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There was little, if any, coma, the aberration that flares stars into winged seagulls, and only a small degree of lateral chromatic aberration that adds colorful fringes to stars. Performance was consistent at all corners; there was no sign of defective lens de-centering. Comparison of the new TTArtisan 11mm to the old Canon 15mm and current Rokinon 12mm for off-axis star images wide open at f/2.8. Credit: Alan Dyer I haven’t used this one. In terms of weight and size it sits inbetween the aforementioned AstrHori and this TTArtisan lens. The thing that most obviously lets the TTArtisan 11mm f/2.8 fisheye lens down – or at least my particular copy – is the decentered optics. Shooting at f/2.8 it is a little disappointing to see some softness toward the right hand side fo the frame. This isn’t the first time I have seen or heard of this when talking about the new “Artisan/s” brands of lens coming out of China either. Would this put me off buying this lens? I’m not sure. I really do think it would depend on my goals. The excellent optical design of 11 elements in 7 groups has successfully improved the soft edge of fisheye lens. Proper rangefinder focusing would make all of this simpler, at least on an M, whose EVF and live view are stuttery messes. Other mirrorless cameras fare better, but not better enough to ensure reliable focus speed and accuracy. Yes, zone focusing works fine. Yes, stopping down yields deep focus. But none of that is as accurate or fast as focusing through a discrete rangefinder.
As shown in the example above it is also possible to defish fisheye pictures. Defishing means removing the typical fisheye distortion in post. Here the image is stretched so much, the resulting image quality leaves a lot to be desired. If you want straight lines in your pictures better get a rectilinear ultra wide angle lens in the first place. Handling / Build Quality AstrHori 12mm 2.8 Fisheye When shot wide open at f/2.8 the old Canon 15mm was rife with coma at the corners. The Rokinon 12mm had less off-axis coma than the Canon but it was mixed with some astigmatism and softness. The TTArtisan had worse astigmatism than the Rokinon but crisper star images overall. Stopping down the lenses to f/4 improves the lenses’ performance but some astigmatism remains in the TTArtisan. Credit: Alan DyerThe TTArtisan 11mm f/2.8 Fisheye is a manual focus lens that delivers 180° across the diagonal of the frame, what is sometimes called a "full frame fisheye." Full frame in that instance means that the fisheye produces image data all the way into the corners of the frame, and not a circular image as traditional fisheyes do. But this is not the whole story, without going too much into detail of different fisheye projections (you can do that here or here) the shape of objects closer to the corners stays closer to what they actually are. You can see that in the comparison above, the reflection of the lamp is round in the fisheye image while it is streched in the image of the rectilinear lens. So, depending on what part of the image you look at, the distortion of a fisheye lens may actually be less, not more. At 15.4 ounces (436g), the lens isn't light, but it's also not exactly what I'd call heavy, either. The smallish size and metal construction mean that it feels a bit "dense" in the hand.
Le plugin corrige votre image fisheye avec un algorithme complexe en minimisant la distorsion et en maximisant la preservation des détails de l’image The lens seems to be mostly made from metal and all the markings are engraved and filled with paint. A metal slip on lens cap is included as well, it is padded on the inside so won’t scratch the lens. The TTArtisan 11mm 2.8 is a diagonal fisheye, meaning it covers a field of view of 180° diagonally. There are also circular fisheyes that cover only a round image with a field of view of 180° in all directions. The sun stars created by this lens stopped down past f/8 almost look too good at times; you get 14 very distinct rays that are well disciplined. However, at lower aperture values, the stars can be a smear mess, and if you're diffracting the light source too much on an edge, things also get messy.Add to that the following problem: I no longer have the accessory EVF. I hated using it. The M’s live view is pants, going too fast to jello, slowing way down in low light, and getting in the way of other, more important accessories. A fish-eye is also great for taking in the Milky Way from horizon to horizon and for circumpolar star trails. I’ve also used such lenses during total solar eclipses to capture the passage of the Moon’s shadow across the sky. A rectilinear mapping like with Lightroom lens profile will discard approximately one third of the pixels and distord your subject near the edges. The Fisheye-Hemi plugin uses almost all of the pixels.
Très simplement, faites d’abord toutes vos correction de luminosité, couleur puis Exporter en utilisant le plugin Fisheye-Hemi avec l’option Full frameMy second outing with TTArtisan 11mm f/2.8 fisheye lens would prove to be a lot more entertaining. I decided I wanted to push the envelope of conventional fisheye photography (if there is such a thing) and take some portraits whilst out on a photowalk. The results speak for themselves. Architecture was my next idea to shoot with the TTArtisan 11mm f/2.8 fisheye. I wanted to get a really bloody tall building entirely in frame from an unusually close distance. There’s a tall spire right near my work, so I made a beeline for it. In the end, I found that even as close as maybe 15-20m from the bottom I could get it all in, so I decided to frame in some tree to help draw the eye. I think it worked too. What’s interesting about this shot to me is that at f/5.6 you can see the effect of the softening down one side of the frame is no longer an issue. Also similar to the Voigtlander UWA primes and some of the wide Laowa primes ( 12mm 2.8 and 15mm 2.0) this lens shows some slight green color cast in the corners which can become visible with bright skies. Sharpness infinity Focusing and aperture rings are smooth but a little bit too tight for my taste (some like it that way), I have the feeling they will loosen in the future
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