Moon shots with a tethered DSLR
One of the things that really frustrates me about photographing the moon is getting the camera settings right. OK, it’s not that big a deal but every time you touch a big zoom lens to make an adjustment there’s a degree of shake introduced, even with exposure delay set to on there’s still a chance the camera won’t have settled by the time you take a shot. It’s tempting when experimenting with exposures on a subject like the moon just to quickly change the shutter speed and hit the remote, especially if there’s cloud in the equation where exposure times can change from second to second. What you invariably get are shots that look ok on the preview but on closer inspection are slightly blurred. No good to anyone.
The solution I’ve found, where it’s convenient anyway, is to tether the camera to a laptop. Most modern DSLR’s should be capable of being controlled remotely from a laptop and there’s a range of freeware out there to help you along. For this example I’m using Sofortbild on a MacBook Pro tethered to my Nikon D7000.
Here’s a pic of the setup with a bonus can of beer in the background…
When connected to the laptop the camera show’s this on its top screen and all settings are now changeable directly from the app window on the Mac.
Sofortbild is a Nikon only Mac based app but there’s stacks of options out there for all models. Other than the laptop and software all I needed was a mini-USB to USB cable. I bought a 5m one from eBay for less than £2. This lets me have a certain freedom from the camera, i.e. I can sit in the car with the laptop or in my shed etc. Sounds like overkill but when the winter comes around and the temperatures drop I’ll be the one sat with a heater on taking pics from the garden shed!
In this example I’m setup on a photographic tripod but it would be fine with the camera connected to a telescope or piggybacked. The downside to the photographic tripod is no tracking so you do have to keep adjusting it to keep the moon in view.
With the setup done in Sofortbild there’s a live view option so I can see what the live view screen on the camera will see although, bigger on the laptop screen. You can zoom in on this too so you can really nail that focus. Much easier than peering at the 3″ screen on the back of the DSLR.
With optimum focus in place now you can take a shot. Within seconds the final image, not a preview, is viewable within the app, you can zoom in and carefully check exposure and focus with much more accuracy than you ever could on the camera preview screen. If you need to adjust all the settings are there in drop down menu’s easily accessible and more importantly, you are never touching the camera at all. Even at 400mm the moon takes a couple of minutes to travel through the FOV so you have a good few opportunities at settings before you’ll have to adjust the camera’s position.
With Sofortbild I can also set it to auto import into iPhoto where I catalogue all my RAW files. All shots are stored on your laptop not on the memory cards which for me is a win situation. At the end of the day all the shots will end up on the MacBook for processing anyway so it cuts out a step of my workflow process.
I’ve certainly found this a cheap and highly functional alternative to using a normal camera remote. It might not be suitable in all conditions but if you can use it it will provide benefits the traditional methods won’t. For the outlay of an extra long USB cable it’s transformed the way I’ll be taking astro pics in the future and it’s yet another part of the astro photography learning process ticked off!
Here are a few shots of the moon taking with this method.