From: Alan Friedman <alan@greatarrow.com>

Date: March 29, 2009 4:18:39 PM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] New file uploaded to Astro_IIDC

Hi Alberto,

I know very little about the Thousand Oaks filter - though if it delivers .9 angstrom bandpass it should be suitable for imaging prominences and maybe even surface structures.

I would visit the Cloudy Nights solar forum:

http://www.cloudynights.com/ubbthreads/postlist.php/Cat/0/Board/solar

there is a thread with some discussion on this filter near the top of the list.

best,

Alan

On Mar 29, 2009, at 4:41 PM, albe albo wrote:

THX Alan.

your words are alway very kind.

The day after i did a M13, M57 (both luma and chroma with The Imaging Source). Then i grabbed a M82 but i didn't process it yet.

Now it started to rain heavily. The Moon is incoming. I hope to be allowed to do some decent moon after 4  months of hungriness!

Two days ago a friend of mine lent me a CCD Starlight Xpress for a night.

Humm... i was pretty impressed by the very low noise allowing better  DSO results  even in urban  skies.

For the moment i will continue with my DMK DBK (i'm affectionated  and... with no money for a CCD!) but in my mind now there ia little bug eating my brain...

I 'd like to ask you a question: i saw a Thousand Oaks Halpa filter to apply to a normal scope (opening 80mm) that would fit perfectly on my 80ED.

The question is: would  it  be better a Coronado PST or the ThousandOaks filter?

Do you know them?

http://www.thousandoaksoptical.com/halpha.html

Thank you in advance

Wishes

Alberto