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Red dot or 1:1 finder
I do have red-dot finders for quick find wider field views in a 4" and they are nice and small and tend to fit in typical finder scope brackets.
Just in case you are asking for a 1:1 heads up finder that is a wonderful complement to most optical finder scopes then I would strongly suggest a Telrad for higher mag dim target finds if you are visual and at 1000mm focal length or greater.
The telrad as you may know is a 'beast' and is very large but with it's dual circles of 1 and 2 degree radius it is difficult to beat for accuracy of a find due to it's ease of positioning near field stars a few degrees away. It is remarkably accurate. If you have a transparent overlay for your charts OR a computer sky atlas with telrad sight (most have that) it is great.
For 1000mm and up deep sky work, Telrad wins hands down in my book.
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