I took a look at the 9mm Expanse ep's. Internal reflections kill these ep's. They were dreadful on Mars. Moon was gone before it got dark, so I couldn't try them on it. They worked ok for deep sky. I would use them over the stock 10mm Sirrius plossls I have for deep sky. I would also use them over the 9mm orthos just for the bigger FOV, but only for deep sky. I thought that the kidney beaning I saw in cyclops would render them totally useless, but they worked good when my pupils got fully dilated. The kidney beaning was mildly annoying on Mars and I think it would be terrible on the Moon. I think I may get the rest of the set for deep sky work until I figure out what I like in the widefield department.
The 25mm Orion Epics are very good ep's. Good thing Orion discontinued this line. The 25mm's are very nice. For their 55 deg AFOV, they are almost the equal of the 24 Pan. The Pan edged them out on edge sharpness and overall contrast. The stock 25mm Sirrius plossls I have are as good as the 25mm Epics. You get the extra 5 deg AFOV and a bit more comfortable ep in the Epic. I wish I could have tried these in other focal lengths. Maybe I'll order up a pair of the Celestron version. Anyone verified that these are really the same?
Clear skies,
Tom
The 25mm Orion Epics are very good ep's. Good thing Orion discontinued this line. The 25mm's are very nice. For their 55 deg AFOV, they are almost the equal of the 24 Pan. The Pan edged them out on edge sharpness and overall contrast. The stock 25mm Sirrius plossls I have are as good as the 25mm Epics. You get the extra 5 deg AFOV and a bit more comfortable ep in the Epic. I wish I could have tried these in other focal lengths. Maybe I'll order up a pair of the Celestron version. Anyone verified that these are really the same?
Clear skies,
Tom