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Pictures
These are telescopes, so in cells - of sorts, and also in tubes if that's any use. See pictures. They are f/15 (f=900mm). One (blue tube) looks to be an air spaced doublet (you can see the spacers in one picture) while the other is more likely cemented. They have 0.965-inch plastic focusers at the other end.
I collected these with the intention of making a spectrohelioscope, but the price of H-alpha etalons came down enough so that I could buy one before I built the complex spectrohelioscope, so are now just sitting there. PM me if you are interested and we can come to some arrangement.
- Steve
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