This adapter is made to work with our M69 thread which is used on our larger M69 threaded extension tubes. It will not fit onto other thread sizes.
This 2" adapter does many things.
- It serves as a 2" visual back for focusers that have an M63 female thread.
- It is a 360 degree rotator with nylon bearing surfaces.
- Unthread the 2" back and it will accept the newer versions of the two inch, .8X reducer/flattener or any accessory with the M54 X .75 thread.
- Unthread the first knurled ring and you have an M68 X 1 thread which accepts many flatteners including our SFF3 and SFF4 series.
Cnc machined and black anodized finish.
This rotator has three configurations. It is 20.75 mm in length when using the 68 mm female connection, 25.15 mm long connecting to the 54 mm female thread, and 37.25 mm long when using the 2" compression clamp. It has six nylon bearing screws, a Teflon thrust bearing and a thumb screw to lock rotation.
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Bought this so I can screw the field flattener/reducer into the focuser, and not have to rely on the compression screws in the eyepiece holder. This eliminates any sag in the imaging train. Works great! It also allows me to rotate the camera to the desired orientation, without introducing any extra play or sag. Very pleased!
As I added on my recent SV80A the rotator, I cannot use my 2x Siebert barlow. I cannot focus with the 1.25'" stellarvue diagonal because the barlow is 116mm long. So I can focus only with a short barlow which is not the best choice.