Here’s a 12-minute video in which photographer Steve Perry shows how to use the relatively new “Auto AF Fine Tune” feature from Nikon. If your camera is back or forward focusing, then it’s. AF tuning is not recommended in most situations and may interfere with normal focus; use only when required. Service note: If your lens has a focus problem you should return it to Nikon Service as AF Fine-Tune is not intended to solve optical problems which will generally be outside of scope for this tool.
When we finally pluck up the courage to purchase an expensive lens, we expect them to be perfect right? Unfortunately, no matter how good the lens is, there are always going to be minor differences when we attach it to our specific camera.
Often our camera bodies are made at a completely different time and usually in a completely different factory, so when we finally bring the two together there are often minor adjustments that we the user have to make to ensure we’re getting the best image possible from that specific lens.
Often our camera bodies are made at a completely different time and usually in a completely different factory, so when we finally bring the two together there are often minor adjustments that we the user have to make to ensure we’re getting the best image possible from that specific lens.
So regardless of whether our lens is new or old, or if our camera body is new or old, many will say fine-tuning your lens to your camera body is crucial.
How to Calibrate your Lens
Thankfully calibrating your lens isn’t difficult and if you’re going to do all of your lenses at the same time, it shouldn’t take more than a couple of hours to do them all. It’s worth pointing out now that this process is really to calibrate the autofocus on your camera to the desired lens and will not fix ‘soft’ focus lenses in any way. If your lens is soft when you manual focus with it, this process will not improve it.
What You Will Need
- Sturdy tripod
- Focus chart or ruler
- Software to review results
- Patience of a saint
Set your tripod and camera up at the same height as your chart or ruler and make sure the camera is level. Use a spirit level (usually on most tripods) if necessary.
Setting up Your Chart
Next, you’ll need to set up your focus chart. Although there are plenty of places online where you can download and print out focus charts, I personally don’t feel it’s all that necessary. I used a metal ruler that I had in the drawer and that seemed to work for me. In fact, you could just as easily use some packaging that has a lot of text on it.
The real trick here is to mount the focus chart/ruler at an angle so you can see the focus drop off. You just need to have a specific point to focus on and then other areas of detail around it to see where the actual focus is falling. As I said, I used a metal ruler as I could focus on a specific measurement number and then check what was in or out of focus around it.
I mounted mine on a stand at a downward angle and focused my camera halfway along the ruler.
Setting Up Your Camera and Tripod
Next up we’ll need to make a few adjustments on our camera setup and settings.
First, you’ll need to place your camera and selected lens at the appropriate distance from the ruler. This distance is dependent on the focal length of the lens you’re calibrating and the easiest thing to do is check the details on this super handy chart from LensAlign. Their Distance Tool allows you to input your camera sensor size, your focal length and minimum aperture and it’ll give you the optimum distance you’ll need to do the test. Input your numbers and then set up your camera at the appropriate distance as recommends by the site.
Camera Settings
You’ll want to set your aperture to the smallest your lens will allow. For example, in this instance, I was calibrating my 50mm f/1.4 lens so I set my camera’s aperture to f1.4. Make sure you have adequate ambient lighting and that you’re shooting at a fast shutter speed to capture a very crisp image to avoid minor movement throwing off the focus adjustments. I had my ISO at 1600 as the noise wasn’t a concern because I wasn’t interested in printing these out.
Next, you’ll want to switch to live-view to enable you to zoom in and really nail the focus. It’s my recommendation that you should select the center focus point as well as choose the smallest focal point possible.
Once all that is done, it’s time to zoom in and focus on the center of the ruler and take a shot. Again, my advice would be to take at least three shots here so that you can get a broader look at the autofocus. Each time de-focus the image and then refocus again to test the autofocus properly.
Importing and Checking your Images
All that’s left to do now is import your photos into editing software like Lightroom or Capture One. Importing your photos into an image capture software enables us to zoom in a lot further than on the back of a camera. Remember that the image on the back of your camera is a JPEG so zooming in a long way can make the image appear fuzzy, whereas importing them into software like Lightroom allows us to check the focus point accurately. Once you have imported your photos, zoom into the image so that the focus point is filling the frame. Now we can assess whether there is any fine tuning to be made with our autofocus.
