Guest Kheldar Posted December 23, 2013 Share Posted December 23, 2013 (edited) Due to upgrade these are up for grabs (Now sold) Excellent condition, Ha - £70 collected Unused, Hb - £45 collected Edited December 27, 2013 by Kheldar Link to comment Share on other sites More sharing options...
T A WOW Posted December 23, 2013 Share Posted December 23, 2013 Are these any good for visual? Also 1.25" or 2"? Link to comment Share on other sites More sharing options...
red dwalf Posted December 23, 2013 Share Posted December 23, 2013 How would the baader 7nm filter stack up with my set of lrgb astronomik filters Stephen ? I was on the look out for a astronomik 12 nm filter but not sure if I should go for the 7 nm option. Any help thanks Link to comment Share on other sites More sharing options...
Sheila Posted December 23, 2013 Share Posted December 23, 2013 all I can say is when i bought my filters they said the narrower the better up to 5nm in the UK. So I would have to say 7nm must be much better then 12 IMHO. I dont think the Baaders have the bad halos of the astronomics, never noticed them on Stephens images too much. Sheila Link to comment Share on other sites More sharing options...
+Ibbo Posted December 23, 2013 Share Posted December 23, 2013 having not long ago bought the 7nm as an upgrade to the 12nm which I am very happy with i would say go for the 7nm Link to comment Share on other sites More sharing options...
Guest Kheldar Posted December 23, 2013 Share Posted December 23, 2013 Are these any good for visual? Also 1.25" or 2"? 1.25 (post edited thanks) and no, I'm afraid these are imaging filters How would the baader 7nm filter stack up with my set of lrgb astronomik filters Stephen ? I was on the look out for a astronomik 12 nm filter but not sure if I should go for the 7 nm option. Any help thanks I'm not entirely sure what the question is regarding stacking with the LRGB filters, but in short if you're considering HaRGB then it will stack out just fine. As to bandpass, Steve has just gone from 12 to 7, I'm going from 7 to 5 ... the narrower the better Apart from 3nm, we just don't have the skies for that in the UK Link to comment Share on other sites More sharing options...
+Ibbo Posted December 23, 2013 Share Posted December 23, 2013 (edited) and I will be going for 5nm when I have the money but I think a new chuck for the lathe is first Edited December 23, 2013 by Ibbo Link to comment Share on other sites More sharing options...
red dwalf Posted December 23, 2013 Share Posted December 23, 2013 Sorry Stephen, I wasn't to clear, what I was getting at was would they fit I.e. suitability with my set of astronomik filters and I take it it's parfocal. Link to comment Share on other sites More sharing options...
Guest Kheldar Posted December 23, 2013 Share Posted December 23, 2013 Sorry Stephen, I wasn't to clear, what I was getting at was would they fit I.e. suitability with my set of astronomik filters and I take it it's parfocal. I see no reason why they would not suit, maybe Steve can give you a better answer on that As to parfocal, that's probably unlikely being of different makes - what I can say though is my Baader L is almost parfocal with the Ha Link to comment Share on other sites More sharing options...
+Ibbo Posted December 23, 2013 Share Posted December 23, 2013 (edited) I would say they would not be parfocal but then again nor are my RGB astromomics they are close but really shows up with the planetary imaging at 5m f/l The only time use the filter wheel now is when I do planetary with DSO's I tend to do 1 filter /night (or longer) and now I use auto focusing do several re focusings a night so all in all parfocal is not an issue for me Edited December 23, 2013 by Ibbo Link to comment Share on other sites More sharing options...
red dwalf Posted December 24, 2013 Share Posted December 24, 2013 Thanks steve Link to comment Share on other sites More sharing options...
glider Posted December 24, 2013 Share Posted December 24, 2013 If you think about it, even if the filters are parfocal that's not the whole story. It's a waste of time if the scope itself focuses the wavelengths in 3 different places. So the better the scope the more benefit you gain from having parfocal filters. To the limit that with something like at ST80 you'd still be focusing every colour individually. I think? Link to comment Share on other sites More sharing options...
Guest Kheldar Posted December 27, 2013 Share Posted December 27, 2013 Ha now sold, Hb still available Link to comment Share on other sites More sharing options...
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