Coronado SM60 or Lunt LS75 Ha filter

[sheeny]

I'm looking to upsize my Ha filter for the ED80. Looking for a Lunt LS75 or Coronado SM60 Ha filter only - I don't need a blocking filter as I already have one.

If you have a matching adapter for an ED80 I'm interested in that as well!;)

Al.

[Merlin66]

Al,
Have you thought about doing a modded PST set-up?
All you need is an 80mm ERF (Baader) - sounds like you have the necessary BF and PST etalon.....

[sheeny]

No, not really, Ken. I sold my PST a while ago, but I presume you mean I could use the SM40 etalon?

ATM my heads been in the realm of using my ED80 with the Ha filter so it works as a solar scope, widefield and guide scope without changing scopes on the mount. However, if I really settle down into solar and spectroscopy with the L200, then I suppose I could mount a dedicated solar scope in place of the ED80.:shrug:

Al.

[Merlin66]

Unfortunately the modded design based around a SM40 type etalon is much more complex than using the etalon from a PST.....
See how you go with your Ad. Maybe a s/h PST +ERF +Vixen 80/800 would work out just as cheap....

[daveg]

HI Guys

I may be upgrading my modded pst (to a 120mm) so may have the following available -
C100ED tube assy cut to length, Baader 90mm D-ERF, so really all youd need is a PST n adapters.

As a matter of interest Ken would a Lunt b1200 work with a pst mod as i know thats the bf Al has. I think Al its worked ok with your sm40?

Dave Gradwell

[Strawb]

Dave,

I have just acquired a PST and have a spare donor scope so I'd like to talk
. I'll drop you a mail
Cheers

[sheeny]

Yeah the B1200 works fine with the ED80 and the SM40. Thanks for the offer but at this stage I'm still looking for a Ha filter for the ED80 rather than a dedicated solar scope.:)

Al.

Al.

[Merlin66]

I'm currently investigating an issue with a BF15 where it appears to work OK on a front etalon (SM60) but no good on a PST....
There was some discussion on CN regards the finesse and bandwidth differences between the Lunt and the Coronado. This certainly could have an negative impact.
I should have a hi-res L200 spectroscope available within the next few days to allow me to accurately measure the SM60/ PST and various blocking filters.
Keep you posted