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Catseyecollimation Logo 75mm x 26mm - 1200 DPI clbr ISSUE53 PUBLISHED


APT stands for "AstroPhotography Tool" and it is like Swiss army knife for your astro imaging sessions. No matter what camera you use - Canon EOS DSLR or CCD, APT has the right tool for planning, collimating, aligning, focusing, framing, controlling, imaging, synchronizing, analyzing and monitoring. All its features are packed in an easy and comfortable to use interface with design that had no alternative back in 2009 when it was released. Since then APT is constantly being improved and refined by the real experience of many astro photographers from all over the world and by author's own experience. Currently APT works on MS Windows XP, 7, 8, 8.1 and 10.


Time unlimited "demo" version available in the Download page.


AptSite ISS_M45_2016

Support for:

  • Five generations of Canon EOS Models! Check the models matrix page for details.

  • ASCOM compatible CCD cameras - QHYCCD, Starlight Xpress, Atik, Orion, Moravian and more.

  • Native support for QSI cameras and filter wheels.

  • Native support for SBIG cameras and filter wheels.

  • TEMPer(Gold) and TEMPerHUM sensors. Never implemented in astro program before!

  • USB_Dewpoint sensor. Never implemented in astro program before!

  • Any serial control cable. See a list of serial cable vendors.

  • Shoestring Astronomy DSUSB/DSUSB2 and Biula Audio Trigger.

  • ASCOM compatible filter wheels.

  • ASCOM compatible focusers.

  • ASCOM filter wheel to focuser connection to apply filter focus offsets.

  • ASCOM compatible rotators.

  • ASCOM telescopes control.

  • Extended support for AstroHub and SirJolo arduino based focusers.

  • Direct dithering (APT Dithering), when there is no guiding program.

  • Direct pulse dithering (APT Pulse Dithering) for self-guided solutions.

  • Unihedron and compatible Sky Quality Meter devices.


User interface:


  • Dark adaptation friendly user interface.

  • Multiple color skins - Red,  Grey,  Light Grey,  Green,  Blue,  White (click on the colors to see screenshots).

  • Easy-to-use imaging plans editor.

  • Automatic preview after every exposure.

  • Preview in fit or 1:1 scale modes (changeable with simple double click).

  • Images browser with thumbnails and delete function.

  • Image magnifier that supports 3x, 5x, 10x and 15x magnifications.

  • Possibility to track the imaging plan execution progress. Remaining exposures, time and estimated end time.

  • Pause / Resume function when plan execution is in progress.

  • EOS EXIF Temperature readings - Show them after exposure in plan is taken.

  • Displaying the current temperature (requires TEMPer or TEMPerHUM) and current dew point (requires TEMPerHUM).

  • Histograms - R, G, B and L histograms of the taken image.

  • Histograms Stretching - per channel and automatic.

  • Graphs to show Temperature, EXIF, Humidity, DewPoint, CCD Temperature/Power, Guiding, Sky Quality changes during the night.

  • Camera shutter counter displaying on camera connection (Digic III and latter).

  • Monitoring of your laptop and camera battery energy level as well as the camera free space.

  • Notifications for low PC/Camera battery, low Camera space.

  • Small floating window when APT is minimized to show the current state.

  • Corrected image (right orientation) in Preview and LiveView by live flipping of the image horizontally and/or vertically as well as rotation, for easier object framing.

  • Sharpening and Negative image effects in Preview and LiveView.

  • Gamma and Brightness image effects in Preview and LiveView.

  • LV++ - LiveView image intensification in real time to show fainter objects.

  • LV Stack - Stacks the LiveView images in real time to help fainter objects framing.

  • Alignment aid - Rotatable/Movable cross.

  • Collimation aid.

  • Pixel Aid with various image statistics - Median, Std Dev and etc.

  • CCD Flats Aid to determine the right flats exposures and to create imaging plan.

  • Bahtinov Aid - powered by the Bahtinov Grabber technology to provide focusing with sub-pixel precision with a mask!

  • FWHM (Full Width Half Maximum) focusing method.

  • HFD (Half Flux Diameter) focusing method.

  • Automated focusing with ASCOM focusers using FWHM or HFD.

  • Darkness clock and Deep Sky Darkness (DSD) calculator.

  • Meridian Flip clock.

  • Sky Quality tracking with Unihedron device or by manually entered user estimations.

  • Objects Browser with 545 deep sky objects (Messier, Herschel 400, most of Caldwell and Hidden Treasures catalogs), 78 alignment stars, 2 start maps to use for size, coordinates selection and GoTo alignment. Available is audio extensions as additional download packages!

  • Possibility to enter/import/export data for custom objects in the Object Browser.

  • Field Of View calculator tuned for you camera and telescope.

  • Object framing aid.

  • Object Calculator that shows the actual object scale tuned for your camera and telescope as well as the size in pixels.

  • Sound notifications.

  • Multi-monitors support.

  • Tooltips help - Shows description per every feature (there are translations in English, Dutch, Polish, German, Portuguese, French, Italian, Bulgarian, Spanish, Chinese, Japanese, Czech and more are coming).

  • Sky Quality NELM (V) to/from MPSAS (B) convertor.

  • DARV - Drift Alignment by Robert Vice method - experimental. Never implemented in astro program before!

  • FITS file header viewer.

  • 28 keyboard shortcuts.

  • PointCraft for images plate solving.

  • Ability to frame object with simple click in a solved image ("Aim" mode in PointCraft).

  • GoTo operations confirmed with plate solving ("GoTo++" mode in PointCraft).

  • Temperature compensation of the focus position.

  • Focuser backlash measurement aid.

  • Check lists creation for easier setup, packing, imaging.