Calibrate Sigma 18-35mm (Nikon)

Started 2 months ago | Questions thread
OP mohxinn Regular Member • Posts: 131
Re: Calibrate Sigma 18-35mm (Nikon)

Kazmarov wrote:

It is difficult to understand your issue if you are using the Sigma Dock. Perhaps you could rephrase?

For the 18-35, the dock has four distances along the columns and four zoom levels. 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. If your lens is anything like mine it should show infinity at around 35-40 metres at 35mm focal & f/1.8.

Re your final query, Sigma UK tech recommend starting from the minimum distance - I cannot comment on the statement you quote from other forums.

Sorry for not being clear. I meant that even after calibration focus is still inaccurate when the subject is greater than 0.7m (not 0.5m I checked again). I check the lens scale after taking a picture to get the subject distance.

The four distances to calibrate on the dock are 0.28m, 0.35m, 0.5m & Infinity. I have no values in the last column (infinity distance) as I don't plan on shooting at infinity.

Could it be that I need to put values in the last column for accurate focus for subject distance > 0.7m?

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