Yesterday I spoke with Wolfgang Lille about the Coronado BF blockingfilters
.
Only the PST 5mm block filter is a pure block filter !!!
From the BF15, BF 18 and BF30 all are glued with a prefilter ala a BG38 !!!
Dreadful......horrible
sunny Greetings
Achim
Sorry, I made a mistake.
Only the Coronado PST BF 5mm is glued with a red glass filter .
From the BF 15 upwards they are additional glued with an other prefilter like a BG38.
Visually terrible compared to the BF 5, I tested it myself at the German H-Alpha Meeting in Rüsselsheim.
- H-Alpha Meeting Rüsselsheim 2011.jpg (1.13 MiB) Viewed 6780 times
Here you see my sun construction in Rüsselsheim.
SW 6 "f8 FH refractor with 135mm front C-ERF, PST 5mm BF with internal ITF filter.
Dietmar Sellner, the organizer of the meeting, came with his selected Coronado BF 15 and put it on my system.
Oh yeah ... cruel no comparison to BF 5 from PST.
Useless !!!
Seen correctly ..... laugh, the ERF is fixed with parcel tape.
https://www.ruesselsheimer-sternfreunde ... pha-treff/