How to Photograph Star Trails




Capturing star trails is easy and, for me, very exciting. The best, and safest way for you to get these images is to stack many 30 second exposures into a single frame, rather than using the bulb mode of your camera.

Shooting in blub mode can cause sensor damage, especially in the duration required to capture these photos. By taking many exposures, you are allowing the sensor a little "break" between the shots, and keeping things from getting too abused...

Things you will need...

1. Digital Camera (SLR)

Must be capable of taking timed exposures. My camera is a Nikon D3000, with the 18-55 zoom lens that came with it.

2. Tripod

Needed to hold the camera still. You'll want one with a fully articulating head, so that you can point it at the stars. You'll also want good functioning legs, so that you can level the shot(s).

3. Software

Point your browser to the following link:

It's 100% free and totally awesome, because that's how German photographer/programmers roll.

4. Rubber Band

5. A Post-It Note

Step 1: Make a Button Holder

You'll set your camera release mode for continuous shooting, so holding the button down will keep taking pictures. So, we will need a way to hold the button down for quite a while...

Enter the rubber band and the post-it note...

Fold your post it in thirds like so.

Then half again, like so.

Then half again, but this time, like this kind of so.

Now, get your roll on, and roll that little guy up.

And check for fit.

Now, rubber band that little fake finger in place.

Check and test your finger substitute with a faster shutter speed, so you don't have to wait 30 seconds before you know whether or not it's actually working. You should hear it clicking off photo after satisfying photo.

Step 2: Gather the Photos

Get your gear, and find a sweet spot for some shots.

You'll want to be away from pretty much all sources of light, including but not limited to street lights, highways, businesses, full moon, etc. You will have your camera aperature wide open, and be shooting at an elevated ISO, so limit the excess light. If the moon is indeed full, you can still do this, but try to set up in the "shade" of a tree that will block the moonlight. I also recommend a hill top, if you can find one. It's just better.

Set your camera and tripod up, and select a section of sky to shoot. The startrail photos you commonly see (like the title image) have large concentric arcs. Those were shot using Polaris (North Star) as the center of the photo, which won't show a trail.

You will need to make the following adjustments to you camera settings:

Mode: Manual
ISO: 400-800 (depends on how well your camera shoots at higher ISO's. I use 400)
Aperature: Full open
Exposure: 30 Seconds
Shutter Release: Continuous

EDIT: Went out tonight, and discovered another setting you might need to adjust. Turn off Noise Reduction if your camera has it. This feature processes each image before writing it to the card. This slows down the camera. Instead of shooting and shooting and shooting, it shoots, processes, shoots, processes, etc.,which is very frustrating. It took me half an hour in the dark before I got this sorted out. I forgot I enabled it. =/

And turn off the photo preview. It'll just drain the batteries faster.

Once you've got everything set and ready, get your finger imposter out, and rubber band him in place. You'll have to throw away your first few photos, as they'll probably be all shaky and whatnot.

So, you'll be taking 30 second exposures, in a sequence. Lets do some math.

30 seconds/exposure X 60 Mins per hour =120 Photos in one hour.

Make sure your card can hold around an hour or two worth of photos. I think I've got an 8 GB card, which will hold about 1,700 photos for me.

I recommend at least an hour of shooting to give a good trail.

EDIT: Also ran into another issue which has never appeared before: Dew. Tonight was very humid. Once the camera cooled down, dew began to settle on it, blurring about half my shots. If anyone has any ideas on how to work around this, let me know.

Step 3: Get Your Shots Ready

Pull all the shots off your camera, and get them ready for processing. Get that free awesome program up and ready, and load the photos. You'll also want to shoot a blackframe to stack in there with them. You get one by taking a picture with the lens cap on.

Step 4: Save Your Photo


You just got a sweet photo mosaic that captures the motion of the earth under the stars!

If you have any questions, just ask in the comments.



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    13 Discussions


    3 years ago

    Is there a lag where the camera stops taking photos to catch up with storing the info? and how have you avoided this ?



    4 years ago on Introduction

    Someone has the solution for d3000 bulb mode remote control (win)? diybit doesn't work in bulb i tried all remote control softwares -__- just with ml 3 and temp modify on the hardware we can?

    ty for this original solution! xD


    5 years ago on Step 3

    What is the blackframe for? (thanks)


    6 years ago on Step 2

    I have a D3000 as well and like to take star trails. The problem with the method you are using is that your camera will only let you take 100 shots in continuous without releasing and hitting the button again. If you download the program from you can control your camera from your computer. This is how I do it so i can take more pictures and get longer trails. But it does require setting up a space for your laptop next to your camera outside, and if your battery life sucks like mine does an ac extension cord for the computer also. Here is one of my star trails that i took I think it was about 200 pictures

    1 reply

    Reply 6 years ago on Introduction

    I've never encountered this, but I guess that's because I've not set up and shot for an hour. I'll give it a go and let you know what I come back with...


    how do you download the program??? When I go on the website there are no options to download.


    7 years ago on Introduction

    Sweet, there some good stars around here and my FZ100 has a 30sec exposure op. (unfortunately the 20sec photo option takes an exposure for 30sec and then processes it for 30 sec. think I can get way with 15?)

    1 reply

    Reply 7 years ago on Introduction

    You might be able to get away with 15s, but you'll have to elevate your ISO to compensate. If you spot some bright stars, go ahead and shoot at them, as opposed to a deep area of sky.

    With the brighter stars you might be able to get by with the 15s exposure.

    Come what may, post up the image. I'd love to see it!



    8 years ago on Step 2

    Is a very good way to solve the problem with the D3000. To solve the dew problem, you can use a hair dryer every 5 to 10 minutes.
    About the program, you can use StarTrail for PC
    and Helicon Focus for Mac

    1 reply

    Reply 7 years ago on Introduction

    Thanks for a link to the Mac program. I've not got a Mac, so I've never looked for one. The PC program you link to is the one I mention in my instructable. Very straightforward program.


    7 years ago on Step 2

    I have this camera, and Ive been meaning to do this kind of photography for a while, I have no tripod though.. any suggestions on what I could use to keep my camera upright (Safely) ?

    1 reply

    Reply 7 years ago on Introduction

    You will need a tripod, there is really no reliable way around it. You should be able to pick one up at a Walmart for less than or around $30. It will definitely come in handy.