Polar align with an angled viewfinder
When living in Northern (or Southern) as I do at a latitude of 60 degrees there is difficult to look through the polar scope. I have to do something about it. I could built some electronic viewfinder, but that involve more electronics that has to be powered. For my travel mini mount I want it as simple as possible. Long time ago I had an angled viewfinder on my SLR camera. It worked but the image was a bit dim. Maybe something that I can use to my polar scope, or? When I googled on it I of course found that others already had done this. Here is my version of the angled viewfinder.
I bought a simple angled viewfinder on Ebay, it has selectable magnification, 1x or 2x, that can be useful. There are a lot of other versions of view finders too and maybe you already have one laying around from your old SLR camera.
The feeling is a little bit plastic but the function looks to be good. This viewer fits directly on my Canon EOS 6D camera, but there are a lot of adapters included to other cameras as well.
This is the entrance to the viewer with a rectangular mount.
Of the six included adapters I found the Nikon adapter fits best on my Star Adventurer mount's polar scope.
I have to build a holder between these two parts, I have seen there are drawings to 3D printers that can be downloaded to made this part, but I don't have a 3D printer.
My girlfriend had a couple of these old film canisters, they fits almost perfect after some modifications.
Cut the length and made a hole at the end.
With some tape on the polar scope I could easily press the tube on the polar scope.
Maybe it doesn't look very good, but now I can do a test if the function is up to my expectations.
This is how it looks when mounted on the polar scope. I tested it from my balcony, and the image is clear and bright. This should work.
For you who have a 3D printer maybe this is useful, it looks to be same as I have:
Or a ready made adapter, tips from Birderman APT forum:
Now I have to test this on real astrophotographing, if I can get the polar align better then I can have longer exposure times or longer focal lengths. It should work on my EQ6 mount also, but normally I polar align with the drift align method in that case.
This was the test object:
To get it even better I need a better adapter to the polar scope and a holder for the red lamp.