Very nice system Steve
Thanks! You were 100% correct earlier this year when you advised me of the abilities of Gen 2+ tubes. I picked up an XR5 Onyx tube and although it excels at general low power stargazing narrowband Ha filters and or stretching the focal length causes it to fall behind the Gen 3 devices.
But nothing beats first hand experience though, I like your style!
For general astronomy and even narrow band viewing, Gen 2 tubes have significant merit and should not be discounted. The same goes for Gen 1 tubes, particularly triple cascade tubes. I find great merit in all cathode types.
If ones sole interest is narrowband viewing, go with current state of the art Gen 3 cathode technology otherwise there are some spectacular views to be had with Gen 2 tubes such as those available from Photonis e.g. XD4, XR5 and INTENS
Within the spectral bandwidth that Gen 3 cathodes are the most responsive, Gen 3 cathode technology remains unbeatable.
Though the XR5 cathode technology of your XR5 tube limits spectral response characteristics in the bandwidth that Gen 3 is most responsive, the XR5 has short and long wave limits that make the bandwidth a bit greater than Gen 3 but not as responsive in the bandwidth limits of Gen 3.
Ironically, more astronomical research projects used Gen 2 image intensifiers than those that have used Gen 3.
Edited by cnoct, 05 October 2016 - 09:07 AM.