the edges of the blur discs, so overlapping blur discs result in a less busy bokeh.

Closing down the aperture gradually reduces this smoothening effect, as you can see by clicking through the remaining samples of this scene.

At f/5.6, there’s virtually no difference between the regular and the APD version:

^ XF56mmF1.2 R @ f/5.6, SOOC JPEG Provia

^ XF56mmF1.2 R APD @ f/5.6, SOOC JPEG Provia

Even if the improvement may seem marginal: any improvement is an improvement, right? So why not dump the regular XF 56mm lens and replace it with the (seemingly better) APD version?

It’s not that easy, because the APD filter introduces shortcomings of its on:

  • The brightness of the lens is reduced between f/1.2 and f/5.6. For example, setting the APD lens to f/1.2 results in an effective lens speed of f/1.7. Since the APD lens is slower, shooting wide-open in poor light requires slower shutter speeds and/or higher ISO settings. At least you don’t have to guess, as the effective aperture is shown by red markings on the aperture ring.
  • The APD filter also has a negative impact on autofocus performance. Fast PDAF (phase detection AF) is not available at all, and CDAF (contrast detection AF) performance is reduced in poor light along with the decreased lens brightness.
  • The APD version is significantly more expensive than the regular version, so you basically have to pay more for less performance. For the APD version to be a reasonable choice, you really, really have to love its softened out-of-focus blur at wide-open aperture.
A Little Shootout

To make things easier for us, I used both lenses to shoot a handful of real-world samples in the field. Look at the examples and ask yourself whether the differences are strong enough to justify the extra expense. All examples were shot wide-open (f/1.2 setting) and processed with Lightroom 5.7 (each pair with identical settings and brightness/exposure & white balance equalization).

First, let’s look at a typical bokeh killer: leafless trees and branches lurking in the out-of-focus background. It’s a no-no for portraits, but people seem to shoot such situations, anyway, and I remember reading heated complaints about “busy backgrounds with branches” when the original 56mm was released almost a year ago. So I wondered: Is the APD lens an actual remedy for this issue, or is it just wishful thinking? See for yourself:

^ XF 56mm F1.2 R

^ XF 56mm F1.2 R APD

I’ll let you be the judge of what the APD filter can (or can’t) do for you.

The next example features a calmer and more distant background, but with a twist, as I also included two small pillars in the shot that are much less out of focus. I wanted to see how the APD filter affects different kinds of blur:

^ XF 56mm F1.2 R

^ XF 56mm F1.2 R APD

As expected, the background blur is less pronounced (but smoother) in the APD version. This is no surprise, as the APD filter acts like an aperture with soft, semi-transparent edges.

Here’s another example that shows both front and back bokeh with less blur than in previous shots:

^ XF 56mm F1.2 R

^ XF 56mm F1.2 R APD

It might be interesting to note that in a blind test, some observers preferred the regular version of this scene due to its better subject separation and increased blur both in the foreground and background. It seems that at least to some, the negative APD effect (basically a slight increase in depth-of-field due to the APD filter’s nature as a pseudo-aperture) outweighs the increased smoothness of the APD filter.

My final example illustrates the opposite situation: a close-up with great subject separation and pronounced blur discs (thanks to the backlight situation):

^ XF 56mm F1.2 R

^ XF 56mm F1.2 R APD

Here, the difference between the lenses is quite visible, but that doesn’t mean that everybody will prefer the softened look of the APD lens. Some may prefer the larger, more vivid blur discs of the regular lens.

I have a few more direct comparison examples for you in my Flickr album, simply click here to have a look.

It’s Up To You!

I’m glad I made this comparison, as it pretty much showed me what to expect from both versions of the XF 56mm lens. Performance-wise, the regular 56mm lens with its “real” f/1.2 aperture and fast PDAF is the winner, but I can certainly imagine myself using the APD version for wide-open portrait shots that don’t require maximum AF performance. Face detection works equally well with both lenses (as it’s CDAF-based, anyway).

What’s Next?

Tomorrow, we’ll take a brief First Look at the new XF16-55mmF2.8 R LM WR zoom lens.

X-T1, XF50-140mmF2.8 R LM OIS WR, Lightroom

For your convenience, here’s a TOC with links to my previous X-PERT CORNER articles:

Rico Pfirstinger studied communications and has been working as journalist, publicist, and photographer since the mid-80s. He has written a number of books on topics as diverse as Adobe PageMaker and sled dogs, and produced a beautiful book of photographs titled Huskies in Action (German version). He has spent time working as the head of a department with the German Burda-Publishing Company and served as chief editor for a winter sports website. After eight years as a freelance film critic and entertainment writer in Los Angeles, Rico now lives in Germany and devotes his time to digital photography and compact camera systems. His new ebook The Fujifilm X-E2: Beyond the Manual is available at Rocky Nook.

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