What imaging filter for Star Clusters and Nebulosity

[Skyline]

As the title suggests. I will be using a modded dslr with a 130pds in bortle 7/8 skies. Whats your recommendations?

Thanks.

[vlaiv]

What sort of nebulosity?

Star clusters are generally not much affected by light pollution.

Nebulosity comes in two forms - emission type and reflection type.

For emission type nebulae (planetary nebulae, Ha region, SN remnants, etc) - you can get very nice results with UHC type filter. These filters disrupt color balance and make it impossible to get proper star color - but you can either accept that as a fact of life or shoot separate unfiltered exposures to get the color of bright stars (special processing needed that applies star mask or makes starless version and transfers color to stars only).

For reflection type nebulae - you are out of luck. These are the most affected by heavy LP (similar to galaxies) and only a general purpose LPS filter can help a bit. Look at Hutech IDAS P2/D1 type of filters for example.