H-beta objects in the summer sky?

Now there are just three weeks to go before our planned astro-trip to the Canary Islands. Last weekend we had a meeting to discuss practical issues. During the meeting my friend informed me that he had bought a H-beta filter, and asked me if he should take it with him.

Of course, the filter is small, and doesn't represent any extra weight worth mentioning. However, I have to admit that I don't know about any objects in the summer sky where this filter is of any use. Any suggestions in the milky way from Sagittarius to Cygnus?

We have both O-III and UHC filters, and look forward to using them along with all our Naglers, Panoptics and Radians. But the H-beta is new to me, and the only objects I know about where this filter is of any use, are the Horsehead and California nebulae.

Inge S

Inge
I have read that Campbell's hydrogen star in Cygnus responds to the H-Beta filter. However, when I have tried it myself I have been most underwhelmed. I personally could see no benefit.

http://www.cloudynights.com/item.php?item_id=387

here is the article that Dan may be referring to: At long last, I just bought an OIII and bookmarked this article to help my decision.

I've read the Cocoon Nebula in Cygnus does well with H-beta.