I've been interested in using a CLS filter for some time now but I don't feel like forking over approximately $170.00 for a 2" astronomik model. If you reference Phil Harrington's article in my thread regarding tuning your eyepieces and filters, you'll see he designates it as a broadband filter and rates it a "4" on a 0-5 scale with M81 being easily visible. Imagers reportedly use this filter as well.
I can't say whether the Levenhuk 2" model, which goes for around $89.00, is the same as the aforementioned model. I could only find one review of it on a google search and the latter was a translated page from a Russian amateur who did a spectral test on it and described it as "pretty good" in meeting its design parameters as a deep sky filter. Levenhuk's advertizing states it can be used for photo-visual work so I may get one for use with my 2" eyepieces and report on its usefulness in suburban viewing. I find my astrotech 1.25" broadband filter works well with my 16" scope and a 10mm Ethos eyepiece for viewing some galaxies in front of my home whereas my Orion broadband model is too aggressive and dims the sky by a half a magnitude which makes it less suitable for viewing galaxies. My hope is the Levenhuk unit is a bit less aggressive than the Orion model and therefore may be of use in viewing certain galaxies. We shall see...
I can't say whether the Levenhuk 2" model, which goes for around $89.00, is the same as the aforementioned model. I could only find one review of it on a google search and the latter was a translated page from a Russian amateur who did a spectral test on it and described it as "pretty good" in meeting its design parameters as a deep sky filter. Levenhuk's advertizing states it can be used for photo-visual work so I may get one for use with my 2" eyepieces and report on its usefulness in suburban viewing. I find my astrotech 1.25" broadband filter works well with my 16" scope and a 10mm Ethos eyepiece for viewing some galaxies in front of my home whereas my Orion broadband model is too aggressive and dims the sky by a half a magnitude which makes it less suitable for viewing galaxies. My hope is the Levenhuk unit is a bit less aggressive than the Orion model and therefore may be of use in viewing certain galaxies. We shall see...