18

HomeDonateNewSearchGalleryReviewsHow-ToBooksLinksWorkshops AboutContact Sigma 18-35mm f/1.8 (only for APS-C, 2013-) © 2013 hoanglamcm.net. All rights reserved. Bạn đang xem: 18 Intro Specifications Performance Recommendations Sigma 18-35mm f/1.8 DC, Nikon version (will not cover full frame; DX & APS-C coverage only, 72mm filters, 28.5 oz./809g, 0.92"/0.28m close focus, about $800. Also comes in Canon EOS, Sony Alpha, Pentax và Sigma mounts.) The biggest source of tư vấn for this free website is when you use these links, especially this links directly khổng lồ this lens at Adorama and this links to it at Amazon, when you get anything, regardless of the country in which you live. It helps me keep adding lớn this free website when you get yours through these link — but I receive nothing for my efforts if you buy elsewhere. Thanks for your support! Ken. December 2013 Sigma đánh giá NikonCanonLEICAPentax Sony Sample Image Files (more are in the review) Canary Palm at f/1.8 at 18mm. 24MP DX Nikon D7100, f/1.8 at 1/800 at ISO 100. Full-resolution (5 MB; the palm isn"t flat so much isn"t in focus). Canary Palm at f/1.8 at 35mm. 24MP DX Nikon D7100, f/1.8 at 1/640 at ISO 100. Camera-original LARGE BASIC JPG (5 MB; the palm isn"t flat so much isn"t in focus). Introductiontop Intro Specifications Performance Recommendations Adorama pays top dollar for your used gear. B&H Photo - clip - Pro Audio

This Sigma 18-35mm f/1.8 is an optically superb lens, but it"s also much bigger and heavier than similar fixed lenses lượt thích the superb Nikon 35mm f/1.8 DX. The 18-35mm zoom range only works out lớn be equivalent to lớn about 28-55mm on full-frame; not exactly more useful than a fixed lens.

Optically this lens is extraordinary —but it"s too big & heavy, has a silly zoom range, và I have little confidence that this lens will work with whatever camera I"m using ten years from now. When I invest in pro lenses from Canon, LEICA & Nikon, I know they"ll still be performing decades from now. All my Canon, LEICA and Nikon lenses from 25 years ago still work perfectly today, while I have older Sigma lenses that work on cameras of their vintage, but not on today"s cameras. Likewise, my repairman has had too much experience with 7-year old Sigma lenses for which parts aren"t available, making those expensive Sigma lenses into paperweights, while the pro brands are easy lớn service.

If you don"t mind the weight and don"t worry about the future, the Sigma 18-35mm works fantastically well today. This 18-35mm f/1.8 is ultrasharp at every setting, even wide-open.

Focus is silent, và you may grab the ring at any time for instant manual focus override. At least on the Nikon version I tried, Sigma finally has this figured out.

Specifications top

Intro Specifications Performance Recommendations

Nametop

Sigma calls this the Sigma 18-35mm F1.8 DC A.

DC: Won"t work on full-frame; only works on APS-C format cameras.

A: "Art" series, just kinh doanh BS.

Opticstop

17 elements in 12 groups.

Aspherical. Look at the reflections from the front element and you"ll see just how wildly aspherical it is.

Multicoated mostly in yellow-green.

Internal focusing. Nothing moves externally as focused.

Diaphragmtop

Sigma 18-35mm f/1.8.

9 rounded blades.

Stops down to f/16.

Very round at large apertures, while still giving great sunstars stopped down. Bravo!

Coveragetop

DX and APS-C, only.

Won"t work well on 35mm film, Full-Frame or FX; the corners will be black at any setting wider than 28mm.

Focal Lengthtop

18-35mm.

When used on a DX or APS-C camera, it sees an angle of view similar khổng lồ what a 28-55mm lens sees when used on an FX or 35mm camera.

Angle of Viewtop

76.5 ~ 44.2° diagonally.

