What is this Shelyak adapter set for the Lhires III used for?
This adapter set is designed to physically connect a camera with a 17 mm backfocus to the Shelyak Lhires III spectrograph. Its primary purpose is to establish the precise, rigid spacing required for the camera's sensor to be at the spectrograph's focal plane.
Why is the 17 mm backfocus specification so important for the Lhires III?
Spectrographs like the Lhires III have a fixed optical design with a very specific focal plane. If the camera sensor is too close or too far away, the resulting spectrum will be out of focus, blurred, and unusable for scientific analysis. This adapter guarantees the correct 17 mm distance is maintained.
Can I use this adapter set for a camera with a different backfocus, like 13 mm, on my Lhires III?
No. This adapter set is machined specifically for cameras that have a native backfocus of 17 mm. Using it with a camera that has a different backfocus will result in an incorrect sensor position and poorly focused spectra. You must use the adapter set that matches your camera's backfocus.
Which cameras are compatible with this Lhires III adapter set?
Any astronomical camera that has a native backfocus of 17 mm is compatible with this adapter set. It is crucial to check your camera's technical specifications to confirm its backfocus distance before purchasing an adapter.
If I use this 17 mm adapter with my Lhires III on an 8" SCT to observe Vega (Alpha Lyrae), what is the goal?
The goal is to obtain a high-resolution spectrum of Vega, a type A0V star. This adapter ensures your camera is perfectly focused to capture the distinct hydrogen Balmer absorption lines (like H-alpha and H-beta) in Vega's atmosphere. Precise focus is critical for measuring the width and depth of these lines, which is a key part of stellar classification.
How do I install this adapter set on my Lhires III spectrograph?
Installation typically involves threading the components of the adapter set onto the camera port of the Lhires III and then attaching your camera to the other side. For detailed instructions, you should refer to the main user manual for the Shelyak Lhires III spectrograph, as the adapter is a component of that system.
