Archivi categoria: usbdock

This is the Power of Sigma’s $60 Lens Dock for Fixing Focus

Sigma’s Art series of lenses are already praised for their image quality and sharpness, but you can hone that sharpness even more by adjusting the focus of your lens using Sigma’s USB Dock. Photographer Kyle Kozinski recently discovered just how much of a difference it can make.

Kozinski noticed that his $799 Sigma 18-35mm f/1.8 Art lens was slightly off in its focusing, so he shelled out $60 for a Sigma USB Dock.

“Everything up to close to infinity was front focusing and then at infinity it was back focusing,” Kozinski writes. After calibrating his lens’ focus with the USB Dock and Sigma Optimization Pro software, Kozinski saw a night and day difference.

Here are two 100% crops from photos shot with the lens before and after calibrating the focus:

As you can see, the lens now focuses correctly on the text found on the side of the drill driver instead of slightly toward the front or back. This tight, accurate focus is especially helpful for things like shooting portraits with a very shallow depth of field, when you want to ensure that your subject’s eyes are tack sharp.

Many modern digital cameras feature a AF Microadjustment feature for fixing similar focusing issues, but Sigma’s system goes a step beyond.

“The dock allows multiple adjustment values over different focal lengths and focusing ranges whereas the micro adjustment is the same value for everything,” Kozinski explains.

You can find more of Kozinski’s work on his website, Facebook, and Instagram.

Image credits: Comparison photos by Kyle Kozinski and used with permission

Testing Out Sigma’s Lens Calibration USB Dock and Optimization Pro Software

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software sigmausbduck

“Commerce makes progress. Fortune passes everywhere.” – Frank Herbert

A few years ago I was accused of being a Sigma hater. (For the record, I did hate their quality control and so-called repair service at that time, and I didn’t hesitate to say so.) For the third or fourth time in the last year, I’m about to be accused of being a Sigma fanboy.

I’m pretty certain I haven’t gone soft over the last 4 years. I am certain, though, that Sigma Photo, Inc. has changed a lot in that time. Truth is, they’ve been making serious waves in the photo industry these last few years. They’ve improved their repair service and quality assurance. They’ve released some world-class lenses at way less than world-class prices lately. And now they’ve released their USB dock and Optimization Pro software.

I spent the past weekend playing with it. Partly because I really think this is a revolutionary product and I wanted to see how it worked. Partly because I desperately need a ‘Honey, I’ve really got to do this for work’ excuse or I’d have been restaining the deck.

My conclusion, as usual, first: if anything is going to get the attention of those who like to disable features in firmware, overprice lenses, and limit our ability to customize, this might be it. I did some adjustments this weekend, in about 10 minutes, which would have required a trip to factory service on a Canon or Nikon lens. And let me stop the Fanboy stuff before it starts: you may never have needed to make this adjustment on your 10 or 20 Canon or Nikon lenses, but I’ve sent dozens of them to factory service adjustments for exactly the issue I’m going to demonstrate today.

Quick Overview of the USB Dock and Optimization Pro Software

The directions are pretty simple:

  1. Make sure you buy the dock in the proper mount (Canon, Nikon, or Sigma).
  2. Download the Optimization Pro Software HERE. It’s about 3.4 Mb in a zip file, available for Windows or Mac.
  3. Open the software, put the lens in the USB dock, and plug the USB port in your computer.

Once you hook things up the program the program opens to a nice, straightforward main page.

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software window1 copy

The firmware update button reads the lens’ firmware and lets you know if you need a firmware update. Push yes and it updates in about 20 seconds.

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software update copy

Adjusting a Lens

First of all, here’s a nice 10-minute video that Sigma made that shows you the use of the device very clearly:

If you’re like me, though, you might prefer a 30 second blog read. It really is that simple. Actually, 10 minutes is more time than it took me to do my first adjustment on the 35mm f/1.4 (of course, without reading any manuals).

I should be clear, I don’t do a full-ballistic, OCD, 600-shot microfocus adjustment. I’m too aware that phase detection AF is a shotgun, not a sniper’s rifle. I’ll take nearly perfect in 10 minutes rather than perfect in 4 hours every time. Plus, like I said, I’ve got a deck to stain. Unless I can put it off so long that my wife gets frustrated and does it herself.

I chose a lens that is perfect for this software. This copy of the 35mm f/1.4 is perfect on my Canon 6D at close and intermediate distances, but at long distances it backfocuses badly. I can do a microfocus adjustment to correct long-distance focus, but then the lens is frontfocusing at near distances. Without the Sigma dock and software, the only option was a trip to the factory service center to change the lens parameters.

Since I was at home instead of the office, I didn’t have Focal, LensAlign charts, or any of the other things that seem to be considered necessary tools for autofocus adjustment these days. So I made do with a placemat and my back yard.

Since I plan on using this lens outdoors in daylight I wanted to adjust it in daylight (autofocus can change slightly in different lighting conditions, if you aren’t aware). I started with a placemat set in front of a picture window.

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software closetarget copy

Spot focusing on the tip of the green leaf, I took several shots each at minimum focusing distance, 3 feet, and 6 feet. They all showed focus was accurate, as in the samples below.

