A quick look at Baader Hyperion Zoom Barlow
Baader Hyperion Zoom Barlow is a lens designed for Hyperion Zoom eyepieces, but can be used with other or with planetary cameras. It's a 3-element design, but different than typical 3-element APO Barlow. The design is told to be anastigmatic. The last lens is strongly convex (be careful not to scratch it) so it does differ from normal lenses. When used with Hyperion Zoom eyepiece it gives 2.2x magnification increase.
With the lens you will also get a 1,25" extender-adapter and T2 adapter. The lens assembly has a 1,25" thread and no collar so it can be hidden withing a 1,25" eyepiece holder. The 1,25" extender-adapter works as a collar - it gives 1,25" thread, but can't be hidden withing a 1,25" eyepiece holder. The T2 adapter works in a similar manner.
Convex lens and 1,25 thread
Lens bottom part with its own 1,25 thread
Planetary imaging
The lens can be used with other eyepieces and with planetary cameras. It's a very strong Barlow. When screwed to short nosepiece it gives more than 2x magnification increase with DMK21AU618 camera (I used a shorter nosepiece than the standard one you get with the camera). For fast Newtonian it should easily provide 5-6x magnification when put before the filter wheel or in general - further away from the camera sensor. There is a Baader 2" nosepiece to T2 thread that can be screwed into a filter wheel. This nosepiece has a T2 thread also on the 2" side so you can put the lens there.
Example astro-images
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