canon ef 135mm f2 l

flickr

IC 1396 - Sh2-129 narrowband by Remidone
Via Flickr:
Camera: ATIK 383L+ sensor -20°C with Atik EFW2 Optics: Canon EF 135mm L f2@f4 Filters: Baader 2″ Exposure time (seconds): OIII: 4×1200 bin 2×2 SII: 3×1200 bin 2×2 HA: 10×1200 bin 1×1 Guiding camera: MZ5m on TS 8×50 Finderscope Place: Fontecorniale (PU) Italy Date: 30/07/2011_06/07/2013