Morning & thanks for the feedback so far everyone :)
I did consider Pier 5 but knowing that that particular corrector suffers from reflection issues with filters i decided against it completely on that system I am afraid. If we do it it will be Pier-11
I will have a think about which filters may work best for all of us
Steve
Dear Steve,
indeed, it is good to think about which filters would work best on Pier 11. I do not have enough experience to help selecting between manufacturers. However, I can share some thoughts on the two Optolong filters I have been using so far. I image with a f/2.2 at home (Celestron 9.25 EdgeHD, Hyperstar 4, FL=516mm), I must say that the corner stars can get a bit of color decomposition. This is not the case in the center of the image. This is what one would expect with this filter at f/2.2. Given the focal ratio of Pier 11, I think this phenomenon could be less pronounced, at least from what I am reading on the web. Some images are attached to give you an idea of what I am talking about.
The L-pro filter does not cause this, but can cause a number of reflections, especially in the blue. A somewhat funny occurrence is the image I posted on the Witch Head nebula: The cold light of Rigel shining on the Witch ( Manuel Peitsch ) - AstroBin. I do however encounter such reflections (far see less dramatic) in instances where a bright star is in or very near the FOV. This may of course again be a side-effect of using f/2.2 ... but am not sure.
Hope this helps
Kind regards
Manuel