Reviews and Problems with Sigma 20mm F1.8 EX DG ASPHERICAL RF
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It does the job
David, B&H Photo
20 October 2014
Excerpt: This is one of does Sigma lenses that some love and some hate. I personally think it's good but not perfect. It does produce decent images at it's widest aperture but when you stop it down the image quality improves.If you're in to astrophotography like I am and you don't mind all the massive coma in the frame (at F/1.8) then you should have a look into this lens.
Pros: Colors And Contrast, F18, Large aperture, Sharp, Strong Construction
Cons: Blurry Focus, Not so sharp wide open, Slow Focus, Soft wide open, Vignetting
Summary: Overall its a good lens. auto-focus is pretty crappy sometimes when you're trying to catch something fast. Loud autofocus when its on video mode, but manual focusing is pretty quiet and smooth. Pictures come out clear, get a good wide angle without distortion like a fish-eye lens. Bought over a year ago, used frequently, and still lasting good.
Summary: Huge Objective for Light Gathering! I Don't Manually Focus Very Often My Judgement is Not That Good with My Eyes Anymore. Sometimes Hunts A Long Time to Focus in Auto Mode! But That's Rare, Most of the Time... Fine! I Do a Lot of Close-Up and Sometimes Large Group Candids. Perfect Lens for This!
Good value for the money, especially for the DSLR videographer on a budget.
6 June 2012
Summary: This is a solid lens. I would recommend it to new and ametuer consumers -- for the money, the picture is hard to beat. I use it primarily for video when I want a wider shot than my Canon 50mm f/1.8. The lens provides clear shots at wide angles. It is not quite as wide as the Tokina 11-16 f/2.8, which will get the whole room in the shot, but then again, I got it for 1/2 the price of that lens (which retails for about $600) and the Tokina is not a prime and is only f/2.8.
Excerpt: I use this lens for portraits, it is great for that. having the lens set at 1.8f is very difficult to make the image sharp. Very nice Bokeh. sometimes has slow focusing. all in all it is a nice lens and extremely durable.
Excerpt: As a landscape Photographer I did not own a lens that was faster than F4 and for AstroPhotography I needed to have a faster lens 2.8 or below for my Canon 5DmkII. After reviewing both the Canon and Sigma and "cost", I bought the 20mm 1.8 and have been very happy with the both the timelapse and still images. It's amazing the difference that a 1.8 makes when recording the stars in the Arizona desert.
Pros: Consistent Output, Durable, Easily Interchangeable, Fast / accurate auto-focus, Rugged, Strong Construction
Excerpt: Works great for video work on my Sony FS-100. Love the FoV it gives. Only "complaints" with this lens is that it's a little heavy and when on manual focus the focusing ring makes a noise that almost makes you think it's broken. I looked into this and apparently it's normal. Your sound guy won't pick it up, but it just sounds wrong haha. But otherwise, superb lens. Great IQ!
Excerpt: A little soft fully wide open but fine for my video needs on Canon 60D and 7D. The low light ability makes it a great investment in your lens kit if you can afford to add it. I think it's the best deal out there for a low light prime wide.