Unitron eyepieces + telescope question

[ralph1]

Hi all, I have two unitron kellners, a 25mm and 12.5mm in 0.965 inch barrels and I want to know if it is worth getting an adaptor to use them in my current telescope and future one I am building. I currently own a 6mm orion edge on, a 15mm celestron kellner and a bintel 30mm superview. The current telescope is a 130mm F/5 and the one I'm building will be a 175mm F/13.

I also have a refractor with 'topic astronomical telescope' on the nameplate(I don't know the technical name) and google wouldn't reveal any information on it.:eyepop: If anyone knows about this telescope, their knowledge would be appreciated. i.e. optical quality, mechanical quality etc. It is a 60mm F/15
Thanks, Ralph

[Tropo-Bob]

The Unitron Kellners work best at longer F ratios. However, they have a small field of view (aprox 37-40 degrees) by the standard of eyepieces available these days. A adapter does not cost much, but then again, I do not think that these eyepieces will be of much use either.

I have a 25mm Unitron Kellner and have oddly found that the best use for it is as a low powered microscope (or high powered magnifying glass) when viewing small objects by 'reverse' viewing though the eyepiece.

A final word of caution: I once ruined a very good star diagonal by dropping an 1 inch eyepiece into it (in the dark) and forgetting the adaptor. It cracked the mirror of the star diagonal. Sad really, and costly.