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This compact ruler allows you to determine if your lens is auto-focusing accurately as it should. It is an essential tool that is particularly useful when shooting with a shallow depth of field, where focusing should ideally be "spot on". You can use this ruler to determine how "off" the focusing is for a particular camera / lens combination and, on supported cameras, adjust the camera's auto-focus settings to resolve this.
On Nikon cameras, this feature is known as "AF Fine Tune". On Canon and Sony cameras, it's known as "AF Micro Adjustment". Please refer to your camera's instructions manual to see if this feature is present.
Size:19*12.3cm
Package Included:
Lens Focus Calibration Card X6
Usage
1. Set up the ruler.
2. Ensure both the camera and ruler are level, exactly perpendicular and at the same height. It is best to mount the camera on a tripod to do this.
3. Set the lens to the widest aperture to obtain the shallowest depth of field. This will make it easier to determine if your lens is focusing accurately. Auto-focus on the QR-Code at the center of the ruler, then take a photo.
4. Inspect the photo to see if focusing is accurate. It is recommended that you do this on a computer since you will be able to see better on a bigger screen. If focusing is accurate, the '0' on the ruler should be the sharpest point on the image and the other numbers get blurrier as you move away from the 0.
5. If any number above the 0 is clearer, then your lens is backfocusing. Otherwise, if any number below the 0 is clearer, then your lens is front focusing. In either case, you would have to set the auto-focus micro-adjustment parameters on your camera body until you are able to obtain a picture that is sharpest at the '0' on the ruler.
Compass
2025-09-01 12:20:49
Dirt cheap but perfectly functional. Allowed me to get my 24-70 and 70-200 dialed in and cured for separate back and front focusing issues at close up and further zooms. Also allowed me to demonstrate just how prone to purple fringing my 85mm F1.2 is.How to use: Set your camera and lens up with the lens set to its widest aperture. If it's a zoom, set it first to widest angle (for a 70-200, this would be at 70mm), and snap a pic focusing on the central, vertical target card with the circles and QR code on it. Take that photo into your editing software and look at the checker stripe pattern that goes up the longest face of the triangular shape. Look to see where on that scale the image is best in focus. On my sample image, which is for a Canon F1.8 mk II at 50mm, you can see that it is in focus around the Zero mark, which means this lens does not need any microadjustment as there is no back or front focusing going on. If this is not the case and it seems to be in focus in front or behind the zero point, take a guess at the amount of adjustment needed, take another snap with the camera, re-import and see what has changed. If your lens is now further out of focus, make your change back the other way, and rinse and repeat. If you are adjusting a zoom lens, once you have the widest angle calibrated, zoom all the way and make adjustments for that setting.Can't go wrong for the price, plus you get a handful of them for the price, so you don't have to worry too much about how you treat them.
Grant Petty
2025-08-26 15:59:24
This item is inexpensive, well-designed, and easy to use. The one shortcoming is that it’s small, which means that you’ll likely be doing your focus calibration over a far shorter distance than you would normally shoot with a given lens. You really need to fill at least half the frame with this target to avoid pixelation and to really see the depth of field, and that means a distance of a foot or less for a wide angle lens, four or five feet for a stronger telephoto lens. I don’t know how much focus calibration is distance-dependent, so this might or might not matter.
Josh Jenkins
2025-08-25 14:17:30
Purchased to calibrate a couple of Sigma lenses with the usb dock. Worked perfectly!
DC3
2025-08-09 15:04:42
I'm a photographer and photography instructor working in a high-end photography store, and I use this to test focus my own as well as customers' cameras and lenses. It works great, especially at this price. It comes flat and folds up cleverly into the form that you see here. The card material isn't especially heavy, probably similar to a take-out food box, but it's good enough because you don't really handle it much.There's no instructions, but hey, if you need instructions maybe you shouldn't be using this. Just make sure the back of the camera is parallel to the vertical panel, lens perpendicular to it, shoot at wide-open aperture. The zero on the rulers should be in sharp focus, fading in front and behind it. If the zero is out-of-focus, then you're either front focusing or back focusing. Make adjustments to correct either situation if your camera has that feature. The 6-pack means I can carry one in each of my camera bags, plus have one at home and one at the office.
Leon O. Allen
2025-08-01 14:21:47
Item evaluated my lens quickly. I would definitely buy again.
Kevin Critchfield
2025-05-25 14:31:07
All of my camera gear was stolen last year on holiday so I've been rebuilding my photo kit. I started with a full-frame Nikon and bought only 'better' prosumer-grade lenses but was disappointed that my shots were not very sharp. After treading about AF Tuning, I bought this Lens Focus Calibration Tool. What a difference! This tool is not as sophisticated as some of the others but it does the job at a fraction of the cost.
Tina
2025-05-19 15:47:11
These are made out of paper, about the thickness of a birthday card. You insert tab A into slot B to assemble it. You get six of them. There is to too much flex in the in the paper and too much variation in assembly to get a very accurate read on front or back focus. You'll never know how much of the front or back focus you see in your test shots are caused by the inherent inaccuracies of this target or your lens. You get what you pay for, so if you are attempting to get your lens adjusted for tack sharp focus, this is not the target for you. If you just want to get in the ballpark this should work fine.
Anthony
2025-05-02 12:43:30
Six for 7 bucks. The only problem with this product is the ship time, but I was told at time of shipping how long it would take (I amjust impatient). The product is what it claims to be...made from heavy-stock paper, it easily folds into position. The images are accurate. Plus, you get six of them. If you don't know how to use it, then either read up or skip this product. But for the price and what you get, it is a time saver. Your camera needs to have the AF micro focus adjust feature. If it doesn't, all you can do is determine if your AF system (camera and lens combination) is off or not (if it is off then you need to send them in for calibration, but if you have AFMFA you can tweak it yourself). Well done.
G D
2025-04-29 09:23:17
Works absolutely perfect for the micro adjustments on my old DSLR’s. Also tried it with my mirrorless just out of curiosity to check they really don’t need adjustment (they don’t, it was spot on the money!).
Stéphanie Côté
2025-04-14 18:14:15
Produit d'excellente qualité et livraison rapide! Je recommande!
Cliente
2025-04-07 15:14:33
Buono e funzionale
Terry666
2025-03-13 14:33:55
I didn't believed it will be any good but with the price I thought worth a try!...I needed to use it once and worked fine!!!
poron
2025-01-30 14:40:56
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