CLS filter for Bortle 4?

[Jezphil]

Newbie question here. I'll be out with my telescope in a couple of days (for only the third time) in a dark field in north Kent. Aiming for DSO shots of the Western Veil Nebula. The site in a field has Bortle rating 4. That's pretty good compared with my Bortle rating 8 of SE London. However, should I still consider using my Astronomik CLS filter? Or is it not necessary in these darker circumstances? Thanks in advance. 

Edited July 28, 2020 by Jezphil
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[Hallingskies]

My own area of Kent is Bortle 5-6 and my own experience of a CLS filter is that it doesn’t seem to do an awful lot for you.  I wouldn’t bother in Bortle 4.

[PeterCPC]

I am in (allegedly) a Bortle 4 area and I find that an IDAS D2 helps.

Peter

[Jezphil]

Thanks for your replies both. Much appreciated. I'm trying to avoid buying any more filters for now after the initial outlay, so will see how it goes without. Lots to learn.... until a few days ago, I thought a 'flat white' was a coffee.