I have an STI focuser for ST-7 (and 8/9/10?) cameras. It goes into the focuser where the 1.25" nosepiece would go and has a 300 line Ronchi grating on the other end through which you can evaluate your focus. I have now got a Mandel Wide-Field Adapter on my CFW8 and thus no nosepiece so I can't use this any more. Shipping will be $10 to North America, actual cost elsewhere.