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I'm very keen on one of these, except I don't want to buy more narrowband filters just for this scope hahaha. I might get one and keep it just for LRGB imaging at dark sites.
Nice pics and write up, looking forward to seeing some results from it!
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I do love a newtonian..I so was close to buying one of these this week albeit the 130-AL but I bought a mount instead. Interested to see how easy you find it to work with this second generation.Are you fitting an EAF? I read somewhere they are a tight fit because of the focuser orientation and not being able to rotate the focuser on this new version?!
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As I'll be using a Player One Poseidon-C colour camera (IMX571) I don't really need any additional filters. Maybe the Askar C1 and C2 at some point, but for now the UV/IR and Ha+Oiii dual narrowband filters I allready have will do nicely. And yes, the UV/IR filter is needed as Player One doesn't have them preinstalled on their cameras I used to have a player one camera so I'm 100% aware that you need a uv/ir cut. Narrowband filters tend to only work properly with f/3.5~f/4. Otherwise you suffer bandpass shift. The f/2.8 scopes really need specific narrowband filters designed for f/3 and faster scopes... the c1 will be OK because it's bandpass is so wide. My narrowband filters are 3.5nm, and if i used the Ha filter with a f/2.8 telescope, it would not capture Ha, but rather something 2.5~3nm away... I'd need a new set of narrowband filters to do narrowband imaging with this scope.
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Alex Nicholas:
I used to have a player one camera so I'm 100% aware that you need a uv/ir cut. Narrowband filters tend to only work properly with f/3.5~f/4. Otherwise you suffer bandpass shift. The f/2.8 scopes really need specific narrowband filters designed for f/3 and faster scopes... the c1 will be OK because it's bandpass is so wide. My narrowband filters are 3.5nm, and if i used the Ha filter with a f/2.8 telescope, it would not capture Ha, but rather something 2.5~3nm away...
I'd need a new set of narrowband filters to do narrowband imaging with this scope. Band shift occurs at any angle other than null, and it will be showing at f/4 compared to an f/6-f/8 system. CO also would make things rather worse than for an unobstructed telescope. Finally, at f/2.8 even wider bandpass will show shifting and you may run short of Ha in some case (where the Ha signal is of the same level of the Hb). Fast narrowband filters are the answer in these cases (ALP-T).
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andrea tasselli:
Alex Nicholas:
I used to have a player one camera so I'm 100% aware that you need a uv/ir cut. Narrowband filters tend to only work properly with f/3.5~f/4. Otherwise you suffer bandpass shift. The f/2.8 scopes really need specific narrowband filters designed for f/3 and faster scopes... the c1 will be OK because it's bandpass is so wide. My narrowband filters are 3.5nm, and if i used the Ha filter with a f/2.8 telescope, it would not capture Ha, but rather something 2.5~3nm away...
I'd need a new set of narrowband filters to do narrowband imaging with this scope.
Band shift occurs at any angle other than null, and it will be showing at f/4 compared to an f/6-f/8 system. CO also would make things rather worse than for an unobstructed telescope. Finally, at f/2.8 even wider bandpass will show shifting and you may run short of Ha in some case (where the Ha signal is of the same level of the Hb). Fast narrowband filters are the answer in these cases (ALP-T). Yes, this is what I mean. Any faster than F/4 or so, with a 3 or even 6nm filter will start to be problematic. As I'll mentioned, the Askar c1 filter being very wide at 15nm Ha, and 35nm OIII MIGHT be OK at f/2.8... however, with my 3.5nm filters, or even the askar D1 I used to have, you will run into trouble.
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My tri-band filter (2 in fact), the L-ENH, shows a severely reduced transmission in Ha despite being of around 14nm wide when tested @ f/2.8. I don't want to think what would happen with a CO of 45% (tested on a lens on my side).
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