What is the main benefit of installing the PrimaLuceLab PLUS Adapter Plate on my HEQ5 mount?
Once you fit a PrimaLuceLab Vixen+Losmandy PLUS dovetail clamp (sold separately) on this plate, your HEQ5 accepts Losmandy-style bars as well as Vixen-style bars. The stock HEQ5 saddle accepts Vixen-style bars only.
Is this adapter plate compatible with the Orion Sirius EQ-G mount?
Yes. The plate suits both the Sky-Watcher HEQ5 and the Orion Sirius EQ-G.
Will I still be able to use my telescopes with Vixen-style dovetails with this adapter?
Yes, with a PrimaLuceLab Vixen+Losmandy PLUS dovetail clamp fitted to the plate. The plate itself does not clamp a dovetail; the PLUS clamp holds both Vixen "V-style" and Losmandy "D-style" plates.
How does this adapter plate fit into the PLUS system?
It connects your HEQ5 or Sirius EQ-G mount head to the PrimaLuceLab PLUS system. With a PLUS dovetail clamp on top, you can build on it with other PLUS components such as plates and guide rings.
I want to mount my 8" SCT with a Losmandy bar on my Sirius mount for imaging galaxies like the Whirlpool Galaxy (M51). Is this the right part?
Yes, together with a PrimaLuceLab Vixen+Losmandy PLUS dovetail clamp (sold separately). The stock Sirius saddle accepts Vixen-style bars only; with this plate and a PLUS clamp installed, the mount accepts your SCT's Losmandy-style bar. Check that your SCT and imaging gear stay within the mount's payload capacity.
How does this PrimaLuceLab adapter help with balancing a guidescope alongside my main refractor on an HEQ5?
Install a PrimaLuceLab Vixen+Losmandy PLUS dovetail clamp on this plate, mount your refractor's Losmandy-style bar in the clamp, and attach PLUS guide rings to that same bar to hold your guidescope. Sliding the bar in the clamp lets you balance the declination axis.