|
First Trial of the ERF Combo!!!
Though light cloud ( between the big black stuff....it's now raining; again!)
managed to get the filter tested with the ED80.
Set-up: UV-IR, #25 filter, ED80, PST etalon and BF10
Solar image focusses OK; PST etalon "tunes" OK There's a bit of background reflection ( need to tilt ERF?) but all in all a very pleasant sight. No heat build up and a reasonably bright image. No surface detail but a small(?) curtain prom at 5 o'clock ( with diagonal)
Tried to insert the x2 Barlow ( to get >f10) before the etalon but could not focus. Ended up with a 90mm spacer between the Barlow and the ED focusser to get it to image. Didn't see any/ much difference in the performance of the etalon tuning.... actually best views were with the ED (no barlow) and the 21mm TV Plossl.
This at least proves out the capability ( and safety) of the ERF combo.
Weather permitting I'll take some photos a) with the 40mm PST and b) with the ED Combo set-up to allow a comparison.
|