However, the histogram distribution of a well-exposed image will vary greatly depending on the subject. A histogram with a fairly even distribution of pixel values usually indicates that the image is well exposed, with good contrast. When the histogram runs off the right side, the image will have many white pixels-either because the image is overexposed or because it is a bright scene such as the beach or snow. When the histogram is higher on the left side, the image is mostly composed of dark pixels, causing it to appear dark-either because the image is underexposed or because it is a dark scene such as night shot or sunset. By examining the histogram you can gauge the over-all exposure of an image. He contacted Sigma who looked into it and confirmed it was the latest firmware that had done it,then the normal statement that they could not guarantee Compatability with third party converters. The vertical axis shows the proportion of pixels at each level of brightness. 1 Just read a post on a bird watching forum, a chap had updated the firmware on his 150-600 and it had stopped working with the latest Canon converter. The horizontal axis shows the brightness level (from 0 to 255), with darker pixels towards the left side and brighter pixels toward the right. Thank you for the great customer service, treating customers with respect, and for making great lenses.A histogram is a graph depicting the distribution of brightness values in the image. Sigma, this is customer service done right. I don’t think I have ever seen a repair at Nikon take less than 10 days. If your Sigma lens has developed a fault and needs a thorough investigation, our technicians can provide a full service estimate for free for you to approve. When I drop something off for repair at Nikon, even with priority Nikon Professional Services repairs, I am waiting a week or more just to find out what the problem is. Nikon, I’m talking to you now… you could learn a thing or two about customer service from Sigma. 12 days turnaround time for repairs through SIGMA New York - with 44 to FEDEX for shipping/boxing. YET ANOTHER UPDATE Currently 1.5 years after purchase. I was very impressed with how I was treated and how my repair was handled. Not looking forward to dealing with SIGMA if the lens ever needs maintenance. The tech thanked me for coming in and handed me a receipt and my lens. I hadn’t known about shutting off the OS system when putting the lens away but I will be sure to do so going forward. He suggested that I shut off the OS system when the lens is not in use to help prevent damage to OS the system. Not only that, but he had cleaned the lens for me as well! He also told me he had replaced the contacts as they had some slight wear. The optical stabilization (OS) control had failed and he had replaced it. He showed me what had failed on the lens. When the tech returned again he sat down with me. Better to pay for the repair then lose a job. He offered me a cup of coffee and told me the repair would take about fifteen minutes.Īt this point I fully expected to have to pay for this repair since I didn’t have the warranty card. CARRY/MOST FD 50 MACRO 267490 SIGMA LENSES FUR F0100 MACRO 457. He then told me he would fix it for me right now. In the initial service announcement, Sigma noted that it believed that the issue was specific to Sigma 28-70mm f/2.8 DG DN Contemporary lenses for both L-mount and Sony E mount with serial numbers. ORDERS ONLY-TOLL FREE 'LI ee27e53 INFORMATION OR CUSTOMER SERVICE. He asked if I had my warranty card and I told him I had not thought to bring it. When he returned he said he knew what the problem was. I explained the problem and he told me he would test the lens and be right back. After a minute or two a tech came out and sat down with me. She handed me a form and said she would get a technician to help me. When I arrived at Sigma I was met at the door by a women who greeted me with a smile and asked if I had a repair. My previous repair had taken only 24 hours for Sigma to complete, but I was fully prepared to leave the lens for a week or more. I hopped in my car and took a short ride over to Sigma USA’s headquarters. Since this is my primary concert and hockey lens I was concerned that it would impact my upcoming shoots while it was at Sigma for repair. Recently, my trusty Sigma 70-200 mm f 2.8 DG HSM lens failed during a photo shoot. When I need to have a camera or lens repaired I need only take a short drive to drop off an item for repair. No 36&27 Kaveri Nagar 5th Cross Street, Bharathi Avenue, Kaveri Nagar 5th Street Kottivakkam Chennai 600 041 Tamil Nadu, India. Close proximity to New York City is one, but another is easy access to the headquarters of almost every major camera and lens manufacturer operating in the USA. Living on Long Island has it’s advantages for a photographer.
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