One thing that may help is a step ladder or something for him to lean on/hold on to. For the last few years I have been using a ladder as a leaning post and though it may seem silly (when I don't need a ladder with my f6 newt) it is now used every time. It is lots easier to keep still at the eyepiece and really helps to reduce fatigue (eye and body). With a foot on a step or arms wrapped around the ladder also takes some weight and makes for much more comfortable observing. I wouldn't be without it now. Hope it helps Chris. Someone else hopefully can help you with eyepiece type as I haven't owned a lot over the years. Cheers, Richard
