I have for sale a brand new Explore Scientific HR Coma Corrector which I no longer require. It has the tunable top and comes with both M42 and M48 adapters as pictured. The M48 adapter has the much more common M48x0.75 thread (these were originally shipped with 1mm pitch thread)
This has never been under the stars but I have screwed the adapters on and off a few times when building a newtonian project that I no longer have.
