But it will only work if you have consistent focusing. The you have to find your target like a building with a bunch of windows or a very long brick wall or a fence and make sure you focus at the point at 45 degrees and the be at the distance that the white line is the same as before sitting on the part of infinity range. Then go outside and focus on something so the white line in your focus distance window matches the software screen. Use only the dedicated USB cable that came with the dock, as other cables may not work properly. Please note Test results Before & After may not initially show vast improvements. Disconnect the lens from your camera body and connect it to the dock, making sure that the dock is properly secured to the lens. Images shown below are taken from the Sigma lens calibration control panel and refer to the Sigma 150-600mm F5-6.3 Contemporary lens. By connecting a Sigma Art, Contemporary, or Sports lens to a computer with the Sigma USB Dock, photographers can update the lens firmware and adjust focus. After connecting the USB dock to my PC, the Sigma Optimisation Pro software first checks for updated firmware for the USB dock, then checks for updated firmware for the lens that is attached to the dock. This unique calibration can therefore yield the best professional results from your Sigma lens. You need to look at the software screen to see where red line is sitting at infinity. I used Sigma Optimisation Pro version 1.1.0 on my PC running Windows 7 Pro 圆4, to calibrate my Sigma 35mm f/1.4 DB HSM lens for Canon. (Most lens calibration software options will include either a hard target or a downloadable target for you to use.) Step 2 Put your camera on a tripod at a distance from the target that’s 50x the focal length of the lens. Is it consistently inaccurate? Are you running the test outside or inside in the low light? I have no values in the last column (infinity distance) as I don't plan on shooting at infinity.Ĭould it be that I need to put values in the last column for accurate focus for subject distance > 0.7m? In the dock, there are 4 distances for which one can input fine tune values. The four distances to calibrate on the dock are 0.28m, 0.35m, 0.5m & Infinity. Sigma 150-600mm 5-6.3 Contemporary DG OS HSM Lens for Canon. I know there are many thread discussing autofocus problems and each describes different ways on how to calibrate it using the Sigma dock. I check the lens scale after taking a picture to get the subject distance. Focus using the viewfinder Turn off live view and focus using the viewfinder. Set your camera on a Tripod A tripod or other flat surface is essential. I meant that even after calibration focus is still inaccurate when the subject is greater than 0.7m (not 0.5m I checked again). Here’s a quick summary on How To Calibrate Your Lenses: Get a Calibrator There are many on the market but we recommend the 25 focus pyramid. Re your final query, Sigma UK tech recommend starting from the minimum distance - I cannot comment on the statement you quote from other forums. ![]() If your lens is anything like mine it should show infinity at around 35-40 metres at 35mm focal & f/1.8. ![]() You have to calibrate for the minimum one first and move down the focal lengths, then select the next distance & adjust until you get to & complete the infinity column. Perhaps you could rephrase?įor the 18-35, the dock has four distances along the columns and four zoom levels. The first thing came up after I googled "focus calibration on mirrorless"īut in order to find out and reset focus calibration on Sigma lens you need USB dock.It is difficult to understand your issue if you are using the Sigma Dock. I tried to google my way to an answer but couldn't seem to find anything so I thought I'd try here. In this step by step video, I show you how to calibrate your sigma lenses (the 120-300 in this case, but the principle is applicable to all Sigma lenses). I'm talking stationary objects here so something is amiss. I ran my first copy of this lens through Reikan Focal, and it came out as needing +22 adjustment, so I returned it to Amazon who sent me a new copy. If anything, I noticed when using that lens with my XH1 if it missed it would miss behind the subject. I also have the Sigma 150-600 but with that lens I can't seem to reproduce the same issue. This may be an incredibly stupid question but is there any chance that a Sigma lens that I buy used (18-35) has been calibrated by the previous owner via the dock and that would be causing an issue with it front focusing on my Fuji XT4? I understand why calibration exists and the concept of mirrorless reading focus directly on the image sensor but I'm getting front focus issues with my XT4 and it's pretty far off pretty consistently with the Sigma 18-35 via the Fringer adapter.
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