I know this is an old thread and that the pool of people still interested in this scope is probably very small, but, encouraged by Ownthenight's posts, I have been trying to fit a Vixen GLH20D to my own ancient Spacemaster II, so far without success, and I am hoping someone here might have some experience to share.
I have the old Bushnell zoom eyepiece, which is dismal, and an 'ME15' bought cheaply from Action Optics in the UK some years ago. It gives a rather soft image and only a narrow view, so I wanted to give the scope, which must be 40 years old, one last chance.
I saw the GLH20D eyepiece on offer for 120 euros here in Germany and ordered it along with a Vixen GL25 wide, thinking one of them might work. The GL25 fits in the female mount, but had an out of focus spot in the centre, maybe because it protruded too far/not far enough into the scope body. The GLH20D was far too big for the male mount, which suggests that Ownthenight has a different version with a bigger mount. But hand-held, the GLH20D gave a great view and focused past infinity.
I have established that the male thread on my scope is M35x1mm. After measuring the GLH20D myself, I got hold of M35x1 to M42x0.75 and M42x1 adapters, but no joy. So I emailed Vixen, who said the eyepiece needs a mount with a M41.5x1 thread.
So: does anyone know where I can find an M35x1 to M41.5x1 adapter for a reasonable price? I think it would cost about 100 euros to get one custom-made here in Germany. That plus the eyepiece (130 euros) feels like too much money for what is still going to be a fairly weak setup for birding.
I am reluctant to consign the Spacemaster to retirement at an archery club or something similarly undemanding. But unless I can upgrade it at low cost, I think I would be better off putting the cash towards something like a used Nikon ED III or Opticron MM3/4.
Grateful for any tips.
