![]() ![]() If GL Optics can keep making quality lenses like these and keep the price down, I'm confident they'll give any manufacturer a run for its money. As more manufacturers do more rehousing projects ( GL's upcoming Zeiss Otus set, for example) there's going to be a lot of new glass options for filmmakers. Hi everyone, Im having issues with focus on this lens while using my GH5. If GL Optics can keep making quality lenses, I'm confident they'll give any manufacturer a run for its money.ĭespite the fact that Sigma is making its own rehoused version of many of its popular lenses in the near future, the GL Optics are a solid option for independent filmmakers and cinematographers looking to add a strong base to their kit. Sigma 18-35mm 1.8 + Viltrox EF-M2 II Manual Focus Problems. The store will not work correctly in the case when cookies are disabled. Both of these GL Optics zooms have singlehandedly convinced me that I should always have some zoom lenses in my kit. The award-winning SIGMA 18-35mm 1.8 DC HSM Art, the very first F1.8 zoom lens. Hi, I have been using my Sigma 18-35 1. Zooming to change focal length saves time on set I found it especially helpful for getting additional coverage of a scene when time is tight. Sigma 18-35 1.8 Focus Problem - only in view finder focus. I used to be a "prime or die" kind of person, but after seven years of shooting (and one shoulder surgery later), I value the ability to change my focal length on a whim. You can still spot some traces at f/4 although it's not really relevant here anymore.GL Optics Sigma 18-35mm in Lowlight ( Canon C300 Mark ii) The verdict ![]() As to be expected the effect is most pronounced at f/1.8 and decreases the more you stop down. Ive been thinking about my photographic experiences from the last trip and the changes I want to make for the next trip. We are going back the second week in Dec. While not quite as quick as the best from Canon & Nikon, you will have no trouble focusing quickly and tracking fast moving objects. Just like most of ultra-large aperture lenses the Sigma is also affected by this. We usually go every year but this year we built a new house and that depleted our finances so we couldnt swing a trip. ![]() It can show up as purple halos in front of the focus point and greenish halos in the background. While this may not sound impressive, the quality of the blur in the focus transition zone is actually very good (smooth) for a standard zoom lens - both in the background and foreground.īokeh fringing is an axial color fringing effect. "Cat's eyes" in the image corners are not so much of an issue surprisingly although you can spot a slight deterioration at f/1.8. The circular shape remains mostly intact till about f/4 (tested at 35mm). Out-of-focus highlights show a near-circular shape at large aperture settings but the inner zone of these discs is clearly nervous. However, to be fair - this applies to most standard zoom lenses. The Sigma is pretty good but it has its issues here. While not a number game, the quality of the bokeh (out-of-focus blur) is a major aspect for an ultra-large aperture lens. Youll have to adjust the AF by using the dock or in-camera adjustments. They remain below 1px on the average at the image corners at 18mm and 24mm and are negligible at 35mm. Lateral chromatic aberrations (color shadows at harsh contrast transitions) are low and not disturbing. It was recommended to wait for the USB Lens Dock so focus calibrations could be made, so I waited a while. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations The chart shows line widths per picture height (LW/PH) which can be taken as a measure for sharpness. The issue is a complete and utter inability to focus using Phase Detect AF (PDAF). Please note that the MTF results are not directly comparable across the different systems!īelow is a simplified summary of the formal findings. An in-depth lens review of Sigmas acclaimed 18-35mm F1.8 Art Zoom. The centering quality of the tested sample was good. At f/8 you may spot a slight downturn due to diffraction but this is still rather irrelevant here. However, the glory doesn't stop here - the borders are easily on a very good level at large apertures and even touch excellent levels at medium aperture settings. The center performance is already excellent at f/1.8 but downright outstanding between f/2.8 and f/5.6. The Sigma 18-35mm f/1.8 DC HSM | A produced nothing short of stunning resolution figures in the MTF lab. Sigma 18-35 f/1.8 Art Focus Issues Thread Pentax SLR Lens Discussion Sigma 18-35 f/1. However, the issue is mostly resolved at f/2.8 and gone beyond. I have a big problem : I cant mount my manuel Metabones adapter to my CONTAX. This also applies to the Sigma - the vignetting varies around the 1.5EV (f-stop) mark at f/1.8. Ultra-low aperture lenses tend to show heavy light falloff at max. ![]()
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