Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
by SIGMA
Our Price: $629.00
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Category: Digital Camera
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Digital Photo Product Details
Manufacturer: SIGMAModel: B00005RKSN
Accessories:
- AmazonBasics Universal Camera Case for Digital Cameras HF (Black)
- Corel Photo & Video Pro X3 Bundle [Old Version]
- AmazonBasics Camcorder/Camera Bag with Shoulder Strap (Black)
- Purosol All Natural Lens Cleaner 2oz.
- Purosol All Natural Lens Cleaner 1oz.
Digital Cameras Photo Reviews of Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
Customer Review: Bulky but very useful for available-light shooting
Summary: 4 Stars
I had been using a Pentax-M 50mm f/1.4 and loved the ability to shoot in low light. However, the -M lenses are manual focus and manual aperture, and I was getting too many out-of-focus shots that I regretted missing (I'm taking a lot of baby shots lately). So I decided to get a full-auto fast prime, and I was looking at this and it's 24mm and 28mm cousins.
The lens works beautifully. It's a tank and feels well-built. Not as tight as an all-metal lens, but solid nonetheless. If you note, the 20mm doesn't have a macro mode - the 24mm and 28mm do. Really, it focuses very close without any problems, but at this focal length it's kind of silly to be thinking 'macro photography' anyway.
The 30mm effective focal length is a tad wide even for indoor close-quarters shots. If I had to decide again, I'd probably opt for the 24mm or possibly even the 28mm - the effective focal lengths would be a little more practical for my purposes. However, if you want to take in a lot of scenery and need a fast lens, this fits the bill without venturing into the fisheye territory.
Optically, I was disappointed at first, because I was getting soft pictures when it's wide open, even when on a tripod. But then I did a focus test and found my camera was back-focusing. I have a K10D, so you have to do some trickery to adjust the focus (search online and you can find out how), but afterward, I'm getting acceptably sharp images.
And, for the record, my camera says the aperture opens to f/1.7 - not that I'm complaining.
I give it just 4 stars, though, because when compared with my Pentax-M 50mm f/1.4 when they're both wide-open, the old 50mm is noticeably sharper. From what I've heard, you have to spend the cash for one of the Pentax limited lenses to get the same quality in an auto focus lens as with their old -M and -A glass. So, for about half the price of a limited lens, you're getting a good deal.
Description of Sigma 20mm f/1.8 EX DG RF Aspherical Wide Angle Lens for Pentax and Samsung SLR Cameras
This super-wide-angle lens is ensured minimal light-fall-off with superior peripheral brightness. The iris diaphragm has 9 diaphragm blades to obtain beautiful out of focus images in the foreground and background. This is an ideal DG lens optimized Digital SLR camera. Minimum focus distance The minimum focusing distance of this lens is 20cm (7.9 inch) and it has maximum magnification of 1:4 with fast F 1.8 maximum aperture. The minimum focusing distance of 20cm (7.9 inch) and 94.5? angle of view allow close up photography surrounding the photographic subject. Handling The lens incorporates Dual-Focus (DF) mechanism. It is easy to hold the lens, since the focusing ring does not rotate during auto-focus, yet it provides adequate focusing torque of the focusing ring during manual focusing of the lens. The rear focus system eliminates the need for the front of the lens to rotate, thus allowing the use of a Petal-type hood, which is superior light blocking effect. Incorporated aspherical lenses The use of aspherical lens elements in both of the front and rear lens groups effectively compensates for distortion, spherical aberration and astigmatism.Lenses
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