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Daystar Quantum Front Wedge Plate - T-Thread
The Daystar Quantum Front Wedge Plate (Q3GWTF) provides the essential mechanical interface for using a Quantum-series filter in an off-axis configuration on a Schmidt-Cassegrain Telescope, featuring a secure female T-thread (M42x0.75mm) connection. This purpose-built plate is physically wedged to correct the optical alignment for an off-axis light path and accepts accessories like the GM2DT 2" drawtube snout for mounting.
Off-Axis SCT Adaptation with M42x0.75mm T-Threads
This is the Gold side plate for a Quantum on an SCT, where the energy rejection filter is applied off-axis. SCT owners must use the 1.9° wedge plate on the GOLD side of the filter, and use of the wrong plate will result in off-band transmission. Its female M42x0.75mm T-threads offer a universal and rigid connection point for your telescope-side adapters.
Accepts 2" Drawtube Snouts and SCT Thread Adapters
Designed for flexibility within the Daystar ecosystem, the Q3GWTF plate is compatible with key mounting accessories. It directly accepts the GM2DT 2" drawtube snout (discontinued, limited availability), allowing you to insert the entire filter assembly into a 2" focuser. It also pairs with the GF2SCTT SCT adapter for direct attachment to a telescope's rear cell, creating a solid, threaded imaging train.
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What is the purpose of the wedge in the Daystar Quantum Front Wedge Plate?
The wedge is a physical tilt built into the plate. It corrects the angle of the light path for a Daystar Quantum filter when it is used in an off-axis position on a Schmidt-Cassegrain Telescope (SCT). This ensures the filter's etalon performs correctly and maintains a uniform bandpass across the solar disk.
How do I connect the Q3GWTF Wedge Plate to my telescope?
The Q3GWTF plate itself has female M42x0.75mm T-threads. You connect it to your telescope using an appropriate adapter, such as:
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Daystar GM2DT: A 2" snout (discontinued, limited availability) that threads into the plate, allowing you to slide the filter into a 2" focuser.
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Daystar GF2SCTT: An adapter that threads into the plate and connects directly to the standard threads on the rear cell of an SCT.
Is the Daystar Quantum Front Wedge Plate compatible with filters other than the Quantum series?
No, this plate is specifically designed to be the front mounting plate for a Daystar Quantum series solar filter. It is not a standalone adapter and will not work with other filter types or brands.
What is the difference between this wedged plate and a standard flat plate for a Quantum filter?
A flat plate goes on the Gold side for on-axis refractor applications and this 1.9° wedge plate on the Gold side for off-axis SCT applications. Use of the wrong plate will result in off-band transmission.
I want to use my Daystar Quantum filter with an 8" SCT and an off-axis energy rejection filter. Is the Q3GWTF the right part?
Yes, this is the correct component for that exact scenario. The Daystar Quantum Front Wedge Plate is designed to mount your Quantum filter in an off-axis light path, such as the one created when using a sub-aperture energy rejection filter on the front of your 8" SCT.
Can I use the Daystar Quantum Front Wedge Plate with a small 80mm refractor mounted on my SCT for solar viewing?
No. Refractor owners must use a flat plate mounted on the gold side of the filter, and use of the wrong plate will result in off-band transmission. For a refractor, use the Q3GFTF Front Flat T Plate.
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| Part Number |
Q3GWTF |
| Kind |
Front (Gold side) wedge plate, off-axis SCT use (1.9° wedge) |
| Telescope-side connection |
M42x0.75 (T2) Female |
| Camera-side connection |
Daystar Quantum (Gold side) |
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Daystar Quantum Front Wedge Plate - T-Thread
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