Focuser 8

• Focuser by Valdas Misevicius
• Single Focus : Variable Diopter
• Mount: 52 MM

No focus marks. Reversed focus ring.

As the name says this focuser is aimed at 8mm scopes, so it is the smallest single focus out there. It is made by Valdas Misevicius.

So, what's the deal with the Focuser 8? It goes in front of your double focus or locked focus scope (such as the Baby Hypergonar or the Aivascope) and it turns your system single focus. This one has 52mm rear threads and 67mm front threads for attaching VariNDs, Polarizer or even diopters for stronger closeups. It weighs 140g, so it adds next to nothing to your rig.

Focus throw is about 90 degrees and it ranges from 45cm at minimum focus to infinity. There are no focus distance marks, and some versions have focus gears, but others don't - like the one I'm using here. It doesn't extend much when close focused either, which is great, roughly one centimeter. Focus is reversed though, which always bothers me tremendously, and the build feels a bit flimsy if you're constantly racking all the way through.

The Focuser 8 has a hard time keeping up with the HCDNA. The corners are severely compromised not only by blur but also vignetting is introduced much early.

The Focuser 8 transformed the way I experienced the Aivascope Mk I, allowing me to go much more freestyle without introducing a ton of vignetting. The slim profile helps by not limiting your choices of taking lenses.