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software mfd copy

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software 3feet copy

Focusing at longer distances, however, showed the lens backfocused quite dramatically. In this image the focus point was on the small yellow leaf in the foreground (I’ve cropped the image to show the area behind the focus point):

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software infinity copy

Opening up the Sigma adjustment window shows I can make adjustments at 4 distances. With the 35mm, 3 of those are close: roughly 0.3, 0.4 and 0.7 meters. The other is infinity:

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software afadjustwindow 1024x658 copy

I left the close adjustments at zero and gave infinity adjustment a -12. You just click on the area you want to adjust, move the slider the amount you want adjusted, and then click the “Rewriting” button. (The “Rewriting” button is the only part of the software that isn’t totally intuitive; it isn’t highlighted until after you click on it.)

A repeat shot outside showed -12 was way too much adjustment so I went back and reset the infinity adjustment to -8. That was spot on as shown in the image below. I rechecked AF at closer distances and it had not changed a bit:

Testing Out Sigmas Lens Calibration USB Dock and Optimization Pro Software final2 copy

Total elapsed time for firmware update, focus checks, focus adjustments, and final check was just about 10 minutes. Obviously a zoom lens, which can be adjusted both at different focal lengths for different focusing distances at each focal length, will take longer.


For the even slightly gear-head amongst us, this is an awesome tool, giving us the ability to fine-tune autofocus adjustment much more completely than simple camera microfocus adjustment. At $59, I consider it an amazing bargain for anyone who owns one of the Sigma Art, Contemporary, or Sports lenses (it does not work on older lenses).

I’ve already heard a couple of people complain that it should be included with the lenses but I disagree. First, the price is very reasonable and the software is free. Why would they include it with each lens (which probably means each lens costs $59 more) when you only need one for all of your lenses? Not to mention half the people who buy it would never use it.

I’ve heard others state that only Sigma lenses need such a device. I’ll meet them part way: I think there is probably a more frequent need for such adjustment on third-party lenses, but I can absolutely guarantee you that the big-boy’s lenses do indeed have this same kind of problem, at least occasionally.

Whether they need it more frequently or not, now Sigma DOES have such a device. Which means, for example (just pulling a random lens out of my hat), the Sigma 35mm f/1.4 is now not only sharper and less expensive, but also more accurately adjustable than the manufacturer’s 35mm f/1.4. I wonder if anyone is hearing footsteps*?

* For non-U. S. readers, hearing footsteps is a term used to describe an American football player, who, thinking he is wide open and about to catch a pass, unexpectedly hears the footsteps of an unseen opposing player about to crush him.

About the author: Roger Cicala is the founder of LensRentals. This article was originally published here.

Sigma Sets Release Date for USB Dock, Shows Off Customization Options

We’ve mentioned Sigma’s upcoming revolutionary USB dock before, but until today we had no idea when the product would become a reality or how much it would cost. Thankfully, Sigma has cleared that up for us, and thrown in a demo video to boot.

According to a Sigma press release, the new USB dock will hit digital shelves in early May for a street price of $60 and an MSRP of $80. The dock has people excited as it seems to be the first product of its kind, and Sigma lens users have been itching to get their hands on it ever since news broke of its existence.

Sigma Sets Release Date for USB Dock, Shows Off Customization Options sigmadockandlens

Customizations and firmware updates will be done using Sigma’s Optimization Pro software, which will launch alongside the new dock. The dock/software combo will allow you to toy around with Sigma’s entire Global Vision lineup. You’ll be able to update firmware and adjust focus settings for all of the lenses, while additional adjustments such as tweaks to AF speed, adjusting OS functions and a focus limiter will be limited to sports lenses.

Speaking of sport lenses, Sigma also announced that a new Global Vision Sports lens will release alongside the USB dock in May. The new 120-300mm f/2.8 DG OS HSM Sports lens from Sigma will be a bit pricier though, tipping the scales at an MSRP of $3,600.

Check out the demo video at the top or follow the links to Sigma’s website for more details on the upcoming dock and/or lens.

Sigma’s New 35mm f/1.4 Costs $899 and Can Connect to a Computer via USB

Sigmas New 35mm f/1.4 Costs $899 and Can Connect to a Computer via USB sigma35mm14

Sigma has officially launched its new 35mm f/1.4 DG HSM lens for Canon-, Nikon-, Sony-, Pentax-, and Sigma-mount cameras. The Japanese-made lens features a sleek matte finish, low dispersion elements, multi-layer flare-reducing coating, a hyper-sonic motor for speedy and quiet AF, and a 9-blade diaphragm for smooth bokeh.

Priced at $899, it’s much more affordable than lenses with the same focal length and aperture offered by heavyweight camera companies. By comparison, Canon’s offering costs over $1,300, Nikon’s is over $1,600, and Sony’s is over $1,400.

What’s really interesting about the new Sigma 35mm f/1.4 is the new USB dock (sold separately) that will allow you to connect your lens to a computer:

Sigmas New 35mm f/1.4 Costs $899 and Can Connect to a Computer via USB sigmamount

Using a special program called SIGMA Optimization Pro, photographers can make adjustments and updates to their lenses themselves — things like upgrading the lens’ firmware, tweaking the focus to ensure that it’s tack-sharp, adjusting various parameters to suit their personal needs.

Some DSLRs already offer a micro-focus adjustment feature in the cameras themselves, but being able to tweak the focus on individual lenses is something that should be well received by photographers.

Sigma tells us that this lens is the first of its kind to offer this type of USB connectivity. All future lenses released under the new Global Vision line will have this feature.