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Starizona RASA 8 Filter Holder - M42 Threads
The Starizona RASA 8 Filter Holder provides a simple, rigid solution for using 2" mounted filters on the Celestron RASA 8 astrograph. This adapter is specifically engineered for cameras that use M42 threads and require precisely 17.5mm of backfocus. It replaces the RASA 8's original camera adapter flange, creating a dedicated filter slot for cameras that are not compatible with a Filter Slider.
Add a 2" Filter Slot to Your Celestron RASA 8
The Starizona Filter Holder puts a single 2" mounted filter in the optical train in place of the optical window that comes installed in the RASA 8. This design is ideal for imagers using dedicated cameras without built-in filter holders, allowing the use of light pollution, narrowband, or color filters without complex accessories.
Precision Fit for M42 Cameras with 17.5mm Backfocus
It replaces the RASA 8's standard camera adapter flange, is held in place by the stock lock ring, and has M42 threads for cameras with 17.5mm of backfocus. Starizona also included slots in the holder's body, ensuring you can still access the RASA's collimation screws without removing your imaging setup.
Starizona RASA 8 Filter Holder: Choosing M42 vs. M54 Threads
Starizona produces this filter holder in two versions, differing only by the camera-side connection thread. This model provides M42 threads, commonly found on many dedicated astronomy cameras. If your camera uses larger M54 threads, you will need the M54 version of the holder to connect properly. Both hold a 2" mounted filter for cameras with 17.5mm of backfocus.
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What is the purpose of the Starizona RASA 8 Filter Holder?
This holder allows you to install a single 2" mounted filter into the optical path of a Celestron RASA 8 telescope. It's designed for cameras that do not have their own filter wheel or drawer and need a simple, rigid way to use a filter while maintaining the correct backfocus.
Which cameras work with this M42 Starizona RASA 8 Filter Holder?
Cameras that connect with M42 threads and have a backfocus (sensor-to-flange distance) of 17.5mm. Check your camera's specifications for both.
Do I remove the optical window from my RASA 8 to use this filter holder?
Yes. The Starizona RASA 8 Filter Holder is designed to replace both the stock camera adapter and the removable optical window. The 2" filter you install in the holder takes the place of the optical window in the light path.
Can I still collimate my RASA 8 with the filter holder installed?
Yes. The holder features cut-out slots that provide direct access to the RASA's collimation screws. You can still reach the collimation screws with the holder installed.
How do I choose between the M42 and M54 versions of the Starizona RASA 8 Filter Holder?
The choice depends entirely on the threads on your camera. This version is for cameras with M42 threads. If your camera has larger M54 threads, you should select the M54 version of the holder. Both maintain the same 17.5mm backfocus and hold a 2" filter.
Will this Starizona RASA 8 holder work with a filter wheel or filter drawer?
It is meant for cameras that are not compatible with a Filter Slider and holds a single 2" mounted filter for cameras with 17.5mm of backfocus.
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| Compatible Telescope |
Celestron RASA 8 |
| Camera Thread |
M42 |
| Camera Backfocus |
17.5 mm |
| Filter Size |
2" mounted |
| Mounting |
replaces the RASA 8 camera adapter flange, held by the stock lock ring |
| Collimation Access |
slots keep the RASA collimation screws accessible |
| Telescope-Side Connection |
Celestron RASA 8 camera adapter flange position, held by the stock lock ring |
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RASA 8 Filter Holder, M42 threads
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Starizona Warranty
