About
APT – AstroPhotography Tool is a feature-rich, Windows-based astrophotography software platform designed to manage and automate every aspect of an imaging session. First released in 2009, it has evolved into an industry-defining tool trusted by amateur and professional astrophotographers globally. APT supports eight generations of Canon EOS bodies, most Nikon DSLRs, and a wide range of ASCOM/INDIGO/INDI-compatible CCD and CMOS cameras from manufacturers like ZWO, QHYCCD, Atik, Starlight Xpress, and many more. Beyond cameras, it integrates with filter wheels, motorized focusers, telescopes, rotators, flat panels, dome controllers, and environmental sensors. Key functional modules include SessionCraft for sequencing, scheduling, automated meridian flips, cloud detection, and temperature-based refocusing; PointCraft for image plate solving, GoTo++ confirmed slewing, and one-click object framing; and DataCraft for automated image transfer, backup, and database indexing. Focusing is handled via FWHM, HFD, and InvPower (Fourier-based) methods, with a Bahtinov Aid feature delivering sub-pixel precision. Direct dithering is available even without a guiding program. APT is ideal for deep-sky imagers, planetary astrophotographers, and those running remote observatories. A time-unlimited demo version is freely available, with a paid license unlocking full functionality. It runs on Windows 7 through 11.
Key Features
- Broad Device Compatibility: Supports Canon EOS (8 generations), most Nikon DSLRs, and ASCOM/INDIGO/INDI-compatible cameras, focusers, filter wheels, telescopes, domes, rotators, and environmental sensors from dozens of manufacturers.
- SessionCraft Automation: Full session sequencing engine with scheduling, automated meridian flips, target re-centering, cloud detection, and temperature/time/filter-triggered refocusing.
- PointCraft Plate Solving: Automated image plate solving with GoTo++ confirmation mode for precise slewing, and an Aim mode to frame any object with a single click in a solved image.
- Advanced Focusing Methods: Supports FWHM, HFD, and InvPower (Fourier transform) focusing with Hyperbola Fit, plus a Bahtinov Aid for sub-pixel precision with a Bahtinov mask.
- DataCraft Image Management: Automated remote image transfer and backup, combined with database-driven image indexing and browsing for systematic data archiving.
Use Cases
- Automating multi-target deep-sky imaging sessions with Canon or Nikon DSLRs and an equatorial mount, including automated meridian flips and refocusing.
- Running a remote or semi-automated backyard observatory with ASCOM-compatible dome control, safety monitors, and environmental sensors all managed from one interface.
- Acquiring scientific-grade data with cooled CCD or CMOS cameras using precise filter sequences, temperature-compensated focus offsets, and automated dithering.
- Plate-solving and precisely centering astrophotography targets using PointCraft's GoTo++ mode to eliminate pointing errors before beginning a long sequence.
- Managing and archiving large volumes of astrophotography data using DataCraft's automated transfer, backup, and database indexing capabilities.
Pros
- Exceptional Device Support: Covers a broader range of cameras, mounts, focusers, and accessories than most competing astrophotography tools, reducing the need for multiple software packages.
- Professional-Grade Automation: Features like automated meridian flips, plate-solve-confirmed GoTo, and temperature-compensated focusing rival dedicated observatory control systems.
- Free Time-Unlimited Demo: A fully functional demo version is available indefinitely, allowing users to evaluate the software with no time pressure before purchasing.
- Mature & Battle-Tested: Continuously developed since 2009 with real-world feedback from a global community, making it highly reliable for serious imaging sessions.
Cons
- Windows Only: APT is exclusively available for Windows (7–11), leaving macOS and Linux astrophotographers without access to the platform.
- Steep Learning Curve: The sheer breadth of features and device integrations can be overwhelming for beginners just starting out in astrophotography.
- Dated UI Aesthetics: The interface reflects its long development history and may feel visually dated compared to newer astrophotography applications.
Frequently Asked Questions
What cameras does APT support?
APT supports eight generations of Canon EOS DSLRs, most Nikon DSLRs, and a wide array of CCD/CMOS cameras via ASCOM, INDIGO, and INDI protocols — including ZWO, QHYCCD, Atik, Starlight Xpress, Moravian, ToupTek, and many others. Native drivers are also included for ZWO, QHY, and SBIG cameras.
Is APT free to use?
APT offers a time-unlimited demo version that you can download and use without a purchase. A paid license is required to unlock the full feature set. This makes APT freemium — you can evaluate it indefinitely before buying.
Does APT work on macOS or Linux?
No, APT is a Windows-only application. It is compatible with Windows 7, 8, 8.1, 10, and 11, but there is no macOS or Linux version available.
What is SessionCraft in APT?
SessionCraft is APT's session automation engine. It handles imaging sequence control, scheduling, automated meridian flips, target re-centering via plate solving, cloud detection, and automatic refocusing triggered by temperature changes, filter swaps, elapsed time, or image count.
What focusing methods does APT support?
APT supports three automated focusing algorithms: FWHM (Full Width Half Maximum), HFD (Half Flux Diameter), and InvPower (based on Fourier transformation). It also features a Bahtinov Aid for sub-pixel manual focusing with a Bahtinov mask, and Hyperbola Fit for automated focuser runs — often considered more accurate than traditional V-curve methods.
