On ebay I found a 0.1 nm filter pair for Halpha for $225.
http://www.ebay.com/itm/Optical-Inte...#ht_1200wt_905
It is unclear how large the filter is whether it fits in front of a 10cm objective.
Any ideas ?
An alternative can be a Baader solar foil in front of the objective lens and a 6nm Halpha eyepiece filter. But 6nm is way too wide ?
Using this ebay filter as eyepiece filter in combination with Baader objective foil renders a very dim solar image ????
Any ideas on this ?