Pro tip: Sometimes it can be hard to distinguish what is in focus and what isn’t, so a good trick can be to use the color picker and see what colors appear in the focal range. For example, most lenses will have aberrations and those aberrations are consistent in a digital file. Areas that are out of focus behind the focal point tend to have a green hue to them, and areas that are out of focus in front the focal point tend to have a magenta hue to them.
Making the Corrections
First off we’ll need to bring up our AF-Fine tune to turn it on and make the adjustments. This is the Nikon menus but the other cameras use a very similar name and process. For a Nikon DSLR, go to the menu with spanner icon and in there at the bottom, you have the Af Fine-Tune Menu. Go in there and then turn on the AF-Fine-Tune.
Note: I had a quick look for the Canon version and you can see how to access it here: Canon AF Fine tune.
So now that we have our AF Fine-Tune enabled, we can begin to make some adjustments. If we look back at our imported images and review them to see what can be improved.
If you feel that the camera’s autofocus is missing the mark consistently, then you’ll need to make some adjustments in the fine tune menu of your camera. So for example, if your autofocus is consistently focusing behind the intended focal point, you’ll need to adjust the autofocus fine tune with minus numbers to bring it back to where it needs to be. Conversely, if the autofocus is consistently focusing just in front of the intended focal point (closer to the camera), you’ll need to increase the autofocus fine tune with positive numbers.
For example in the image above you can see my 28 to 105 mm Lens was consistently back focusing, which meant that the fine tuning adjustments ended up being -13 in the fine tuning menu. This process can take several attempts to get it perfect so you may want to make large changes to begin with to start seeing the effect. Make the fine tune adjustment, take some more shots, review the images in Lightroom and make any necessary adjustments again. Repeat the process until you’re happy.
A Bonus Tip for Nikon Shooters
Did you guys know that us Nikon shooters have a shortcut through this whole lens auto-focus calibration process, that allows the camera to read an image and make micro adjustments automatically?
Well, rejoice because most modern Nikon camera now have this rather hidden feature and here’s how you activate it.
Note: I honestly have not looked to see if this is possible with other brands like Canon and Sony.
Step One
Setup up your shot like we mentioned before. In fact, it can be any object that is fixed in front of your tripod. Activate live view, zoom in all the way, use single shot autofocus and select the smallest focal point you have.
Step Two
You don’t actually have to take a shot as the camera will do that for you in the next step. What you need to do next to hold the auto-focus selection button (often located on the auto and manual focus switch) and the video record button for about 3 seconds.
Step Three
If done correctly a window will appear asking if you’re sure. Make sure you’re firmly planted with a tripod as it suggests and hit ‘Yes’. I actually recommend very lightly touching the screen (if you have a touchscreen Nikon) to confirm this as any camera movement during the process will not allow you to proceed.
Step Four
If everything was done correctly, your camera will then show you another screen a couple of seconds later to say “The new value has been added to the ‘AF fine-tune’ ‘Saved value’ list.
You can now go to the fine menu and see what value has been assigned to your lens to correct it.
A Strong Recommendation
Although this is an automated process, I strongly recommend you run this process several times as each time you will likely get a different value assigned to the lens. Remember this is far from an exact process so this was to be expected.
The best solution I found was to simply take an average of several readings. So, for example, I ran the same process 5 times on my lens and here’s readings I got: -16, -15, -19, -13, -14. I just added them all up and divided it by 5 to get the average and then input that number as the best value.
Auto AF fine-tune failed
You will likely get the auto AF failed window a few times and here’s a couple of things I did to fix the issue.
1. Make sure there’s enough ambient light. If not, don’t be afraid to boost the ISO.
2. Shutter speed too low. I was originally shooting at a 60th but it needed a faster shutter of 125th to work in my tests.
3. The camera moved. Like I mentioned before, when the screen pops up asking if you’d like to proceed, be as gentle as possible to avoid any subsequent camera shake.
4. Improper source image. The image filing the focal point needs to have sufficient detail for the camera to look at. Mine had strong lines, but text on a non-shiny surface would work well too.
Closing Comments
It’s highly likely that you’ve read the procedure of how to calibrate your lenses before you’ve actually gone ahead and implemented the process for yourself. So before you dive in and start this admittedly mind-numbingly boring process, let me just warn you that this is not the holy grail of razor-sharp images but merely a single step in achieving them.
