What is the Baader UFC Protection Dark-Slider?
It is a 3D-printed dark slide for the Baader Universal Filter Changer (UFC). When inserted, it closes the aperture of the UFC and the telescope at the same time and vignettes the optical path 100%, for taking dark frames with CMOS cameras. Baader also offers the STL files as a free download.
How do I use the printed UFC Dark-Slider to take dark frames?
Insert the Dark-Slider into your Baader UFC base just as you would a filter slide. With the Dark-Slider inserted, which closes the aperture of the UFC and the telescope at the same time, you can then take exposures with your camera that match the duration and temperature of your light frames. The slider ensures no stray light reaches the sensor, resulting in pure dark frames.
What material should I use to 3D print the UFC Dark-Slider?
For best results, use a filament that is opaque and matte to prevent internal reflections. Black PETG or ABS are excellent choices due to their durability and light-blocking properties. High-quality black PLA can also work, but verify that it is fully opaque when printed.
Where can I download the STL files for the UFC Dark-Slider?
The STL files are available for free on this product page under the "Downloads" tab. You must be logged into a customer account to access the download link.
Can I sell the 3D prints I make from the UFC Dark-Slider files?
No. The files are licensed under a Creative Commons Non-Commercial (NC) license (CC BY-NC-SA 4.0). You are free to print them for personal use, but you may not sell the printed objects or the files themselves.
Why do I need a dark slider for my Baader UFC system?
A dedicated dark slider provides a guaranteed light-tight seal directly in the optical path. This is often more reliable and convenient than capping the telescope, especially for remote or automated imaging setups where you want to capture calibration frames without physically touching the equipment.
