Baader Conversion Ring - M68x1(M)/T-2(M)

Its primary function is to adapt a component with a male M68x1 thread (like a focuser drawtube or a field flattener) so that it can connect to an accessory that requires a male T-2 (M42x0.75) thread. It effectively converts the end of your optical train to the more common T-2 standard.

Many Baader Steeltrack focusers terminate with a male M68x1 thread. You would thread this conversion ring directly onto the focuser's male thread. The ring then provides a male T-2 thread, allowing you to attach your T-2 threaded camera, off-axis guider, or filter wheel.

While any adapter adds some optical path length, this Baader conversion ring is designed to be as low-profile as possible. The exact optical path length is not specified, but it is engineered to minimize back-focus consumption while ensuring a rigid, non-flexing connection between your components.

It's important to distinguish between the two. This adapter uses the T-2 thread standard, which is M42x0.75 (42mm diameter, 0.75mm thread pitch). The older Pentax/Praktica "screw mount" for cameras is M42x1.0. While the diameter is the same, the thread pitch is different, and they are not compatible. T-2 is the universal standard in astronomy.

Yes, this is a perfect application. Thread the Baader M68/T-2 Conversion Ring onto the male M68 thread of your corrector. This will give you the standard male T-2 thread needed to connect your ZWO ASI camera and any associated T-2 spacers or accessories to achieve the correct back focus.

M68 (M68x1) is a larger-format thread with a 68mm diameter, often used on focusers and correctors designed for full-frame sensors to prevent vignetting. T-2 (M42x0.75) is a smaller 42mm diameter thread that is the most common standard for connecting cameras, filter wheels, and other imaging accessories.