It’s also worth mentioning that this process only helps to get sharper auto-focus shots, it does not make the lens itself any sharper. If you wanted to test this further to see just how sharp your lens is then I recommend you use live-view, zoom in to the max and take some manual focus shots just to see how sharp your lens actually is a reference point for the auto-focus tests.
Do I really need to calibrate and fine-tune my autofocus?
My basic answer is no, I personally don’t feel this is necessary for most portrait shooters, or street shooters or in fact most shooters that are not using a tripod most of the time. I think if you’re a landscape, wildlife, or still-life shooter, then this is probably worth your time to do as critical focus is often crucial for what you do, but more importantly, achievable.
For those of us shooting portraits or fashion or just people in general, I don’t think you’d notice the adjustments being made here. These are micro adjustments remember, and hard to spot consistently even to the trained eye. Plus the adjustments are barely noticeable in a very controlled situation with the one specific goal is to spot these variances. There is very little chance that whilst we’re handholding a camera and taking a picture of another moving subject with focus and recompose variations that you’d notice these fine-tune adjustments.
Should you calibrate your auto-focus on all of your lenses the next time you have a spare afternoon?
Sure, it can only help.
Should you go out of your way to make calibrating your lenses a priority before you take another photo?
No, I don’t think so.
Well, there you have it. I hope this was useful and at the very least it’s given you some knowledge about the process.
Nikon Auto Focus Tune
About the author: Jake Hicks is an editorial and fashion photographer based in Reading, UK. He specializes in keeping the skill in the camera and not just on the screen. If you’d like to learn more about his incredibly popular gelled lighting and post-pro techniques, visit this link for more info. You can find more of his work and writing on his website, Facebook, 500px, Instagram, Twitter, and Flickr. This article was also published here.
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Because you may vary which Nikon lens you are using, the following does not contain full instructions on every Nikon lens operation. But the following list provides general information on working with standard AF-P and AF-S Nikon lenses. You should explore the lens manual for specifics, of course, but keep reading for general tips on using a lens with your Nikon D3500.
- Extending/retracting the lens: If you have a retractable lens like the AF-P kit lens, press the retractable-lens barrel button while rotating the lens barrel to extend and retract the lens. The camera won’t take a picture with your Nikon’s lens in the retracted position.
- Zooming: If you bought a zoom lens, it has a movable zoom ring. The location of the zoom ring on the kit lens. To zoom in or out on this lens, rotate the ring. (Some lenses instead use a push/pull setup, where you push and pull the lens away from you or toward you to zoom.)You can determine the current focal length of the lens by looking at the number that’s aligned with the white dot that’s labeled focal-length indicator above.
- Setting the focus method (manual focusing or autofocusing): How you switch between autofocusing and manual focusing depends on whether you’re using an AF-P lens or an AF-S lens, which is the other type of lens that works with your Nikon camera. Here’s the scoop:
- AF-P lens: Change the focusing method via the Focus Mode setting. The fastest method is to use the control strip, but you also can access the option from the second page of the Shooting menu, as shown on the right. Either way, to switch from automatic to manual focusing, select the MF (Manual Focus) option.To go back to autofocusing, revisit the Focus mode setting and choose one of the AF (autofocus) options. How many AF settings are available depend on your exposure mode and whether you’re working in Live View mode or using the viewfinder to frame your images. The default settings are AF-A (Autofocus Auto) for viewfinder photography and AF-S (single-servo autofocus) for Live View and movie photography.
- AF-S lens: These lenses for your Nikon typically offer an exterior switch for shifting from automatic to manual focusing. You move the switch to the A position for autofocusing and to M for manual focusing. On some lenses for Nikon camera, the switches may instead be marked AF and MF; some lenses have a switch position labeled AF/M, which means that you can use autofocusing to set initial focus and then fine-tune focus manually without changing the position of the switch.
- AF-P lens: Change the focusing method via the Focus Mode setting. The fastest method is to use the control strip, but you also can access the option from the second page of the Shooting menu, as shown on the right. Either way, to switch from automatic to manual focusing, select the MF (Manual Focus) option.
Even though you set the basic focus method via the switch, you control the behavior of the autofocusing system via the Focus mode option described in the preceding paragraph.