Close Focustop

0.92 foot (0.28 meters) from the image plane.

Maximum Reproduction Ratiotop

1:4.3 (0.23x).

Hard Infinity Focus Stop?top

No.

You have lớn let the AF system focus at infinity.

Focus Scaletop

Yes, but pretty much illegible.

Depth-of-Field Scaletop

None.

Infra-Red Focus Indextop

None.

Xem thêm: Sa Kê: Tác Dụng Của Lá Sa Kê Khô, 5 Công Dụng Của Lá Sake Tươi, Khô

Aperture Ringtop

No.

Filter Threadtop

72 mm, plastic.

Does not move.

Sizetop

Sigma specifies 3.07" (77.9 mm) diameter by 4.76" (120.9 mm) extension from flange.

Weighttop

28.520 oz. (808.55g), actual measured.

Sigma specifies 28.2 oz. (800 g).

Hoodtop

LH-780-06 Hood on Sigma 18-35mm f/1.8 DC.

Plastic LH-780-06 bayonet hood, included.

Casetop

Case, Sigma 18-35mm f/1.8 DC.

Nice padded nylon case included.

Includedtop

Lens, caps and hood.

Case.

Paperwork.

Made in top

Lens made in Japan.

Warranty top

1 year.

Sigma USA"s website implies 3 years for the USA.

Packagingtop

trắng cardboard box.

Box, Sigma 18-35mm f/1.8 DC.

In this box sits the lens inside a plastic bag which sits with the hood inside the case. The case is the padding - there is no foam.

Announcedtop

Summer 2013.

Availabletop

November 2013.

Price, USAtop

August-December 2013: $800.

Sigma 18-35mm f/1.8 DC. enlarge.

Performancetop

Intro Specifications Performance Recommendations

OverallAutofocus Bokeh color Coma

Distortion Ergonomics Falloff Filters

Focus Breathing Ghosts Hood Lateral màu sắc Fringes

MacroMechanics Sharpness Sunstars

Overall performance top

The Sigma 18-35mm f/1.8 DC has fantastic optics — but its mechanics & potential camera incompatibility are why you pay less for Sigma than for professional Nikon or Canon lenses.

Autofocus performance top

Overall

AF works great on my Nikon D7100.

It"s fast enough và super-accurate so that I can take advantage of this lens" great sharpness at f/1.8.

AF Speed

AF speed is plenty fast.

AF Accuracy

On my Nikon D7100, AF was dead-on for every frame, especially shot at f/1.8 where this is critical.

Manual Focus

Manual focus is swell, just grab the ring at any time.

Manual Focus Override

Manual focus override works great, at least on the Nikon version I tried.

Bokeh performance top

Bokeh, the character of out of focus backgrounds, is pretty good. Backgrounds go soft and never distract.

Color Rendition performance top

The color rendition seems about the same as my Nikkor AF lenses.

Coma performance top

Coma (saggital coma flare) often causes weird smeared blobs khổng lồ appear around bright points of light in the corners of fast or wide lenses at large apertures. In lenses that have it, coma goes away as stopped down.

I saw no coma with this aspherical lens! Whoo hoo; coma has always been the weak point of fast wide zoom lenses, và Sigma made it go away. As you can see in this photo, points of light stay as points. Bravo!

Christmas Lights at f/1.8. Nikon D7100, 18-35mm at 18mm, f/1.8 at 1/30 at ISO 1,400. Full-resolution file.

Distortion performance top

The Sigma 18-35mm f/1.8 DC has moderately strong barrel distortion at the wider end and moderately strong pincushion distortion at the longer end.

No Nikon or Canon camera will be able lớn correct this automatically, as many of these cameras can bởi for their own-brand lenses today. What you get is what you get unless you want lớn much with it in Photoshop.

Most of the distortion can be corrected by plugging these figures into Photoshop"s lens distortion filter. These aren"t facts or specifications, they are the results of my research that requires hours of photography and calculations on the resulting data.