Quote:
Originally Posted by ausastronomer
No I am not, but why do I need to be? Please enlighten me if something in the text, or commentary makes anything I have said above, or below incorrect, or that my assessment of that review, as being pretty useless from the point of view of an amateur astronomer, incorrect.
Having spent quite a bit of time with both the 10mm Delos and the 10mm Pentax XW and with the 6mm DELOS and the 7mm Pentax XW, in several different telescopes, I have had enough time to form a pretty accurate assessment on how both series of eyepieces perform in the real world, under the stars, in an amateur astronomers telescope, as perceived by an experienced amateur astronomy. I do own both. The differences between them are very subtle at best. In some criteria the Delos is best, in some others the 10mm Pentax XW is best. One is not a 16/20 eyepiece and the other a 12/20 eyepiece. You can take that to the bank and cash it in.
50% of the testing was done at F3.5. Less than 5% of the telescopes in use by the amateur astronomical community are faster than F4. So why test at F3.5 when 95% of the amateur astronomical community don't go there and never will.
The optical differences were differentiated at > lambda / 50. I don't know anyone with telescopes, eyeballs, or ability good enough to take advantage of that, or to pick a difference at an accuracy > lambda / 50.
Cheers,
John B
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Thanks Ausastronomer - Just wanted to confirm your level of French literacy
