Yes the UHCS is a more severe filter. Im thinking the idas LPS is more similar to the Astronomik CLS, in being a less severe filter that would work better on broadband emission objects like reflection nebulae and galaxies. Ive tried the UHCS filter on galaxies, it needs a lot more exposure to avoid loosing too much from the galaxy, and yes it does alter colour balances more due to its more severe filtering. It does bring out hydrogen areas in galaxies though.
Im thinking the UHCS would be a better filter from very light polluted places and imaging emission nebulae. The LPS or CLS better for darker areas, or imaging broadband emitters.
I only use the IDAS uv/ir as when I ordered my moded camera I didnt specify an onboard IR cut filter, rather I went for clear glass as I want to image in infra red from time to time, in which case I remove the uv/ir filter and put on a 800Nm uv PASS filter (jet black to look at, passes no visible light at all)
For an instand comparison of the UHCS and LPS, go to
http://www.iceinspace.com.au/forum/s...ad.php?t=28773
and
http://www.iceinspace.com.au/forum/s...ad.php?t=28707
Both taken with modded Canon cameras so they make a good comparison, though we both processed them differently to suit ourselves so colour balance will vary.
Scott