Yes I started at about 150x and then 250x and finally around 400x , but at that the incruments of adjustement are so tiny as I said < 1/8th a turn on any given bolt , max ! .
OH yes , I dont use the diagonal when columinating , straight thru is the best .
But yes the images when properly columinated are well worth the time taken .
I have only done a proper columination once in 9 months , the Tak holds it very well .
Brian.