Recently, let’s swing the other way around and check out the new tt art sans 17 millimeter, f, 1.4 it’s, a fully manual chinese lens, offering an aps c image circle, so it’ll be available on sony e mount canon, eos m, fuji, x and micro. Four thirds mounts the tested lens was on sony e mount here’s. What it looks like on a full frame camera so pretty clearly it’s intended for crop shooters there when it comes out it’s going to cost 140 us dollars or around 130 pounds in the uk. That is a very low price for such a very wide angle, lens the full frame equivalent of 25 millimeter with such a bright maximum matcher of f 1.4, which lets in lots of light and gets noticeably out of focus backgrounds. I find lenses like this pretty exciting. That combination of wide angle and bright aperture is pretty sweet, although the formula is hard to design and manufacture. Well, i would like to thank the per gear company for sending me a copy of this lens for testing, although, as usual, this is an independent review, i’ll be looking at both its strengths and its weaknesses. This lens is very small, with an unusual trapezoid shape and it sports a diagram of its internal optics on the outer lens barrel. That is a first for me, as i’ve mentioned already, it is a totally manual lens without any electronics it’s, based on a very shiny metal lens mount without any weather sealing most of the lenses body is taken up by the wide focus ring, which turns extremely smoothly.
Being nicely damped, the lens shows just a little focus breathing as you change focus zooming in a little as you focus more closely, the aperture control ring comes at the front and it has evenly spaced gentle clicks. Every half stop of aperture the front of the lens has a very small 40.5 millimeter filter thread and the lens did not come with a hood, its lens caps cruise in place, something i really hate, although you don’t have to screw it in much at all, and At least, that makes it a little more secure on there overall, its design certainly looked a little unusual, but in every other way, it’s a typically good quality metallic manual focused little chinese lens now on to image quality i’m testing it here on my little sony, a5100 With its 24 megapixel aps c sensor at f 1.4, we see some very impressive sharpness in the middle of your images, with quite a good contrast, but a little purple fringing is visible here. We also see a cool color cast in this lenses. Image, uh cool, as in blue at all different apertures. The corners, however, look absolutely terrible at f 1.4, as you can see here, stop down to f2 and there’s only a tiny improvement and contrast in those corners, but the middle of the image now looks absolutely perfect. At f 2.8, the middle is just as good the corner image. Quality is beginning to pick up a bit now at f4, the corners look fairly good, although right in the edges, we’re still catching some strong color, fringing, f5.
6 and f8. Both look excellent in the corners. Now, if you stop down as far as f 16, then some softness begins to emerge due to the effects of diffraction overall well, considering the lens is very low price. Its performance is actually quite adequate. It is always very sharp in the middle of your images with decent contrast. The corners need to be stopped down quite a lot for good performance, but they do get very sharp if you do so. The lens is clearly a good enough performer. If you’re careful to use it within its limitations, all right let’s look at distortion and vignetting. Now the lens projects a little bowel distortion noticeable, but not bad vignetting is there at f 1.4, but it’s, not disastrous at f2 and f 2.8. Those corners brighten up pretty quickly, so the lens is actually corrected reasonably well. Here now, let’s take a look at close up image quality. The lens can focus down to 20 centimeters, which is pretty useful for shooting smaller subjects at f 1.4. Close up image quality is sharp, but contrast is slightly low, stop down to f2 or f 2.8 for contrast to catch up with sharpness here. How well does this lens work against bright lights? There are quite some problems here actually with some pretty complex flaring patterns, even when those bright lights are just on the edge of your images, while we’re working in a dark now let’s look at coma levels at f, 1.
4 coma smearing is very strong on bright points Of light in the corners of your images stop down to f2 to see it reduced, although even at f, 2.8 and f4, we still see some bright chromatic aberration there. So if you were dreaming of using this lens for serious astrophotography and not just for fun, that’s a bit of a bucket of cold water for you, if you stop down as far as f8, then you are treated to some pretty strong sun stars, let’s zoom out A little and take a look at them, they’re, pretty impressive there. Finally bokke the quality of this lenses. Booker is just good it’s, not super soft, but neither is it busy and sometimes it can look really quite pleasant overall. If this lens had been more expensive, i would have had to class it as a bit of a failure, as it does have quite a few issues. Its colors are very cool and its flaring is pretty strong and you need to stop it down for sharp image corners. However, if you don’t desperately need sharp corners in your images at bright, apertures, then actually it’s, fairly capable of getting good pictures and it’s low vignetting and distortion and reasonably nice bokeh mean that considering it’s very low price, it is a nice budget option it’s quite interesting.