Tag Archives: Sigma

Review of Sigma 30mm f/2.8 EX DN Sharpness

So I made some further observations after the first review yesterday. I also got a message telling me that other and more detailed shots are needed to see. So here we go. Below you will find the corner and center crops from shots I took today in the morning. The shots were made handheld and the ISO was limited to 100. First the center shots of a street scene using apertures 2.8, 4 and 8 As you can see, the center gets sharper at f/4 to soften up at f/8. Next you will see the details in the upper right corner. As you can notice there is a slight purple fringing which gets softer when the lens is stepped down. Strangely enough the shot at f/4 is not sharp. I think the branch has moved in the wind, but the wall looks sharper.You can find the full SOOC shots here. As a conclusion I have to say, that for me the lens is very fine wide open. I haven’t considered if I prefer f/8 or f/16 for my night cityscapes. What still is strange to me is that the lens falls in to a resting position when turned off with a hearable soft *tock*. What I have not tested by now is the fact, that the lens seems to take long to “boot” – the Iris is closed and opens wide only to get stepped into positions. I will save this for the next blog entry. If you have questions you can also leave a comment. @Edit20120420: A reader mentioned that he thinks the blurriness at f/4 in the corner could be due to the exhaust of the truck you see. This sounds reasonable as everything is a little bit blurry in that corner.

Quick review of the Sigma 30mm 1:2.8 EX DN for Sony Nex E-Mount

When I first took it out of the packaging I thought it was broken. But the lens element is not fixed if the lens is not “on”, aperture is closed.

Size is smaller than the 18-55 kit lens, I would say it is as if someone cut the kit lens between zoom and focus ring. Build quality is high and solid plastics. It feels good and I like the smooth focus ring. I tried some shots, could not find any odd things. I doscovered some very soft magenta streaks in very high dynamic regions when pixelpeeping. Concerning the quality I would say that this is a no-brainer for Euro 199,-.

For those of you who like pixelpeeping I have some testshots in f/2.8, f/4 and f/8 at my ge.tt acount, for all the others: A wallpaper in Full-HD.


Panoramic HDR Experiment

I went out with my tripod to shoot a structured panorama in at least 3 by 2. I made it 4 by 2 but it was not convincing. Because I also experimented…

Another thing I wanted to try was a panorama with a wide angle lens. So I used my trusted Sigma portrait in 10mm and used a recipe which nearly always worked for me.

The recipe as always: 3 pictures using 9 brackets with Magic Lantern on my 60D, HDR created with HDR Efex, and panorama with Microsoft ICE.

There were problems with the distortion near the lens, like in the railing you can see on the left. I don’t know if the result is also there because of the horizontal lines. I will try to find out.

I am very pleased with the look of this picture. What is your opinion?