Hi Micheal.
Thanks for your comments.
The main reason I used the IDAS was simply because I couldn't find my 2 inch IR/UV filter.
Rather than loose the opportunity to get some images I went with it.
The IDAS filter is described as following:
Unlike other light pollution suppression filters, IDAS filters are specifically designed for balanced color transmission using the IDAS unique Multi-Bandpass Technology (MBT) process. The balanced transmission allows color photographs to be taken with minimal color cast to broadband emission objects such as stars, galaxies and globular clusters.
Full product info in link here
https://cloudbreakoptics.com/product...lps-filters-p2
Happy to do a comparison with UV/IR and no filter.
As for the unguided subs.
Yep, as Martin would agree, the mount and PA are the foundations to good imaging.
Thanks again.
Paul.