Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens

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This Unique Lens Enables You to Create a Variety of Unusual Compositions

Sigma 15mm F2.8 EX DG Fisheye Lens

The Sigma 15mm f/2.8 EX DG Diagonal Fisheye is a full-frame fisheye auto focus lens that fills the entire 35mm negative with a full 180 diagonal field of view. This unique lens enables you to create a variety of unusual compositions even when shooting ordinary subjects.

The improved DG lens coating reduces flare and ghosting, which is a common problem of digital cameras, and also creates an optimum color balance.

Since most Digital SLR cameras use a smaller image sensor size (APS-C) than 35mm film cameras, 180 angle-of-view can not be obtained with Digital SLR cameras. With those cameras only the center part of the frame is used, therefore, peripheral distortion will be very small.

The super wide angle of this lens makes it ideal for use with digital SLR cameras, providing a focal view of approximately 23mm.

This digitally optimized diagonal fisheye lens is equipped with a new multi-layer coating technology that reduces both flare and ghosting. This also ensures an accurate color balance and high definition results.

With a minimum shooting distance of only 15cm (5.9 inch), this lens has a maximum magnification of 1:3.8. The close focusing capability together with a large depth of field allow close up photography that covers objects surrounding the photographic subject.

This lens is supplied with a gelatin filter holder at the rear, and a fitted padded case.

Note: this lens has no built-in motor and will not autofocus on the Nikon D40/D40x, Nikon D60, Nikon D3000, Nikon D3100 or the Nikon D5000 Cameras.

A fisheye lens captures a wide, hemispherical image on the extreme side. Initially developed for meteorology use in studying formations of clouds and labeled as "whole-sky lenses", these fisheye lenses fast became popular for all around photography because of the unique, distorted appearance of photographs they captured . They are typically used by photographers acquiring broad landscapes that suggest the earth's curve. Hemispherical photography is also used for an array scientific purposes in studying the geometry of plant canopy and for calculating solar radiation near the ground. The first fisheye lenses which were created were "circular fisheyes" type lenses which capture a 180 hemisphere which shows as being a circle within a film or sensor frame. A few circular fisheyes can be acquired in orthographic projection versions for scientific applications. These lenses feature a 180 vertical viewing angle, while the diagonal and horizontal viewing angle are also 180. The typical circular fisheye lens covers a lesser image circle as compared to rectilinear lenses, allowing the frame corners to be completely dark.

Features

New multi-layer lens coating and lens design reduce flare and ghostin

High definition for film and digital SLR cameras

Minimum Shooting Distance of 15cm (5.9in.)

Equipped with rear-filter mechanism

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Specifications
Overview
Lens stylePrime lens
Max Format Size 35mm FF  
Lens focal length15 mm  
Stabilization type No  
Camera mount Canon EF, Nikon F (FX), Pentax KAF, Sony Alpha, Sigma SA  
Angle of view 180  
Aperture (lens diaphragm)
Largest aperture opening F2.8  
Smallest aperture opening F22.0  
Includes aperture ring No  
Total diaphragm blades 7  
Optical
Total Elements 7  
Number of Groups 6  
Focusing
Minimum focus distance 0.15 m (5.91")  
Maximum magnification ratio 0.26 x  
Autofocus type Yes  
Lens motor Micromotor  
Full time manual focus Unknown  
Focus notes screw drive for nikon mount  
Physical features
Overall weight370 g (0.82 lb)  
Lens diameter 74 mm (2.89")  
Overall length 65 mm (2.56")  
Sealing No  
Lens color Black  
Filter annotations rear gelatin filter  
Lens hood included Yes  
Lens hood code built-in hood  
Tripod collar included No


Lens Includes
Gelatin filter holder at the rear
Fitted Padded Case
Built-In Lens Hood
1-Year Worldwide Warranty, 3-Year Extended USA Warranty
AF not supported for Nikon D40 and D60 , D3000, and D5000cameras.
Accessories

Reviews
Use your brain and the right camera, July 4, 2007

By In the Middle of the Road (Connecticut)

This is an excellent lens that does exactly what it's supposed to do. Optically, it's also excellent. You need to think seriously about whether you know what you're doing or anything about photography if you buy this for a Canon digital camera that's less than full frame.

