Quote:
Originally Posted by ausastronomer
Hi,
I have never compared them but I can guarantee you the 5 element modified plossls like the Celestron Ultima are excellent sharp eyepieces. These eyepieces were made in Japan and sold under several different names including Celestron Ultima, Orion Ultrascopic, Antares Elite and Parkes Gold Series. The Meade 5 element Japanese made modified plossls that Don referred to earlier are also very similar to these eyepieces. As Don mentioned the Clave Plossls were very sharp in slow scopes but had poor off axis performance in fast scopes. Their light throughput is also down a little compared to modern eyepieces like the 5 element modified plossls. In addition the Clave Plossls have a very warm colour tone. Probably the warmest I have seen in any eyepiece. On Jupiter that's a good thing, but on just about all other targets I don't really like it.
The above all having been said. I probably prefer decent orthos like the University Optics HD or the Baader over a good plossl. That's just personal preference and there is very little in it. There would be a lot of observers who would prefer plossls to orthos. However, a short focal length ortho will have slightly more eye relief than a plossl of the same focal length.
Cheers,
John B
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Thanks john,
I have read great things about the current baader classic orthos the 18mm looks good, has anyone tried the old kellner circle t's made in japan would they still stack up?
Regards chief