Hi there
Posted this Q in another thread but suspect it may have become buried... (
http://www.iceinspace.com.au/forum/s...ad.php?t=17831)
I've been wondering if there is a minimum aperture for scopes/binos that O-III HB filters could be used with? Eg. would 100mm BT45 binos or an 80mm refractor be too small?
I guess my question is whether there is much light loss with these filters?
Thanks
Andrew