The Sigma 18-35 is spectacular, I can't recommend it enough. It worked ok, but wasn't any better or faster than just taking regular pictures. I also tried taking pictures of a high contrast flat subject next to a ruler at an angle to determine how to make the adjustments. I got different, and I think inferior results than with my taking regular pictures routine described above. I'm very happy with the results.Ĭoincidentally, I also tried adjusting other ways previously but wasn't happy with the results: I tried the "dot tune" method. I think my settings are something like 3 and zero on wide/tela. I then took another picture with the microfocus setting one notch higher or lower. I adjusted by taking photos in my normal use case (of people, indoors in good light), viewed the picture on the camera fully zoomed in, and determined if the focus looked good. I used microfocus adjustment within the camera, I didn't use the Sigma dock. I have a 18-35 which I use with a Canon 70D. So I calibrated only 120mm first at all 4 distances. First of I have learned from Sigma reps that adjustment of one FL/distance effects the other FL/distance. They don't post charts taken at the proper distance to prove it and expect us to take their word for it.Īs far as 18-35mm I don't have it but I have 120-300mm sport which required the same calibration. Some people claim that if they buy Nikon camera and Nikon lenses it does not need calibration which in most cases is just hearsay. Sigma lens is calibrated but it is not calibrated to your camera. Two lenses 16-35mm and 24-120mm I bought with it were not calibrated the whole Kiddie Kaboodle was delivered to Nikon for calibration. When I bought D800e it was not calibrated either. The lens is not factory calibrated, which means it will most likely require calibration at home with Sigma USB Dock. If you have any further questions be free to ask. If you can, try that lens before buying, and if you can, try more then one copy. When I look at amazon or B&H reviews of the lens all I can see is that people are very satisfied, as much as some people are satisfied with OEM lenses. My Sigma 18-35 when shot at 35mm f1.8 is more accurate than two 35 f/1.8 DX primes I have tried. Maybe less thorough calibration will yield very good results as well. I know some people are frightened of the process and some people think that lens should work properly out of the box considdering how much money they have invested, but there are people who enjoy shooting charts, calibrating and other do it yourself methods. So basicaly a lot of mounting and dismounting the lens as well as connecting and disconnecting with the PC. First you make test shots to determine if lens has front or back focus at given focal length, then, depending on the issue you dismount the lens, connect with the dock, enter the values, then test again. You start of with 18mm and closest distance of 28cm. With Sigma USB dock there are 4 focal lengths (18, 24, 28, and 35mm) and 4 focus distances to calibrate which makes for the total of 16 adjustment values to be entered. Now with current experience and gear, I would say two hours. I didn't have tripod at the time so I spent some time making setup for camera to stand on. Could be four-five hours, but I wanted to be very thorough. Thanks for the reply, how much time did you spend calibrating it? This sites review said it took them 5 hours.Ī few hours, I don't recall. Here is my review of this lens here wrote: My piece of advice is to try the lens before buying and cancel your purchase if you notice inconsistant autofocus which unlike front and back focus cannot be calibrated. The issue is most prominent when outer focus points (non cross type †) are used. When there is enough light and contrast autofocus is highly accurate, but is suffers to some degree at low light, but then again most lenses do and most cameras for that matter. However and ironicaly, this lens is meant for low light shooting among other things but autofocus accuracy in low light is not something to write home about. I use it for all kinds of photography because it is very versatile. If you think you're not up to it than maybe this lens is not for you. Can anyone who has this lens comment on focusing issues or any other pros / cons? I'll be using it on a Canon 80d. I'm considering buying the Sigma 18-35 Art lens but concerned about focus issues I've read about and not excited about a possible 5 hours of time on MFA (according to the DP review).
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