The 10-20mm F4-5.6 EX DC HSM is Sigma’s providing in the APS-C ultrawide zoom capability industry, first declared in Feb 2005. It was presented amongst a quantity of reports as producers competed to give wideangle zooms for the growing APS-C structure DSLR industry, with identical promotions also showing in brief evaluate from organizations Tamron and Tokina (not to discuss all of the most important electronic camera companies). It has since become an increasingly well-known lens, due in no little part to providing the joint-widest position of perspective of all the APS-C ultra-wide zooms, while being available in installs to fit all of the most important DSLR techniques. Similarly it’s not harm by having a very aggressive price; it’s especially much less expensive than the electronic camera manufacturers’ own promotions in this industry.
The visual system functions 14 components in 10 categories, such as three Super-low Distribution cup components for the minimization of chromatic aberrations, and three aspherical components to decrease distortions and other aberrations. Customers of Cannon, Nikon, Sigma, and Four Thirds electronic cameras advantage from an ultrasonic-type ‘HyperSonic Motor’ (HSM) for quick and quiet auto-focus, while the Pentax and Sony models install editions use the ‘screw-drive’ combining from you whole body. The ‘DC’ status indicates that this lens is developed for DSLRs with APS-C or more compact receptors, and isn’t appropriate for use on a full-frame whole body (the picture group isn’t huge enough, and vignetting will occur).
Of course the marketplace does not take a position still, and Tamron (arguably Sigma’s greatest immediate rival) lately improved its own providing in this industry with the SP AF 10-24mm F3.5-4.5 Di-II LD Aspherical (IF). In the Four Thirds install, Olympus has also joined the field with its very amazing Zuiko Digital ED 9-18mm F4-5.6. And while Sigma has itself lately declared a new continuous highest possible aperture 10-20mm F3.5 EX DC HSM, the signs are that this will offer together with the more slowly design as a higher-priced top quality item. So how does the 10-20mm F4-5.6 take a position up in the head of its new competitors?
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- Features Ultra wideangle zoom capability (15-30mm comparative on 1.5x DX / APS-C DSLRs)
- F4-5.6 highest possible aperture
- Available for Cannon, Nikon, Sigma and Four Thirds installs with built-in HSM concentrating engine, and
- Pentax and Sony models installs with concentrate motivated from electronic camera whole body (non-HSM version)
- For decreased structure (APS-C / DX / Four Thirds) structure DSLRs only
Sigma 10-20mm EX DC HSM Body And Design
The 10-20mm is typical Sigma in design and build, boasting the company’s familiar flat dark ‘zen’ finish. The lens feels solid and durable, with a metal install and an overall impression of quality to the materials and construction; it also appears rather more strong than Tamron’s SP AF 10-24mm F3.5-4.5 Di-II. The structure is entirely traditional, with the main concentrate band to the top part and the zoom capability band to the back, and attention method selection change on one part of the gun barrel (Canon and Sigma install versions).
Lens body elements
- The lens comes in editions for Cannon, Nikon, Pentax and Sony models DSLRs. All of our pictures on this page show the Cannon EF edition, but note that the test data was obtained using a Nikon install lens.
- The narrow line is 77mm. It does not move on autofocusing, which should please narrow customers. Further great news is that normal 8mm-thick polarizers can be used perfectly gladly without vignetting, and the slim-mount kind is not required.
- The petal-type lens bonnet is provided as standard, and fits favorably onto the bayonet install on the top part of the lens. It’s made of dense dark plastic boasting ribbed moldings on the inside to reduce insights of wander light into the lens. In signature Sigma fashion, a group of marks on the outside of the bonnet aid positioning for increasing.
- Unlike the Tamron 10-24mm F3.5-4.5 we analyzed recently, the lens bonnet turns around nicely to give a reasonably lightweight package. With its 95mm size, it should fit gladly in most bags.
- The zoom capability band has a 13mm extensive ribbed rubberized hold, and the activity is sleek and accurate. It moves 50 levels clockwise from ultrawide to wide; the ‘right’ way for Nikon, Pentax and Sony models customers, but reverse to Cannon and Olympus contacts. The front part side element expands just 4mm on cruising from 10 to 20mm.
- The 12mm extensive concentrate band moves 120 levels clockwise from infinity to 0.5m, now related Cannon, Sony models and Olympus contacts but reverse to Nikon and Pentax designs. It does not move during auto-focus, and again the activity is sleek and accurate. The HSM form of the lens functions full-time guide concentrating, allowing the user to modify concentrate even in AF method.
- A basic range range is noticeable in feet and metres, and the main concentrate band moves a little bit past the infinity position. There’s no detail of field range, however. This window is missing from the non-HSM Pentax and Sony models editions, changed by a range range on the (now automatically coupled) concentrate band.
- A large, positive change on one part of the lens gun barrel is used for changing the main concentrate method between auto and guide on Cannon and Sigma install versions.
Sigma 10-20mm EX DC HSM Test Results
The 10-20mm displays important curve of area, meaning that the area of distinct concentrate is not smooth across the structure, but bowl-shaped with the sides bending towards the digicam. This is a issue when examining a lens using smooth maps, as it’s difficult to accomplish appropriate concentrate across the whole graph area at the same time. We have therefore in this situation chosen offer outcomes targeted for maximum sharpness towards the side of the structure (approximately 60% from the center, corresponding to the exterior celebrity in the graph reflection in the gadget above). This gives the best overall impact of the lens’s abilities, although not the biggest possible main sharpness. Click here for a screen taken displaying a pretty common evaluation between the released data (left) and that targeted for maximum center sharpness (right).
