Astroimaging_filters : Message: Re: Baader 35nm Ha Filter

Hi Richard C, yeah, it may be the water. More likely the scotch, vbg.
If my testing just brings complaints, I can solve that quickly.

If needed I now have a scanning McPherson spectrograph accurate to +-
0.06nm that can be used for very accurate transmission testing, both
linear and log.

BTW, have you made any progress on doing interference testing on
filters?

Regards,
Richard

--- In Astroimaging_filters@yahoogroups.com, "Richard Crisp"
<rdcrisp@...> wrote:
>
> it's the water, John...
>
>
> ----- Original Message -----
> From: john hendry
> To: astroimaging_filters@yahoogroups.com
> Sent: Friday, December 19, 2008 1:20 AM
> Subject: RE: [Astroimaging_filters] Re: Baader 35nm Ha Filter
>
>
>
> I am a little mystified at what your gripe is with Baader. You
order a 35nm filter on the strength of the curve of a 45nm filter,
and you are surprised that they are different?John H.
>
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
> [Non-text portions of this message have been removed]
>

Expand Messages

Author

Sort by Date

Hi, I ordered and received a Baader 35nm bandpass Ha filter. While most are interested in narrowband Ha filters, my interest in this filter was to be used as a...

ssb73q

Dec 18, 2008
7:21 pm

You got what you have payed for: http://www.baader-planetarium.de/zubehoer/okularseitiges_zubeh/farbfilter.htm#halpha-ccd There is nowhere a claim by Baader...

Wolfgang Renz
aavso_rwg

Dec 18, 2008
9:19 pm

This is the Baader graph that I used to make my purchase decision: http://www.alpineastro.com/filters/H-Alpha_filter_curve.htm Richard ... fast...

ssb73q

Dec 18, 2008
11:43 pm

I am a little mystified at what your gripe is with Baader. You order a 35nm filter on the strength of the curve of a 45nm filter, and you are surprised that...

john hendry
napier58

Dec 19, 2008
9:20 am

Hi John, I saw the 45nm on the Alpine chart, but thought it a typo at the time of order. In any event, the group now has an independent transmission...

ssb73q

Dec 19, 2008
11:55 am

Yes, I saw the earlier post, the smudged one should clean up fine. I have the 7nm Baader Ha and it does a fantastic job.Good luck anyway.John H. [Non-text...

john hendry
napier58

Dec 19, 2008
12:15 pm

Hi, I just learned that the older 45nm Ha filter had the same Baader number, #245-8380, as the newer 35nm Ha filter, see: ...

ssb73q

Dec 20, 2008
11:53 pm

Alpine agreeded to take the filter back for a refund and will update their chart. Alpine has always been good to deal with. Regards, Richard ... While ... 7nm ...

ssb73q

Dec 19, 2008
11:35 am

Then complain at Alpine that they (and not Baader) linked the 35 nm Halpha filter entry: http://www.alpineastro.com/filters/filters.htm#H-Alpha to a probably...

Wolfgang Renz
aavso_rwg

Dec 19, 2008
10:43 am

it's the water, John... ... From: john hendry To: astroimaging_filters@yahoogroups.com Sent: Friday, December 19, 2008 1:20 AM Subject: RE:...

Richard Crisp
s2hao3

Dec 19, 2008
2:07 pm

Hi Richard C, yeah, it may be the water. More likely the scotch, vbg. If my testing just brings complaints, I can solve that quickly. If needed I now have a...

ssb73q

Dec 19, 2008
3:01 pm

Yahoo! Groups Tips

Did you know...

Messages

Yahoo! My Yahoo! Mail
	Sign In New User? Sign Up
		Tech - Groups - Help

Yahoo! Groups Tips

Did you know...

Best of Y! Groups

Messages