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Chromatic Aberration: Longitudinal CA is low, lower than I would have expected. This is good news, because makes the lateral CA you'll clearly see at wide apertures easily correctable. The 11mm I tested was for Canon’s mirrorless RF lens mount, but versions of the same lens are available for Nikon Z, Sony E, and Leica L and M mounts.
The bad news begins when you mount it on an M. TT Artisans left out rangefinder coupling. Therefore, if you have a film M, or a CCD digital M, you’ll have to guess your way to focus along hyperlocal lines. Even if your M does the live view or EVF thing, it renders the included framing finder pointless, not to mention, relies on the digital M’s terrible live view system. Yes, I understand that its field of view is too wide for the M’s focus/framing window. Yes, I understand that, as a super wide-angle fisheye lens, most things are in focus anyway. But a lens made for a mount should support the most basic function set of that mount. I am disappointed. Ok, so experiences out of the way, time for some practical thoughts on TTArtisan 11mm f/2.8 fisheye lens. There really is no denying that this lens is highly unconventional. It is designed for a system that – at least until the introduction of the M240 and M10/-P with their live view screens and add-on Visoflex viewfinders – is really quite unsuitable for fisheye photography. As far as I know, there is no optical view finder available for this lens, so short of fudging one out of a door peephole or the like, framing with this lens with most M-Mount cameras is going to be based on guesswork.The excellent optical design of 11 elements in 7 groups has successfully improved the soft edge of fisheye lens. While Artisans’s 35/2 fairly impressed me, the 11/2,8 is tighter still. Its focus ring turns on a hermetic helical over 90 degrees, that, considering the view angle, is enough to achieve accurate focus from infinity to 0,17 metres. In comparison to a classic Voigtlander, or Leica, the twisting action is positively sandy, but next to a number of twenty year old Zeiss lenses, not to mention loads of lenses from China and Russia, it is perfectly acceptable. Open full-size image in new tab. Same image at f/3.5 with 200% zoomed-in crop boxes showing star performance. Huge improvement in sharpness of stars in corners/edge. Still some chromatic abberation and coma, but not obtrusive. Open full-size image in new tab. 2 min. single exposure at f/4, ISO 1600, Canon EOS Ra, Bortle 3 sky. Stopped down to f/4 all the lenses improved at the corners, though the TTArtisan still showed some astigmatism. The Rokinon 12mm does provide a slightly wider field of view than the 11mm TTArtisan, despite its 1mm longer focal length. As far as I know only 3 different diagonal fish eye lenses designed for fulIframe sensors have been released yet (as of Dec. 2022): the 7Artisans 10mm 2.8, the TTArtisan 11mm 2.8 and this AstrHori 12mm 2.8. They are all similarly priced but their weight and dimensions differ noticeably. This AstrHori one is by far the biggest and heaviest, so I would also expect it to perform the best.
Le plugin corrige votre image fisheye avec un algorithme complexe en minimisant la distorsion et en maximisant la preservation des détails de l’imageMy first couple of shots were mostly an exercise in attempting to understand the specifications in practice. When you’re only used to shooting with lenses as wide as 18mm, having something with this field-of-view initially feels quite jarring. And that’s before you take into account the fact that it’s a fisheye optic. The TTArtisan 11mm fisheye isn’t rangefinder coupled either, so focusing took a moment to acclimatise to as well. In terms of the color scheme this looks very much like a Leica M lens including the famous red dot. Markings are yellow/white (seem to be slightly engraved and filled with paint) and the focus ring has a very nice resistance and turns about 90° from the minimum focus distance of 0.17 m to infinity. I haven’t used this one. In terms of weight and size it sits inbetween the aforementioned AstrHori and this TTArtisan lens. Conveniently, the lens focuses sharpest on stars when it is turned all the way to the stop at infinity. Unlike most auto-focus lenses, it does not turn past infinity. So there’s no fussing with focusing at night.
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