Sharpness is usually great during the structure, but is less amazing towards the sides. The lens is sharpest at the long end, and while it’s also very good at 10mm, efficiency is sluggish during the zoom capability range, especially towards the sides. The best possible outcomes are usually obtained on avoiding down to F8 or F11.
Chromatic aberration is extremely well managed, indeed this is the stand apart function of this lens. When existing it tends to be mainly of the creatively less distressing blue/yellow kind, and even then is only really noticeable in the ultimate sides of the structure at wideangle. Very amazing indeed.
We consider falloff to start becoming a potential issue when the area lighting drops to more than 1 quit below the center. Maximum falloff is around 1.3 prevents at all main measures, dropping a little bit on avoiding down, but it’s still around 1 quit by the ultimate sides at F11 (again at all main lengths). This is unlikely to cause any actual issues in actual use.
Distortion is a little great, especially when in comparison to the other wideangle zooms we’ve examined lately. There’s pretty powerful (2.4%) gun barrel distortions at wideangle, with a rather uncommon and sophisticated design, nearby mainly towards the sides of the structure (and therefore challenging to appropriate completely in software). This changes to pincushion distortions at more time main measures, peaking at -1.4% around 14mm.
FX (Full Frame) Coverage
The Nikon, Cannon and Sony models fit editions of this lens will all install on full-frame DSLRs; on Nikon camcorders (D3, D3X, D700) DX plants method will be instantly chosen (and the digicam will therefore capture at decreased resolution). The lens’s picture group doesn’t completely cover Negatives complete structure at any main duration, as proven below; it’s therefore inappropriate even for urgent use on this structure.
Control of surface is a crucial function of a superwide lens; with such an extensive view around the globe, shiny light resources will find themselves in the structure regularly. The Sigma 10-20mm usually provides with this reasonably well, but can run into issues in more complicated conditions.
With the sun placed straight in the structure at wideangle there are usually few really undesirable results, but as is necessary, avoiding down for sharpness or detail of area considerably improves the exposure of surface styles. In these conditions you’ll have to choose your aperture properly, to stability sharpness against surface. A larger issue, though, is seen when capturing towards the sun at more time main lengths.In these conditions it would be recommended to provide more covering to the front factor than offered by the bonnet.
The Cannon, Nikon, Sigma and Four Thirds install editions of this lens use Sigma’s ultrasonic-type HyperSonic engine for concentrating , and in real-world use it works very well, obtaining concentrate quickly and near-silently. This particular system is also of the ring-type, which provides several advantages; the guide concentrate band does not move during auto-focus, and concentrate can also be improved personally with the lens set to AF. This is certainly a major plus for this lens over its opponents (in this category only Cannon and Nikon’s more expensive promotions function something similar). The HSM engine also allows the lens to pay attention to Nikon’s entry-level DSLR systems (D40 / D40X / D60).
Chromatic aberration is especially low on this lens, and the illustrations below demonstrate that even in the most severe situation, there’s really very little to bother about. The only minor hiccup is the rather complicated shape of the CA information at wideangle, meaning that the colour of the fringing differs across the structure (being red/cyan towards the advantage, but blue/yellow in the ultimate corner), making it somewhat challenging to appropriate completely in application if required.
The example below demonstrates this, on the remaining we have a RAW taken prepared with no chromatic aberration modification, and on the right the corresponding JPEG from the Nikon D300 (this digital camera’s automated CA modification functions as a useful proxies for the kind of result you might anticipate to accomplish in application using Photoshop’s ‘Lens Correction’ narrow, or any identical device which depends on basically re-scaling the shade channels). In this situation the red/cyan advantage on the remaining side of the structure is near-perfectly fixed, but the blue/yellow advantage in the top right area is not. As nowhere route CA information is extremely non-linear, solving the fringing in the area would basically present new issues elsewhere in the structure.
Sigma 10-20mm EX DC HSM Specifications
|Street price||• US: $440
• UK: £400
|Date introduced||February 2005|
|Maximum format size||APS-C/DX|
|35mm equivalent focal length||• 15-30mm (1.5x DX)
• 16-32mm (1.6x APS-C)
• 17-34mm (1.7x Sigma SA)
• 20-40mm (2.0x Four Thirds)
|Diagonal Angle of view (APS-C)||109º – 60º|
|Lens Construction||• 14 elements/10 groups
• 3 SLD glass elements
• 2 hybrid aspherical elements
• 1 glass mold aspherical element
|Number of diaphragm blades||6, rounded|
|AF motor type||• Ring-type Hypersonic Motor (Canon, Nikon, Sigma, Four Thirds)
• Full-time manual focus
|Filter thread||• 77mm
• Does not rotate on focus
|Supplied accessories*||• Front and rear caps
• Lens Hood
|Weight||470 g (16.6 oz)|
|Dimensions||83.5 mm diameter x 81 mm length
(3.3 x 3.2 in)
|Lens Mount||Canon, Nikon, Pentax, Sigma, Sony, Four Thirds|