What is the primary purpose of the Starlight Instruments 3.5" End Cap?
This end cap is designed to provide a secure, threaded connection between a 3.5" Feather Touch focuser and a Stellarvue 85mm Field Flattener. It replaces standard compression fittings to create a more rigid imaging train, which is critical for preventing optical tilt and flexure.
Which specific focuser does this Starlight Instruments End Cap fit?
This end cap is compatible with Starlight Instruments' 3.5" Feather Touch focusers. It will not fit their 2", 2.5", or 3" models. It is crucial to match the end cap size to your specific focuser model.
Why is a threaded end cap like this Starlight Instruments model important for astrophotography?
A threaded connection is significantly more secure than a slip-fit or compression ring connection. For astrophotography with heavy cameras and accessories, this rigidity prevents the optical train from sagging or tilting, ensuring stars remain perfectly round across the entire image frame.
What are the thread specifications for this Starlight Instruments 3.5" End Cap?
The end cap features M85x1 female threads. This specification is designed to mate directly with the male threads on the Stellarvue 85mm Field Flattener.
Will this Starlight Instruments End Cap work with my Stellarvue SVX130T and its flattener?
Yes. If your Stellarvue SVX130T is equipped with a 3.5" Feather Touch focuser and you are using the compatible Stellarvue 85mm Field Flattener, this M85x1 end cap is the correct adapter to connect the two components securely.
I'm building an imaging train with a 3.5" Feather Touch focuser for capturing the North America Nebula (NGC 7000). Is this the correct adapter for my Stellarvue flattener?
Yes, if you are using the Stellarvue 85mm Field Flattener, this end cap is the correct component. Creating a solid, threaded connection is vital for long-exposure imaging of large targets like the North America Nebula (NGC 7000), as it prevents flexure that could occur as the telescope tracks across the sky.
