I have a SM90 EDT, Adjustable Flattener, Filter Holder, ASI 585 and a 120mini for guiding all on an AM5 mount. I have used this rig for the last 3 months to successfully image a number of Nebula so no problems with Back Focus . Now that the planetrs are back again I thought I would use my 4x (2") Powermate to increase the magnification so that I could image Saturn, Jupiter and Mars. I was advised to remove the flattener and replace it with the Powermate with the Camera directly attached to the Powernate using the 42mm T-ring adapter. However I cannot get focus, I must be doing something wrong or the advice I was given was incorrect, HELP!!!