Work in progress!
¶ Introduction
The OpenAstroExplorer shares many of the same usage principles as the OpenAstroTracker, so users familiar with OAT will recognize a lot of the workflow. For general astrophotography knowledge that goes beyond this device, readers can consult the broader Astrophotography and Astrophoto Setup resources. This guide is intended to serve a wide audience – from DIY builders and astrophotography beginners to more advanced users – and aims to provide a clear foundation for everyone.
¶ Quick Start: Your First Night with OAE
For a very brief field manual, please see the dedicated Quick Start Guide. That quick overview assumes that you have already read and understood the broader instructions in this Usage Guide, and is meant as a condensed reference for use in the field.
¶ Before You Start
¶ Choosing a lens and camera
Most DSLRs made in the last 15 years will work fine with OAE. Using your existing gear is the best way to start. Even kit lenses are sufficient for beginners, although a very poor lens can limit results more than an older camera. For those looking to upgrade, many used vintage lenses are excellent, affordable options.
If you want to delve into proper telescopes, detailed information about those would take too much space here. As the OAE functions no differently than other commercial telescope mounts, much of the knowledge and resources available online for astrophotography telescopes will apply here as well. A general rule of thumb: bigger is not always better. Larger telescopes can be heavy, harder to balance, and more demanding on tracking accuracy. Smaller, lighter telescopes often provide a more forgiving and enjoyable starting point, especially when paired with OAE.
¶ Laptop requirements
The OAE requires a computer connection to operate. While OAT can be partially standalone, OAE can not. A Windows laptop is recommended for best compatibility. Linux and macOS can also be used, but with extremely limited support, and some features (such as AutoPA) do not work. The PC handles control software, guiding, and data capture, making it an essential part of the setup.
¶ Why use Autoguiding?
Autoguiding uses a small, dedicated guide scope and camera to monitor a single star during long exposures. If the star drifts, the PC sends corrections to the mount’s motors, dramatically improving tracking accuracy. This allows for longer exposures and higher focal lengths without star trailing. For more details and setup instructions, see the OpenAstroGuider and Guiding pages.
¶ Initial Calibration
(Performed before first use, not required every session)
In order to do these calibrations, you should have the Firmware flashed and set up a connection with a PC with OATControl open and connected.
¶ Home Positions
The following postions are referred to as the home positions for each axis. At the beginning of a session, the mount should be moved into these positions.
¶ RA
¶ DEC
¶ ALT
¶ AZ
The AZ axis is the only axis that does not have a precise indicator. It doesn't have to be moved to a precise point, just having the ground palte somewhat straight is enough.
¶ RA & DEC Axes
If these terms are unclear to you, check the corresponding section in Astrophotography.
-
Verifying correct steps/degree:
In OATControl, slew the mount exactly 6 hours in RA. This should result in a 90° rotation of the RA axis. If not, double check your step configuration in the firmware. -
Verifying direction:
Home the mount, and set the home position again.
(Increase RA, CCW rotation)
(Decrease DEC, CW rotation)
¶ ALT & AZ Adjustments
- steps
- direction
¶ Verifying Motion
- test procedure by connecting to Stellarium and pointing to sun or similar
¶ Setting Up the OpenAstroExplorer
¶ Tripod setup
[Tripod adapter on EQ5]
¶ Mount unfolding and mechanical preparation
The ALT axis of OAE can be set to 4 distinct positions, each corresponding to a latitude range. The motorized motion of the axis then fine adjusts within the 10° of range.
When attaching, the M5 bolts that come out of the ALT axis slide into the slot. Insert them fully into the slot. Then tighten the ALT Knobs with a light tug.
¶ RA Ring & Belt tension
[RA Ring magnetics, belt attachment and tension]
¶ Attaching and balancing counterweights
[CW bar]
[CWs]
¶ Attaching imaging gear
[image telescope]
[image camera + Guider]
¶ Cabling & PC connection (link to Software/OATControl pages)
¶ Session Operation
¶ Connecting to PC and software
¶ AutoPA (Automated Polar Alignment)
¶ Running guiding (link to Guiding page)
¶ Monitoring performance and making adjustments
¶ After the Session
- Safe shutdown procedure
- Disassembly and storage
- Protecting sensitive parts (electronics, 3D-printed parts)
¶ Troubleshooting & Common Issues
- Alignment errors (stars trailing)
- Belt tension problems
- Connection/software issues
- Mechanical stiffness or imbalance
¶ Additional Resources
- Links to detailed pages (Software, OATControl, Guiding)
- Community forums and Wiki contributions