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Hi Mark and Leo,
Mark, not sure what brand of RC you have, but without a donut, off the top of my head I can't think of an easy way to do even the first laser collimation step.
My suggestion would be to ask IIS/Google if others know how to add a donut to an RC secondary. Removing the spider and mirror would not be a big deal, also not sure just how critical the spot needs to be. Perhaps just measuring in equidistant from the spiders' tips and pop a donut there might do the trick.
Leo, OK on the OCAL, mine is the Mk 1 version, and seems to work just fine.
On looking at my above posted zoom pics of the OCAL screen, I've decided that most OCAL users, me included, are continuously asking themselves "What the heck are all those different blurry circles that make up the picture?"
I've become quite familiar in the last few weeks with the various views looking down the rear of the OTA, so I'm going to make a pdf with pics, lots of pointers and comments, explaining what the various black, gray, shiny etc rings are to help interpret the OCAL screen a little better.
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