Over the past 40 years of observing I have always used a tracking equatorial mount when planetary viewing, however, my habits and mount choices have been evolving toward alt-az mounts with slo-mo controls lately. The weight of the EQ mount has been one factor due to the mount frame weight plus the counter weight. The alt-az mounts are much easier to carry out, set up and are significantly lighter. I also read an article a few years back about eye fatigue that results from using tracking mounts where the observed object stays in the same place in the eyepiece field. I noticed that I would frequently re-focus the planet (particularly Jupiter) while observing. After switching over to an alt-az mount about a year ago I noticed that I re-focus less frequently because the planet appears to stay in focus as it drifts across the field of view. I admit that constantly having to adjust the alt and az slo-mo controls is a bit of a PIA, but I do think that the moving object does reduce eye fatigue and the illusion of a changing focus. Another nice advantage is no battery, wires, push button controls hanging from the mount, etc. Plus the diagonal does not have to be rotated throughout the evening. Is this just a "rant" from an old man, or have others experienced something similar?