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Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE lens
 

Imagine proiectată în mărime naturală

Obiectivele care creează imagini proiectate APS-C sunt dezvoltate pentru aparatele de fotografiat digitale. Ele nu pot fi folosite cu aparate care au senzor de imagine mai mare ca şi formatul APS-C. Aceste obiective nu sunt compatibile cu aparatele de fotografiat pe bază de film.

 

AF neultrasonic

Obiectivele cu mecanism de focalizare ultrasonică tind să fie mai silenţioase şi mai rapide decât cele cu focalizare tradiţională.

 

No stepping motor AF

Lenses with stepping motor focusing mechanism are better for contrast based focusing, and are quiter and faster than traditionally focusing lenses.

 

Fără lentilă cu dispersie joasă

Lentilele cu dispersie joasă ajută la reducerea aberaţiei cromatice.

 

Fără stabilizator de imagine

Stabilizarea imaginii ajută la reducerea neclarităţii cauzată de tremurul mâinii, în special la distanţă focală mare sau în situaţii de iluminaţie slabă. Stabilizarea imaginii poate avea un avantaj de la 1 la 3 trepte în comparaţie cu obiectivele nestabilizate, bazate pe regula reciprocă.

 

Montură metalica

Obiectivele ieftine de obicei sunt echipate cu montură din plastic, iar cele mai scumpe, obiective profesionale, cu montură din metal. În general monturele din metal sunt mai durabile, şi sunt mai rezistente la desele schimbări de obiective. Când un aparat de fotografiat este folosit îndeosebi cu un obiectiv, materialul monturii nu este aşa de important.

 

Fără focalizare internă

Pe durata focalizării lentilele cu focalizare internă nu-şi schimbă mărimea.

 

Lentilă frontală nu se roteşte

Lentilă frontală fixă nu se roteşte în timpul focusării şi/sau a zoom-ului. Aceasta permite fotografului folosirea parasolarului sub formă de petală. Lentilă frontală fixă uşurează folosirea filtrului de polarizare.

 

Cu retro filtru

Retro filtrele sunt utilizate la obiective cu lentile frontale cu diametru mare, sau la obiective superangulare, astfel nu se pot folosi filtre frontale. Retro filtrele se folosesc la obiective ultra superangulare sau la teleobiective cu distanţe focale marî.

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Specificaţie

Monturi disponibile Canon EF, Nikon F, Pentax K, Sony / Minolta A, Sigma
Aplicaţii Close-up , Peisaj, Efecte speciale
Categorii Ochi de peşte, Ultra superangular
Multiplicator
Stabilizator nu
Distanţa focală 15 mm (fix)
Contrucţia obiectivuluj 7 elemente în 6 grupe
Unghi de deschidere 35mm: 180°
digital: 98°
Număr de lamele ale diafragmei 7
Apertura maximă f/2,8
Apertura minimă f/22
Cea mai mică distanţă de focalizare marcată 15 cm
Mărire 0,33×
Mărime filtru Datele nu sunt disponibile
Mărime ∅ 73.5 × 65 mm
Greutate 370 g
Comentarii
Viteză AF Datele nu sunt disponibile
Sunet AF
Focalizare internă nu
Zoom intern Datele nu sunt disponibile
Lentilă frontală fixă da
Tip montură metal
Rezistenţă la umiditate şi praf Datele nu sunt disponibile
Retro filtru da
AF ultrasonic nu
Stepping motor AF nu
Imagine ciculară proiectată de mărime APS-C nu
Lentilă cu dispersie redusă nu
Toc obiectiv Datele nu sunt disponibile
Husă obiectiv Datele nu sunt disponibile
Parasolar Datele nu sunt disponibile
Adaptor trepied Datele nu sunt disponibile
Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Specificaţie

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Teste

Other reviews

Nu sunt teste de listat

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE în ştiri

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Testul utilizatorului

Cele mai utile teste utilizatori de pe Amazon

It's actually a very good lens!

6 May 2007

Hi, I just wanted to give this lens a fair review. As the other reviewer mentioned, if you use it with an APS-C sensor digital slr, you won't see a whole lot of distortion. It's no different from the Canon brand fisheye on a camera like that. But, if you use it with film, or with a larger sensor size camera, full-frame if possible, it's really quite a beautiful, sharp, and very fish-eyed lens. On a Canon 5D it performed really well for me. I just wanted to say that on the right camera, it's really quite a lens.

Use your brain and the right camera

5 July 2007

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 get the full fisheye effect on a full frame digital camera --- OR at full 35 mm. You don't get 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 buy 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 get 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.

worthless

22 April 2007

If you are trying to use this product with a dslr like I was, dont expect to see distortion. For the price go with an 8mm fish.

Incredible Lens

12 August 2007

This lens is really incredible... The quality has always been great with Sigma and this lens is as great as Sigma's reputation...
If you plan to use this lens with a Digital Camera, do not forget that there is a x1.2 coefficient (this lens is a 15mm but used on a Digital Camera, it turns into a 18 or 20mm). If you want the effect of a fisheye (180degrees), consider buying a shorter lens (8mm).
The 15mm fisheye from Sigma is a great super wide angle if used on a digital camera...

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Fotografii mostre

Sigma 15mm f/2.8 EX DG DIAGONAL FISHEYE Accesorii

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