[Cyberman (Rob)]

Afternoon all. I recently modded a secondhand canon 600D by removing the LPF2 and leaving in the LPF1 filter. I think it is working well with fortunately little sensor tilt as far as I can tell. I recently posted a photo of the Stature of Liberty nebula in the beginner's section. My next step was to get a light pollution filter. My setup is a skywatcher quattro F4 250mm newtonian with the skywatcher quattro F4 coma corrector, which attaches to the canon with T adapter. I live in the northern light-polluted suburbs of Brisbane.
I need advice with which filter to get and where to put it in the optical train.
The retained LPF1 filter is an IR cut off filter. Is this adequate or should I get a filter which also has IR cutoff in it. Some possiblities are CLS ( no IR filter), CLS-CCD ( has IR filter) , L enhance, L extreme. I could get a clip in filter or a normal filter which ? might be able go into the T adapter? There seems to be little leeway to put it elsewhere as the sensor to coma corrector distance is 55mm. Is astronomik or optolong the way to go. Any experience or advice welcome.
Cheers,Rob.