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Shelyak High Performance 23µm Slit
The Shelyak High Performance 23µm Slit replaces standard spectroscope slits with a protected aluminum coating that achieves over 90% reflectivity, a significant increase over the ~50% rate of typical chrome slits. Its anti-reflection treatment is extended to cover the 350-800nm spectral range, making it a critical upgrade for Shelyak ALPY 600 and UVEX spectroscopes.
Protected Aluminum Coating: Over 90% Reflectivity
By using a protected aluminum coating, this 23µm slit achieves a reflection rate of over 90%. This nearly doubles the light reflected to your guide camera compared to standard chrome slits, which typically reflect only around 50% of the light, leading to more stable and accurate guiding.
This slit also features a larger reflective surface, which is particularly beneficial when using guide cameras with larger sensors, such as the IMX174, with an Alpy guiding module, ensuring full illumination of the sensor.
350-800nm AR Coating for UVEX & ALPY 600
The anti-reflection treatment has been optimized for a broad 350-800nm spectral range. This enhancement is especially critical for the UVEX spectroscope, allowing you to maintain high signal-to-noise across its entire operational range, from the near-ultraviolet to the near-infrared.
This slit is a direct-fit upgrade for both the Shelyak ALPY 600 and UVEX spectroscopes. It is the recommended slit for any UVEX user seeking to maximize instrument throughput and scientific output.
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What is the main advantage of the Shelyak High Performance 23µm Slit over a standard one?
The primary benefit is its reflectivity of over 90% from its protected aluminum coating, compared to ~50% for standard chrome slits. This sends significantly more light to your guide camera, improving guiding accuracy on fainter stars.
I use a Shelyak UVEX spectroscope to study Be stars. Is this 23µm slit a good choice?
Yes, it is highly recommended for the UVEX. Its extended anti-reflection coating (350-800nm) ensures maximum light throughput across the UVEX's wide spectral range, which is ideal for capturing both the Balmer lines in the visible and other features toward the UV and NIR ends of the spectrum.
Will the High Performance 23µm Slit work with my ALPY 600 and an IMX174 guide camera?
Absolutely. The slit is fully compatible with the ALPY 600. It also features a larger reflective surface specifically to better accommodate larger sensors like the IMX174, ensuring the guide star is not vignetted.
What material is the coating on the High Performance 23µm Slit?
The slit features a protected aluminum coating. This material provides the high reflectivity (>90%) and durability required for spectrographic applications.
Is the 23µm High Performance Slit compatible with other spectroscopes?
This slit is specifically designed and confirmed to be compatible with the Shelyak ALPY 600 and Shelyak UVEX spectroscopes. Compatibility with other models is not guaranteed.
Why is the anti-reflection coating on the High Performance 23µm Slit important?
The anti-reflection coating minimizes light loss as it passes through the slit into the spectroscope. By extending this coating to cover 350-800nm, the slit ensures that more photons from your target reach the science camera, improving the signal-to-noise ratio of your final spectrum.
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| Slit Width |
23µm |
| Coating |
Protected Aluminum |
| Reflectivity |
> 90% |
| Anti-Reflection Range |
350-800nm |
| Compatibility |
Shelyak ALPY 600, Shelyak UVEX |
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High Performance Slit 23µm
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Shelyak 1-Year Warranty
