Samster

28 minutes ago, johninderby said:

This shows the idea. Also good enough to check for sunspots.

https://www.teleskop-express.de/shop/product_info.php/info/p728_TS-Optics-Solar-filter-for-50mm-viewfinders---with-Baader-solar-screen.html

 

Wow that looks just the job. And a proper cell for the filter. Looks like the old Orion USA solar filters. Just need a 50mm finder.

2 hours ago, johninderby said:

You should have put some of the film on the finder. Makes a great solar finder particularily if you use a 9x50 finder and you can buy filter cells to fit the 9x50 finder as well.

That sounds like a great idea. I will keep an eye out for a cheap 9x50. Or check Astroboot.

I make a new filter every new season. I ask for a new Baader solar film every xmas, throw away my old filter regardless. I check the filter religiously through out the year. But for the sake of £18 its worth replacing yearly. 

I also converted an old 6x30 finder into a solar finder. Removed the optics, put a dust cap at the front with a pin hole and a transparent dust cap at the rear. That projects a white dot onto the rear cap and makes lining up the sun a breeze.