Black and White

Long Exposure Photography with the iPhone

A few weeks ago, I discovered a really cool app for the iPhone that lets you do long-exposures during day-time without any filters - well, kind of...

Final Image

The app is called AvgCameraPro and is available for $0.99 in the iTunes App store.

Here is what you need and how it works:

  1. A tripod or some kind of stabilization for the iPhone is a must.
    I use the predecessor of the Joby GripTight GorillaPod for the iPhone and either place it on the ground or bend its arms around the ballhead of my Gitzo tripod.
  2. The app will take multiple pictures (1-128) and blends them together to create that long-exposure effect.
    I pretty much always choose 128 pictures and I wish it would let me shoot even more than that. The 128 picture setting will shoot a picture every ~1.5 seconds so the approximate "exposure time" is at around 3 minutes. In order to get really nice smooth clouds on a not too windy day, a 5-6 minutes exposure would work best.
  3. You can actually see the picture evolve as it blends the individual frames in real-time while shooting - this is really cool
  4. The drawback is that the app shoots the pictures with only 2 Megapixels so you end up with a 1224x1632 pixel image - this is not so cool... 

This is what you get straight out of camera:

Straight Out of Camera iPhone Picture

Long-exposure photography reduced to the max

Fake it if you can't make it

It's usually not my credo but there are certain situations which you cannot bend enough to reach your goal without the help of post-processing.

Final Version

I recently bought a HiTech big-stopper ND filter that blocks 10 stops of light. I originally opted for the Lee version but it seems to be impossible to get a hold of that filter if you don't want to wait for a couple of months - I'm not a very patient guy so I got the cheaper, lower quality HiTech versions for 10 and 6 stops. If you want to create long-exposures with very smooth looking clouds you need at least a 4-5 minute exposure time and on a sunny day, you will have to put 16-stops of ND filters in front of your lens.

That's exactly what I was planning to do the other day. I recently bought Joel Tjintjelaar's new Video Tutorial in which he explains in-depth how he creates his epic black and white long-exposures from shooting to post-processing.

Original RAW file

So, I was setting up my tripod and camera in front of a office-building complex in Zug, Switzerland and I had this great looking streak of clouds just atop that building perfectly aligned. It took me about 5 minutes to align the camera and just about when I pressed the shutter on my remote-release, a car drove by and wasn't able to pass - when I was setting up I didn't realize that cars would drive on that sidewalk but I was wrong. I thought about talking to the driver as I had 4 minutes left for my exposure to finish but when she started honking and waving I thought: "Screw it, let's let her pass!" 

Once she passed, I started again from scratch and a few minutes later I was ready again. BUT, the cloud was gone and all I was left with was deep blue sky. Great!

I decided to move on and find another location but due to the fact that all the clouds have vanished, I called it off.

Fortunately, I shot a few test-shots without the filters on to test the exposure and composition and decided to test a few things with those pictures when I remembered the "Motion Blur" tool in Photoshop.

I will not get into details on how I achieved the black and white final version - consult Joel's linked video tutorial mentioned above. 

Step 1 - Remove the Clutter

remove the leaves in the top corners using Content-Aware Fill.

I tried to avoid the leaves but my first priority was the perfect angle of the building and I knew I could easily get rid of them using Content-Aware Fill.

I've used the Polygonal Lasso Tool to select the areas around the leaves. I then clicked on 'Edit'->'Fill...' to get them removed. It worked perfectly here as expected.

Remove the leaves using Content-Aware Fill

Content-Aware Fill removed the leaves

Motion Blur Tool

Step 2 - Stretch the Clouds:

After I straightened the top of the building, I've used the Rectangular Marquee Tool to only select the sky. While the sky selected I've added a new layer by pressing 'Command'J'.

With the sky still selected (this is important), I chose 'Filter'->'Blur'->'Motion Blur...'. 

I then had to play around with the settings and they will vary based on the kind of clouds you have in your picture. For this particular sky, I selected an angle similar to the alignment of the streak of cloud and a very long distance of '1500' pixels to really stretch it out.

It is important to have your sky selection active as the Motion Blur tool would otherwise blur part of the sky into the building or the other way around and you don't want that.

What followed next was the conversion to black and white and all the other magic Joel teaches in his tutorial.

Branches are a photographer's best friend.

Actually, that's not true. You should even avoid branches when they stick from trees into the frame of your composition but in the water, they're your best friend, especially for long exposures like this 4 minute photograph.

I wasn't even forced to "cheat" here because the stick was at the exact right position - I didn't  touch it - I swear.

When composing this picture, it was important to me that the stick in the water wouldn't touch the dark reflection of the trees, had it done that, then I'd moved it. 

This is Lake Zug in Switzerland on a typical Summer day in July...

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Everything has changed - not

I haven't moved to a different blog platform, don't worry. I'm still with Squarespace because those guys are doing a tremendous job.

I just upgraded from Squarespace 5 to the new version 6, something I had in mind for quite some time.

The URL of the old blog-posts are still the same so I hope I didn't confuse Google to much with this.

I know I haven't been very active lately on my blog but I set new a new goal to post at least one new photography blog-post every week.

Those who follow me on Google+ will be familiar with my tips on photography but I noticed they're not that easy to find so I decided to continue posting those tips here on my blog and I will link to those posts from my Google+ site.

Feel free to chime in with any comments or questions.

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Zuger Kantonalbank Building in Zug - 4 minute exposure