|
Red ERF filters
I'm sure the guys at Surplus Shed will look after you! The filter is 110mm diameter and 6.6mm thick.
I checked with Patrick at APM ( Agents for Baader C-ERF) and he confirmed that there are NO transmission curves available for the Baader C-ERF, but did say the bandwidth was supposed to be between 600-700Nm only. Sounds very much like the #25 + UV-IR combo.
Maybe the clouds will clear later......maybe
BTW
Anyone considered incorporating an SM40 etalon in parallel to the PST( not infront of the objective, but screwed onto the PST etalon) to give larger aperture opportunities with increased Ha resolution (<0.5A).... An interesting thought!!!!!
|