Thanks Leo, sometimes being retired in the bush has benefits for lots of spare time, hence all my RC8 posts!
More happy snaps below for your edification, showing the first check of OTA collimation using the OCAL. It was also very close and only took a few minutes of finetuning both mirrors to bring it to my satisfaction.
The thing to look for in the OCAL picture is concentricity of all the rings compared to the green, red and blue OCAL alignment marker rings, which are adjustable and perfectly concentric. The cross hairs show the alignment with the centre dot, which is the OCAL chip sensor and should be smack bang over the secondary mirror donut.
After the initial Basic OTA collimation yesterday with the lasers, it was pretty close, and with the OCAL this morning, slight main mirror collimation screw adjustment moved the bright inner white circle under the blue marker ring, then secondary mirror screws fine tuned the sensor position under the cross hairs and Viola! it was done.
