Joined in 2023 
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very simply do first all your exposure/color correction and then Export to Fisheye-Hemi plugin using the “full frame” option As you can see from the below the TTArtisan 11mm is covering less than the Samyang 12mm, so it is more a 13mm than a 11mm There is a small built-in lens hood, but a lens of this type cannot accommodate screw-on filters or filter holders. With some care, I found it was possible to hand-hold a 100mm square StarGlow filter in front of the lens to add a soft focus effect to stars.
I haven’t used this one. In terms of weight and size it sits inbetween the aforementioned TTArtisan and this AstrHori. Just like the TTArtisan 11mm 2.8 this AstrHori 12mm 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 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. When using a clip-in light pollution filter (an Astronomik CLS) in my Canon Ra camera, the lens now had to be set to about 1 meter to focus on stars, due to the focus shift introduced by placing the filter in front of the sensor. (Filters in front of lenses produce no focus shift.)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. Later on in the evening, the TTArtisan 11mm f/2.8 fisheye lens was great for capturing the atmosphere of the event too. I’m not sure I would use a lens like this to photograph an event professionally, but I could definitely see me using this lens for this sort of thing again. It was undeniably fun, and despite the whakyness, I can’t help but really like the result – and taking them was a lot of fun too, especially after a drink… 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. No focusing tab, but the lens has a small metal notch on the focusing ring for easy focusing – very useful Whatever the limits of my abilities, the fun-factor of using a fisheye is unlimited. This bad boy covers 180º, with a bright 2,8 maximum aperture. Talk about fun. I’m sure loads of you out there know what it’s like to shoot fisheye lenses. Move a little and the entire frame changes. Sag a shoulder slightly and the horizon bolts down. Because it covers 180º and does the bulbous fisheye thing, you have to remember a few things:
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. So far I’ve taken the TTArtisan 11mm f/2.8 fisheye out in anger twice. The first time was for a bit of test around the edge of some woods and near where I work in Worcester. I didn’t really have any set ideas about what I wanted to do with the lens as I set out, short of just getting to grips again with the nature of such an unusual lens.I haven’t used this one. In terms of weight and size it sits inbetween the aforementioned AstrHori and this TTArtisan lens. Already in the sharpness section we saw solid but not outstanding corner sharpness and most of the time the performance there is closely related to the coma correction. Generally the correction is decent at f/2.8 and I think slightly better than the TTArtisan’s. Even stopped down to f/5.6 the corners don’t look perfectly clean though.
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