Hi all,
I’m looking around for a pair of ultra narrow band filters to use with my 2600mc camera. I already have an NBZ to use with my fast scopes but need something a bit more tailored to the light polluted UK skies (Bortle 6-7). I have had good success with the NBZ even with the Squid nebula but the contrast has been poor in my local skies.Presently I’ve been looking at the Altair Astro 4nm certified DualBand Ultra filters. I’ve had good feedback from someone but I really need to look at more images before deciding - they are pretty expensive and my loathing of haloes is extreme! I’ve seen no images of known problem stars (for example Sadr, 52Cyg) so it’s a bit of a difficult investment decision.On the plus side these filters do specify out of band blocking (OD 4-5) ‘over the majority of unwanted visual wavelengths’ although cameras do have sensitivity outside the visual wavelengths.Has anyone experience if these particular filters or any others that are 4nm and have some guarantee of halo free design? I’m not interested in wider bandwidth since I have that covered with the NBZ or those that are known to produce haloes (l-ultimate and the like). Some images with problem stars would be great.
Any help gratefully received.
Robert
I’m looking around for a pair of ultra narrow band filters to use with my 2600mc camera. I already have an NBZ to use with my fast scopes but need something a bit more tailored to the light polluted UK skies (Bortle 6-7). I have had good success with the NBZ even with the Squid nebula but the contrast has been poor in my local skies.Presently I’ve been looking at the Altair Astro 4nm certified DualBand Ultra filters. I’ve had good feedback from someone but I really need to look at more images before deciding - they are pretty expensive and my loathing of haloes is extreme! I’ve seen no images of known problem stars (for example Sadr, 52Cyg) so it’s a bit of a difficult investment decision.On the plus side these filters do specify out of band blocking (OD 4-5) ‘over the majority of unwanted visual wavelengths’ although cameras do have sensitivity outside the visual wavelengths.Has anyone experience if these particular filters or any others that are 4nm and have some guarantee of halo free design? I’m not interested in wider bandwidth since I have that covered with the NBZ or those that are known to produce haloes (l-ultimate and the like). Some images with problem stars would be great.
Any help gratefully received.
Robert
