I wanted to stuff the filter wheel with the highest quality glass. But...
- I'm limited to 1.25" filters.
- Chroma 1.25" filters don't fit. https://www.cloudyni...ma#entry9693265
- Astrodon filters have a blue cut on lower wavelength than I'm currently using (Baader UV-IR @ 426 nm) and I'm worried about bloated blue stars. https://www.cloudyni...ma#entry9410246
- If I poke around at specifications, the Astronomik Deep Sky RGB appear to fit the bill, but they are 1mm thick substrate.
So the heart of the question is, if I go ahead and get the Astronomik Deep Sky RGB, and I use an OAG, am I now limited to 1mm thick filters for narrowband also? The Astronomiks are 6 nm bandpass - am I excluding myself from the Astrodon 3 nm bandpass (3 mm substrate) because the filter thickness will change my focus enough to throw off my OAG?
Kit currently consists of WO Star 71, QHY OAG-s, QHY CFW3S 7x1.25, QHY 183M. Usually imaging from an Orange / Yellow light pollution zone north of Detroit.
Does 'parfocal' REALLY matter? I can refocus on filter swap but the OAG is stuck at it's focus and that's it.
On the plus side, the cost difference between Chroma/Astrodon and Astronomik for a full RGB IR Ha OIII SII set is almost my next telescope.
Thanks in advance for your experience and opinions.