AF-P lenses also offer the option of autofocusing with manual override. But instead of moving a lens switch to activate or disable the feature, you use the Setup menu option. By default, this option (Manual Focus Ring in AF Mode) is enabled, so you can tweak focus manually after autofocusing. The only potential problem with the feature is that you can accidentally move the focusing ring, changing the focus point without realizing that you did so. It’s up to you to decide which setting you prefer. If the menu option is dimmed, your Nikon’s lens doesn’t support this feature.
- Focusing: With either type of lens, use these techniques to set focus:
- Autofocusing: Frame your shot and press and hold the shutter button halfway down to establish the focusing distance.
- Manual focusing: Rotate the focusing ring on the lens barrel. The position of the focusing ring varies depending on the Nikon lens you choose.
Nikon Auto Focus Lenses
- Enabling Vibration Reduction: Many Nikon lenses, including the kit lens, offer Vibration Reduction, which compensates for small amounts of camera shake that can occur when you handhold the camera. Camera movement during the exposure can produce blurry images, so turning on Vibration Reduction can help you get sharper handheld shots. When you use a tripod, however, check the lens instruction manual to find out whether you should turn off the feature. With some lenses for you Nikon, you need to disable VR so that the camera doesn’t try to compensate for movement that isn’t occurring.
On an AF-S lens, turn Vibration Reduction on or off by using the VR switch, found near the focusing-method switch. The available VR settings vary depending on the lens, so see the lens manual for details. (Some lenses for Nikons offer one setting for normal shooting and one for situations in which you anticipate lots of camera movement, such as when photographing from a speed boat.)
With an AF-P lens, turning Vibration Reduction on and off is a menu-based affair. Enable the feature via the last page of the Shooting menu, as shown on the left below. After you do so, you see a shaking hand symbol in the Information screen and Live View displays. Look for the symbol on the left side of the Live View display.
Vibration Reduction is initiated when you depress the shutter button halfway. If you pay close attention, the image in the viewfinder may appear to be a little blurry immediately after you take the picture. That’s a normal result of the Vibration Reduction operation on some lenses and doesn’t indicate a problem.
Nikon Focus Tune
- Removing a lens: After turning off the camera, press the lens-release button on the Nikon camera and turn the lens toward that button until it detaches from the lens mount. Put the rear protective cap onto the back of the lens and, if you aren’t putting another lens on the camera, cover the lens mount with its cap, too.
Always switch lenses in a clean environment to reduce the risk of getting dust, dirt, and other contaminants inside the camera or lens. Changing lenses on a sandy beach, for example, isn’t a good idea. For added safety, point the camera body slightly down when performing this maneuver; doing so helps prevent any flotsam in the air from being drawn into the camera by gravity.
Focal length and the crop factor on your Nikon D3500
The angle of view that a lens can capture is determined by its focal length, or in the case of a zoom lens, the range of focal lengths it offers. Focal length is measured in millimeters.
According to photography tradition, a focal length of 50mm is described as a “normal” lens because it works well for the type of snapshots that users of those kinds of cameras are likely to shoot. A lens with a focal length under 35mm is characterized as a wide-angle lens because at that focal length, the camera has a wide-angle view, making it good for landscape photography. A short focal length also has the effect of making objects seem smaller and farther away. At the other end of the spectrum, a lens with a focal length longer than 80mm is considered a telephoto lens and is often referred to as a long lens. With a long lens, the angle of view narrows and faraway subjects appear closer and larger, which is ideal for wildlife and sports photographers.
Note, however, that the focal lengths stated here are 35mm equivalent focal lengths. Here’s the deal: For reasons that aren’t important, when you put a standard lens on most digital cameras, including the D3500, the available frame area is reduced, as if you took a picture on a camera that uses 35mm film negatives and cropped it.
This crop factor varies depending on the camera, which is why the photo industry adopted the 35mm-equivalent measuring stick as a standard. With the D3500, the crop factor is roughly 1.5x. Here, the red line indicates the image area that results from the 1.5 crop factor.
When shopping for a lens, it’s important to Remember this crop factor to make sure that you get the focal length designed for the type of pictures you want to take. Just multiply the lens focal length by 1.5 to determine the actual angle of view. Not sure which focal length to choose? Nikon offers a Lens Simulator tool that shows exactly how different focal length lenses capture the same scene. (If the link doesn’t take you to the simulator, just enter the term Nikon Lens Simulator in your browser’s search engine. Nikon has a way of moving things around on its websites.