Lens Focus Calibration Tool Alignment Ruler Folding Card(pack of 6)

So, it's a piece of printed cardboard. But it's good quality and much easier than the 'standard' way of fine tuning focus - with a yardstick/metre rule or tape measure at 45% resting against a target (google it for for details if you don't want to wait for one of these). Several different places to check focus against depending on how far out your focus is when you start, and it's very, very cheap. For what it is and what it costs, it's really, really good. And I don't quite understand how anyone can review something they haven't actually used(?). Instructions are in the detailed product description on Amazon.

Although it is made of sturdy paper it is a clever design to enable you to adjust any focus errors. I have only tried it once so far and have not had time use it fully but it is a cost saving way to adjust your lenses.

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!).

it did the job well. Just remember lenses under 50 mm will need a bigger card. As they look tinyyyyy in the view finder. Great product

arrived on time and was very useful for the calibration job. At this price you can't complain particularly if you need to calibrate on the fly.

Simple but effective device to check lens calibration if your camera has fine focus control. Be sure to use spot metering when focussing on the device, and either the widest aperture or the longest focal length to minimise depth of field in order to assess back or front focussing

Easy to assemble, easy to use. A must for every DSLR owner.

It works and does the job

Produit d'excellente qualité et livraison rapide! Je recommande!

Buono e funzionale

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.

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!!!

6枚セットで安い！厚紙性で耐久性もそこそこ自分でピント調整するには十分使える