Quick test: Noise on Nex-7 video

I tried to find out what the impact of the ISO on video on the Nex-7, so I cycled through with the lens cap on. The noise was not that visible so I tried to do what you usually try to avoid. I added brightness and sharpening.

Let me know, what you think. For me it prooves my experiences, that videos start get noisy with ISO bigger than 800.

Proof of concept: Compositing video in Motion 5

When the weather is not that good outside, what do you do? I decided to play around with a snippet of video and try out some compositing with video.

What did I try? I wanted a piece of text to move with something in the background and vanish behind a piece of foreground.

So what did I learn?

  • Next time I use only stabilized imagery – the handheld footage is good enough for the poc (proof of concept).
  • I have to work on the 3d-text effect, it still has its problems.
  • I have to work on the synchronisation of the movement of background and foreground.

But enough talk – here is the video. I’ll be outside….

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.

Image

Three wise monkeys

The three wise monkeys are a nice pictorial maxim. 見ざる, 聞かざる, 言わざる which literally means “don’t see, don’t hear, don’t speak”. It got a negative connotation in the western world.

I really like the old interpretation.

Look not at what is contrary to propriety; listen not to what is contrary to propriety; speak not what is contrary to propriety; make no movement which is contrary to propriety.

It does not have this negative touch, if you see propriety in the eye of the beholder.

Find a “Three Monkeys” wallpaper in Full-HD (1920×1080) here:

A very creative silversmith was working here...

Edit 1: There are pictograms of the three monkeys in unicode! See page 2 in the right column middle section.

It is not what you see…

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