Datacolor SpyderLensCal - Optimize Your DSLR's Auto-Focus. Essential Tool for Razor-Sharp Focus and Outstanding Images

This thing works much better than the folded paper charts that you have to assemble. I can calibrate my lenses with this one on top of any table, and always get accurate reference. The only thing is that this is a very simply item, there's nothing high tech about it, and for what it is, it could be sold cheaper and still be profitable to the company. If you're struggling with lens calibration, this chart will definitely help a lot. This is a must have for any Tamron G2 lens owner with the tap in console, as they require fine tune calibration 90% of the times. After good calibration, they're spectacular, but not before.

Until we all switch to mirrorless cameras, adjusting the focus with a tool like this is necessary. Every lens and camera is a bit different and if you want accurate focus you need this. However don't get fanatical with it. You really don't have to setup a tripod and perfectly level everything, just generally shoot at the target a few times, zoom in on the results from your camera screen, and adjust the settings in camera. This cost more than printing out a test chart, but it folds up, is easy to use, and has a great target for a focus system to lock on too.

I should have looked at the overall dimensions when I made the purchase. For some reason, I thought it would be bigger. When "assembled", the SpyderLensCAL SLC100 is nearly 6" square. Folded flat, it is approximately 8.5" x 5", easy enough to fit inside a camera bag if necessary. It is a nice piece of gear for calibrating lenses though, far better than my "MacGuyver'ed" attempts at one. I purchased it to calibrate my Canon EF 50mm F/1.2L since some of my images just seemed softer than I was expecting. It's made of a sturdy plastic that folds down flat for easy storage. The focusing surfaces of the device are covered in matte finish plastic stickers. On my copy, the vertical plane sticker was slightly askew, but I didn't feel that it would affect focusing accuracy. Overall, a great tool, but I deducted one star for price.

I got this to check out the autofocus on my new Nikon D850 DSLR. The design permits an extremely fine readout of the subject focal distance, perhaps too fine for a reliable adjustment. However, as you work with it, you can get a sense of where your autofocus sits, particularly with a very sharp lens used wide open. I'd guess most photographers could check/adjust their autofocus just fine without this device. But for very fussy photographers curious about how precise they could adjust their autofocus, this is it.

Many have already stated its an overpriced piece of plastic and they are right. It is absolutely overpriced but it actually works so it has a place. It has helped me better dial in my lenses without having to keep a journal on every lens I own. Good stuff but definitely overpriced. It is also much smaller than expected.

This is a well made product and intelligently designed. I received this in the mail today and have already used it to calibrate two lenses. Unlike some of the competition, this is made from a robust plastic that doesn't sag or warp. It folds flat and is easily portable with the rest of my camera equipment. It can be put on a flat surface or attached to a tripod using the built in brass threaded insert. It has a built in level that helps with setting up. Well worth the money spent as this will last a long, long time. At this point, I have no complaints at all... I will update again when I get all of my lenses calibrated for the different camera bodies. Buy with confidence.

I bought this to use with my Tamron lenses that work with Tamron's Tap-In unit. For the shorter focal length lenses it made it easy to snap the images, adjust the lens through the Tamron software and retest. Could I have made something with a ruler and smoother materials for a lot less, yes, but this was just convenient and quick. Now I don't see how this would work for longer focal lengths as you need to be a good distance away and actually seeing the ruler demarcations becomes a bit challenging after zooming in within LightRoom. Great tool overall though. It is plastic, but folds flat and can fit into my camera bags easy enough.

Already used to adjust 5 lenses and my pictures are more sharp. The ruler is hard to differentiate when calibrating (at least with my lenses). I have a hard time determining the sharpest point and the smaller lines between the main numbered lines are no help. I have to determine the out of focus numbers in front and in back and then adjust from there. I paid full price which means that this was a bit pricey, but I have kept this in my camera bag which I take with me every week as I travel (airline). Folds flat and very convenient to have with me as I switch lenses (Gear Acquisition Syndrome, I have way too many lenses). Seems to be holding up well and it is pretty durable for my needs. I usually set the Lenscal on the back of my rental car, so the built-in level comes in handy. It should be about $20 less to make it a good value for the money, but I would buy again.