You should probably stick to point and shoots until you understand lens conversion factors. If you don't understand digital crop factors and can't read basic specs, you either need to hold your money or find a dealer that you can trust to explain it to you. But the manufacturer shouldn't be accused of making a bad product because you don't understand the specs.

A previous user gives a poor rating because he either didn't read or understand the lens specifications. The rating was retain while most of the review was deleted because it simply didn't make sense. If you tried to use a 8x10 wide angle lens on a digital slr camera, you'd end up with a super telephoto because you're only using a portion of the image circle. Someone who calls this lens worthless because he bought first and thought later is blaming Sigma for his lack of attention to the laws of optics and of physics.

When you buy lenses for digital cameras, you have to take your brains out of your boots. This is a fisheye lens that's excellent on digital cameras, You Best Prices for the full fisheye effect on a full frame digital camera --- OR at full 35 mm. You don't Best Prices for the same effect on most DSLRS. When Panasonic Lumix claims 28mm lens width in its new line, it's not serious, but is referring to the apparent focal length when compared to 35mm film.

The lens can be used on cameras like the 20D or 30D which have a 1.6x crop factor. The news high speed top End EOS 1D Mark III will also have a crop factor of 1.3 while the 1ds and 5D are both full frame and will take full advantage of the 180 degree (on the diagonal) that this lens and other fisheyes offer. This lens is very good close to the optical quality of the Canon fisheye -- I've used both. But the game here is the intentional distortion on full frame. A standard wide-angle of this focal length does not cover 180, but something around 112 degrees -- on full frame.

If you want an equivalent of the 16-35 used a 5D on your 30d, you need to Best Prices for the 10-22. Both are rectilinear, corrected for distortion. Even the high end 1D doesn't get flll benefit of the fisheye due to crop factor. There are optical gimmicks if you want the effect, but that's not appropriate here.

The build quality of this lens is very good, not quite up to the level of the top drawer (and expensive) L lenses, but it is equal to Canon lenses for about the same price. It's difficult to use filters on this lens-- it isn't designed for them and filters would be makeshift -- and that big front element is vulnerable as with all of the real fisheyes. There are a couple of quirks that take a little getting used to in the controls for a regular Canon user.But I find it a little tricky going back to Leicas after too much time away -- and their controls vary with product. The images are high quality and a reasonably skilled photographer can produce excellent work with this lens without relyin entirely on fisheye cliches.

Users of digital cameras with crop factors should consider the shortest focal length fisheye lenses, approx 8 millimenters which also producs a 180 degree image, but in a circle. While I don't Best Prices for the circular image on the 20D that I do the 5D it does give a lot of the distortion and on the diagonal approaches 180 with the rectagular image. I haven't measure it and don't have a reason.

The Sigma in a custom mount might produce interesting circular images on medium format film or digital sensors, but that would involve a careful matching of the mount to focal plane location. It is usually a waste of money to buy high end full frame lenses in shorter focal lengths for smaller digital sensors. You're paying for a lot of glass designed to cover a larger frame.


A GREAT Lens......PERIOD!, April 6, 2008

By R. W. Strauss "FreeMan" (Portland, OR)

I bought this lens on a lark, and have enjoyed every second of my time owning it. I use it on my Canon 5D and on my Canon 40D, if I set my shots correctly, I have some of the most unusual, attractive and impressive shots in my Shot Library.

The key to success with this lens is to set the shot correctly. I have found it takes more planning, a steadier hand (or Tripod/Monopod), than even my 100-400MM F/4-5.6L. With a telephoto lens, your area of focus is less a challenge than the 180 Degree worth of study when dealing with this lens.

Don't get me wrong, this lens is FUN!! I've never enjoyed landscapes, portraits, artistic shots more than I have when I am using my 15MM Fish. For the Casual user, high end amateur, or for the seasoned professional, this lens is an inexpensive TOOL each of us should have to round out our lens bag. BUY IT!!

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Sigma 15mm f/2.8 EX DG Diagonal Fisheye Lens

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