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Onag
We have several customers using the DSI II pro monochrome for guiding without any problem. The DSI does not have any IR blocking filter.
Focusing is a three step process. First you need to select the right extension tube(s), if any, to reach focus with imager and guider (see the DBF table in the ONAG manual) for your set up.
Now you can focus your imager as usual, then the ONAG included guider focuser (compression ring) is used for focusing the guider (about 9mm travel). You can use your Bhatinov mask for that exactly like for your imager, I do the same with my set up.
The ONAG manual and website FAQs give more information on that matter with some images, I suggest you have a look.
One thing I learned from experience and customer feedback is the importance of the right tracking software setting. The ONAG means you are guiding with the same focal length than imaging, for instance at prime focus.
The guider FOV is smaller than using a guide scope, therefore if you have experience with a guide scope you will need some time to learn the right tracking software setting (see the manual for advices). However this is not different than using an OAG for that matter, excepted that the integrated X/Y stage gives you access to your scope FOV. You can search for a guide star on, and off axis as well.
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