It's been a good three years now since I swapped my HP laptop for a Macbook Pro. In the mean time, I've started doing a bit more astrophotography and of course the change of operating system has affected the tools I use to obtain and process photos.
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Amateur astronomers have traditionally mostly used Windows, so there are a lot of Windows tools, both freeware and payware, to help. I used to run the freeware ones in Wine on Ubuntu with varying levels of success.
When I first got the Mac, I had a lot of trouble getting Wine to run reliably and eventually ended up doing my alignment and processing manually in The Gimp. However, that's time consuming and rather fiddly and limited to stacking static exposures.
However, I've recently started finding quite a bit of Mac OS based astrophotography software. I don't know if that means it's all fairly new or whether my Google skills failed me over the past years :-)
Software
I thought I'd document what I use, in the hope that I can save others who want to use their Macs some searching.
Some are Windows software, but run OK on Mac OS X. You can turn them into normal double click applications using a utility called WineSkin Winery.
Obtaining data from video camera:
- oaCapture (MacOS X, free)
- AstroImager (Mac OS X, payware, free trial)
Format-converting video data:
- Handbrake (Mac OS X, free, open source)
Processing video data:
- AutoStakkert! (Windows + Wine, free for non-commercial use, donationware)
Obtaining data from DSLR:
- AstroDSLR (Mac OS X, payware, free trial)
Processing and stacking DSLR files and post-processing video stacks:
- RegiStax (Windows + Wine, free)
- Nebulosity (Mac OS X, payware, free trial)
Post-processing:
- The Gimp (Max OS X, free, open source)
Telescope guiding:
- AstroGuider (Mac OS X, payware, free trial)
- PHD2 (Mac OS X, free, open source)
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Hardware
A few weeks ago I bought a ZWO ASI120MC-S astro camera, as that was on sale and listed by Nebulosity as supported by OSX. Until then I'd messed around with a hacked up Logitech webcam, which seemed to only be supported by the Photo Booth app.
I've not done any guiding yet (I need a way to mount the guide scope on the main scope - d'oh) but the camera works well with Nebulosity 4 and oaCapture. I'm looking forward to being able to grab Jupiter with it in a month or so and Saturn and Mars later this year.
The image to the right is a stack of 24x5 second unguided exposures of the trapezium in M42. Not too bad for a quick test on a half-moon night.
Settings
I've been fiddling with Nebulosity abit, to try and get it to stack the RAW images from my Nikon D750 as colour. I found a conversion matrix that was supposed to be decent, but as it turns out that made all images far too blue.
The current matrix I use is listed below. If you find a better one, please let me know.
| R | G | B | |
|---|---|---|---|
| R | 0.50 | 0.00 | 1.00 |
| G | 0.00 | 1.00 | 0.00 |
| B | 1.00 | 0.00 | 0.50 |
Photo Booth User Guide
You can take a single photo or a group of four photos, or record a video using your computer’s built-in camera or an external video camera connected to your Mac.
Take a photo
If you’re using an external video camera, make sure it’s connected to your computer and turned on.
In the Photo Booth app on your Mac, if you see the View Photo Preview button or the View Video Preview button , click it to see the Take Photo button or the Record Video button .
Use the buttons in the bottom left to choose whether to take a sequence of four photos (called a 4-up photo) or a single photo.
Click the Take Photo button .
Record a video
If you’re using an external video camera, make sure it’s connected to your computer and turned on.
In the Photo Booth app on your Mac, if you see the View Photo Preview button or the View Video Preview button , click it to see the Take Photo button or the Record Video button .
Click the Video button in the bottom left.
Click the Record Video button . Click the Stop button when you finish recording.
Turn off the countdown or flash for photos
When you take a photo, there’s a three-second countdown before the photo is taken. Your screen flashes when the photo is taken.
In the Photo Booth app on your Mac, do any of the following:
Turn off the countdown: Hold down the Option key while clicking the Take Photo button .
Turn off the flash: Hold down the Shift key while clicking the Take Photo button .
Change the flash setting: Choose Camera > Enable Screen Flash.
Turn off both the countdown and the flash: Press and hold the Option and Shift keys while you click the Take Photo button .
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Choose a screen size
When taking photos or recording a video in PhotoBooth, you can adjust the window size to either full screen to use your entire computer screen, or Split View if you want to work in another app at the same time.
In the Photo Booth app on your Mac, do one of the following:
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Use Photo Booth in full screen: Move the pointer to the green button in the top-left corner of the Photo Booth window, then choose Enter Full Screen from the menu that appears, or click the button . To leave the full-screen view, move the pointer to the green button again, then choose Exit Full Screen from the menu that appears, or click the button .
Use Photo Booth in Split View: Move the pointer to the green button in the top-left corner of the Photo Booth window, then choose Tile Window to Left of Screen or Tile Window to Right of Screen from the menu that appears. To leave the Split View, click its window.
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