What is the main purpose of the Baader Hyperion 11mm Extension Ring?
This ring's primary function is to add exactly 11mm of optical length between a Hyperion eyepiece and the DT-Rings SP54/M28 and SP54/M37, which require it for connection.
Is this 11mm ring a back focus spacer for my Baader MPCC coma corrector?
No. It is made for Hyperion eyepieces: it threads onto the eyepiece SP54 thread and is required to connect the DT-Rings SP54/M28 and SP54/M37.
What accessories use the SP54 thread on the Baader Hyperion Extension Ring?
The SP54 thread is the native system thread on Baader Hyperion eyepieces (revealed when the rubber eyecup and/or the silicone thread-protecting ring is removed) and is used across their adapter system. This 11mm ring is designed to connect directly to these eyepieces for projection imaging or to other Baader SP54 accessories and T-rings.
Can I stack this 11mm Baader ring with other extension rings?
Yes, the Baader system is modular, and you can stack multiple SP54 rings to create custom lengths. However, for maximum rigidity and to avoid potential tilt, it is always recommended to use a single extension ring that is closest to your required length rather than stacking many smaller ones.
Will this 11mm ring work with non-Baader equipment?
Yes, it will thread onto any astronomy accessory that has a matching male or female SP54 thread. While designed for the Baader system, the standardized threading allows for cross-brand compatibility where SP54 is used.
Is the Baader Hyperion 11mm ring better for visual observing or astrophotography?
This ring is intended for photography with Hyperion eyepieces. It carries the DT-Rings SP54/M28 and SP54/M37 and is not needed for standard visual observing. An exception would be for eyepiece projection photography, where this ring would be used to set the distance between a Hyperion eyepiece and a camera sensor.
