About
PEMPro, developed by CCDWare, is a professional-grade astronomy software tool focused on optimizing the performance of telescope mounts through Periodic Error Correction (PEC). Periodic error is a recurring mechanical imperfection in telescope mount gears that causes stars to drift during long-exposure astrophotography — PEMPro addresses this by precisely measuring, analyzing, and correcting that error. The software guides users through recording the periodic error waveform of their mount's worm gear, then generates a correction curve that can be uploaded directly to compatible mounts or used to drive real-time corrections. This results in significantly improved tracking accuracy, reducing star trailing and enabling longer unguided or guided exposures. PEMPro also assists with polar alignment verification and drift analysis, making it a comprehensive utility for mount tuning. It is compatible with a wide range of popular amateur and semi-professional telescope mounts via standard control protocols. Designed for both amateur enthusiasts and professional imagers, PEMPro provides a structured, data-driven approach to mount calibration that was previously only achievable through expensive factory servicing. CCDWare backs the product with dedicated technical support, documentation, and a community of experienced users. The software runs on Windows and integrates seamlessly into existing astrophotography workflows.
Key Features
- Periodic Error Analysis: Precisely records and visualizes the periodic error waveform of your telescope mount's worm gear over a full worm period.
- PEC Curve Generation: Automatically generates a Periodic Error Correction (PEC) curve that can be uploaded to compatible mounts to minimize tracking error.
- Polar Alignment Assistance: Provides tools to verify and refine polar alignment, a critical prerequisite for accurate long-exposure astrophotography.
- Mount Performance Optimization: Delivers a data-driven workflow to improve tracking accuracy, enabling longer unguided exposures and higher-quality images.
- Broad Mount Compatibility: Works with a wide range of popular amateur and semi-professional telescope mounts through standard control protocols.
Use Cases
- Calibrating a new telescope mount before an astrophotography imaging session to maximize tracking accuracy.
- Diagnosing and correcting persistent star trailing or elongation caused by periodic error in the mount's worm gear.
- Improving unguided exposure length by uploading a refined PEC correction curve directly to a compatible mount.
- Verifying and fine-tuning polar alignment to ensure stable, accurate tracking during long-duration deep-sky imaging.
- Benchmarking and comparing mount performance before and after maintenance or mechanical adjustments.
Pros
- Significant Tracking Improvement: Measurably reduces periodic error, leading to sharper stars and longer usable exposures in astrophotography sessions.
- Data-Driven Approach: Provides quantitative analysis of mount performance rather than guesswork, giving users confidence in their calibration results.
- Dedicated Expert Support: CCDWare offers strong customer support, detailed documentation, and an engaged community of experienced astronomy users.
Cons
- Windows Only: PEMPro is a Windows desktop application, limiting access for users on macOS or Linux systems.
- Steep Learning Curve: The software requires familiarity with telescope mount mechanics and astrophotography workflows, which may challenge beginners.
- Paid License Required: PEMPro is commercial software with no free tier, which may be a barrier for casual or budget-conscious hobbyists.
Frequently Asked Questions
What is periodic error and why does it matter for astrophotography?
Periodic error is a repeating mechanical imperfection in a mount's worm gear that causes the telescope to drift in right ascension at regular intervals. This drift causes star trailing in long-exposure images, reducing sharpness and detail.
Which telescope mounts are compatible with PEMPro?
PEMPro is compatible with a wide variety of popular amateur and semi-professional telescope mounts that support standard control protocols such as ASCOM. Consult CCDWare's documentation for a full compatibility list.
Do I need a guide camera to use PEMPro?
Yes, PEMPro typically uses a guide camera and star to record the mount's periodic error waveform. The camera feeds positional data into the software for analysis and correction curve generation.
How long does the PEMPro calibration process take?
The process involves recording at least one full worm period of your mount, which can range from about 4 to 10 minutes depending on the mount. Multiple recordings improve accuracy.
Is PEMPro still actively supported?
Yes, PEMPro is actively supported by CCDWare. Note that their other product, FocusMax, has been retired after 25+ years, but PEMPro remains a current, supported product.
