Peter Ward has one and has posted a few images with it on the deep sky part of the site.
Basically its an EOS R with a Ha friendly filter plus it can do 30X magnified view to help with focusing (stock camera does up to 10X).
It has a factory calibrated custom white balance to reduce the excess red.
There is an Alan Dyer review of it if you google that.
Sounds good but its AUD$3999. I paid $2100 for my EOS R so its quite a premium.
If you can live without the 30X focusing aid then a regular EOS R modified would probably do similar and make your own custom white balance.
Greg.
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