Cars and stars: How to shoot the night sky, Part 2

For part 1, click here.

Happy Turkey week!

Last week, we went over how to shoot the night sky and apply it to automotive photography. Now, I’ll show you how to apply your star images in the final composite.

Light Painting

After we’ve taken our image of the night sky, make sure to refocus the camera on the car itself. Focusing the camera to infinity, as you do when shooting stars, causes your foreground to be blurry, which will result in an unusable image. To help the camera out, point a light at the car, then move your focus point to that spot and refocus. Be careful not to move your camera at all while doing this.

To learn how to edit a light painting shoot, see this post.

BMW M4 light painting
Holding a light on the car will help the camera refocus on the point you want.

Moving to post

Remember the star image I had you take beforehand for practice? We’ll use that now. After you’ve completed adding all your layers together from your light painting, you’ll have something like the following.

BMW M4 no stars
Not nearly enough stars to make it a WOW image.

We can see some stars, but clearly the light pollution and our equipment have made the sky simply average. Import your flattened star image from that little practice session, then set the blend mode to either “screen”, or “lighter color”. My original image had lots of purple haze in it, so lighter color was the better option for me here. Then, add a layer mask, and paint away the parts where you don’t want any star to show through.

BMW M4 animation
You can see the effect our star image has, even in a low res GIF.

The M760i image

We’ll use another example from the same shoot of an M760i, where we’re emphasizing the sky more by shooting the car on a hill and looking up for a clear horizon line. This time, because of the different angle, light pollution was even worse than in the M4 image…

BMW M760i at night
Light pollution meant almost no stars were visible.

Remember that because of the rotation of the Earth, holding the shutter open longer than about 10 seconds causes the stars to blur, which is already happening a bit here. So, using the same retouching technique, let’s bring in our original star image.

BMW M760i stars
Our original image still lacks some WOW factor.

That’s better, but still lacking something. So, maybe bringing in some of the Milky Way Galaxy would help, and we can use free stock images for this. Bring your image in, set the blend most to “lighter color”, and then reduce the opacity to 30%. When painting in your mask, make sure to leave some room around the horizon, since the brighter sky would occlude some of the stars from view. I also had to rotate my galaxy image a bit to position it in a way that lead your eye to the car.

BMW M760i stars
The final image, with galaxy in place.

Overall, the key to basic astrophotography is the same as any other special effect when shooting a car – keep your car as the main focus, and let the effects compliment the image.

Happy Thanksgiving!

Feel free to email me at mike@machineswithsouls.com with any questions.

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