Ooh, .5 nice. Your own? Which scope or filter do you have and how did you take the pic through it? I have a 30mm Coronado PST at 1.oA and I dont think it lends itself well to affixing a camera. One day I might get the double stack option for it or save up and get the Lunt my old HS science teacher recommends.

yup 40mm double stack coronado PST, it is hard to photo through, not made for it, the view with your own eyeball is much better, but hard to share my eyeball ;) but there a trick to it, modify the usual projection tube method and t adapter

Always wanted a pink sun.

Awesome photo! Could you explain more about that filter and how it works with the camera? .05 nm (50 pm) would be down in the Xray band of the spectrum. How is a visible light camera able to make an image out of that?

That's not the center wavelength, it's the line width of the filter, so it's 656.28nm or 656.23nm to 656.33nm is all the wavelength it will pass. thus the sun is actually quite dim with all that rejection! normally you'd look at it with your eyeball, which looks better than with a camera, just because it was optimized for visual use not photography.
and they filter can get that narrow because it is a eatalon, of very high Q that is angle tuned to get they exact line for particular features

way beyond my technical expertise...

Vix