White light solar viewing with a Herschel wedge
How many of you who are using a Herschel wedge for white-light viewing are also using an IR & UV blocking filter ahead of the wedge?
I use a solar spectrum and ND filter with the wedge. Gives a pleasant greem image. On Mar 16, 2015 10:42 AM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
How many of you who are using a Herschel wedge for white-light viewing are also using an IR & UV blocking filter ahead of the wedge? _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
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Thanks Ziggy. I just got my hands on a Lunt 2" wedge. It includes an internal ND3 filter, and according to Lunt, that's all you need for safety. A polarizing filter is suggested so you can fine-tune the image brightness to suit the magnification, but that's not a safety requirement. I've read that some people are urging use of the IR & UV blocking filter ahead of the wedge, as a further precaution, so I'm looking for folks who have some experience with the blocking filter. I've ordered one (Baader) from Agena, should be here by next weekend. With luck I can bring my new white-light setup to Winchester Park next Saturday. I've replaced the 50mm refractor & Baader filter, with an 80mm refractor & Lunt wedge. Used on the same mount with the double-stack PST. You going to Winchester on Saturday? On Mon, Mar 16, 2015 at 11:23 AM, Siegfried Jachmann <siegfried@jachmann.org
wrote:
I use a solar spectrum and ND filter with the wedge. Gives a pleasant greem image. On Mar 16, 2015 10:42 AM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
How many of you who are using a Herschel wedge for white-light viewing are also using an IR & UV blocking filter ahead of the wedge?
The first scheduled Winchester Pars sunparty is April 4th. That same morning, btw, is a very short lunar eclipse. You may want to re-think putting the filter ahead of the wedge. My ND3 and solar spectrum filters are behind the wedge. I find using just the ND3 filter is too bright. If you want white light you may want to use an additional 12.5% filter. I consider the green solar spectrum filter also as "white" light. But id you want really white "white" light use just a series of ND filters. Sig On Mon, Mar 16, 2015 at 11:40 AM, Chuck Hards <chuck.hards@gmail.com> wrote:
Thanks Ziggy. I just got my hands on a Lunt 2" wedge. It includes an internal ND3 filter, and according to Lunt, that's all you need for safety. A polarizing filter is suggested so you can fine-tune the image brightness to suit the magnification, but that's not a safety requirement.
I've read that some people are urging use of the IR & UV blocking filter ahead of the wedge, as a further precaution, so I'm looking for folks who have some experience with the blocking filter. I've ordered one (Baader) from Agena, should be here by next weekend.
With luck I can bring my new white-light setup to Winchester Park next Saturday. I've replaced the 50mm refractor & Baader filter, with an 80mm refractor & Lunt wedge. Used on the same mount with the double-stack PST.
You going to Winchester on Saturday?
On Mon, Mar 16, 2015 at 11:23 AM, Siegfried Jachmann < siegfried@jachmann.org
wrote:
I use a solar spectrum and ND filter with the wedge. Gives a pleasant greem image. On Mar 16, 2015 10:42 AM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
How many of you who are using a Herschel wedge for white-light viewing are also using an IR & UV blocking filter ahead of the wedge?
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-- Siegfried
The first scheduled Winchester Park sunparty is April 4th. On Mon, Mar 16, 2015 at 2:55 PM, Siegfried Jachmann <siegfried@jachmann.org> wrote:
The first scheduled Winchester Pars sunparty is April 4th. That same morning, btw, is a very short lunar eclipse.
You may want to re-think putting the filter ahead of the wedge. My ND3 and solar spectrum filters are behind the wedge.
I find using just the ND3 filter is too bright. If you want white light you may want to use an additional 12.5% filter. I consider the green solar spectrum filter also as "white" light. But id you want really white "white" light use just a series of ND filters.
Sig
On Mon, Mar 16, 2015 at 11:40 AM, Chuck Hards <chuck.hards@gmail.com> wrote:
Thanks Ziggy. I just got my hands on a Lunt 2" wedge. It includes an internal ND3 filter, and according to Lunt, that's all you need for safety. A polarizing filter is suggested so you can fine-tune the image brightness to suit the magnification, but that's not a safety requirement.
I've read that some people are urging use of the IR & UV blocking filter ahead of the wedge, as a further precaution, so I'm looking for folks who have some experience with the blocking filter. I've ordered one (Baader) from Agena, should be here by next weekend.
With luck I can bring my new white-light setup to Winchester Park next Saturday. I've replaced the 50mm refractor & Baader filter, with an 80mm refractor & Lunt wedge. Used on the same mount with the double-stack PST.
You going to Winchester on Saturday?
On Mon, Mar 16, 2015 at 11:23 AM, Siegfried Jachmann < siegfried@jachmann.org
wrote:
I use a solar spectrum and ND filter with the wedge. Gives a pleasant greem image. On Mar 16, 2015 10:42 AM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
How many of you who are using a Herschel wedge for white-light viewing are also using an IR & UV blocking filter ahead of the wedge?
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-- Siegfried
-- Siegfried
Chuck are you OK? The 21st is this coming Saturday. If there was one in February it would have been at the museum. On Mar 16, 2015 6:09 PM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
What do you know, you're right. I swear when I looked at the SLAS calendar last week, there was one on the 21st.
On Mon, Mar 16, 2015 at 2:55 PM, Siegfried Jachmann < siegfried@jachmann.org> wrote:
The first scheduled Winchester Park sunparty is April 4th.
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Just very, very busy lately and running on not enough sleep. Things are settling-down again and should be back to "normal" soon. On Mon, Mar 16, 2015 at 6:12 PM, Siegfried Jachmann <siegfried@jachmann.org> wrote:
Chuck are you OK? The 21st is this coming Saturday. If there was one in February it would have been at the museum. On Mar 16, 2015 6:09 PM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
What do you know, you're right. I swear when I looked at the SLAS calendar last week, there was one on the 21st.
Normal for you is not normal. :) On Mar 16, 2015 6:16 PM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
Just very, very busy lately and running on not enough sleep. Things are settling-down again and should be back to "normal" soon.
On Mon, Mar 16, 2015 at 6:12 PM, Siegfried Jachmann < siegfried@jachmann.org> wrote:
Chuck are you OK? The 21st is this coming Saturday. If there was one in February it would have been at the museum. On Mar 16, 2015 6:09 PM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
What do you know, you're right. I swear when I looked at the SLAS calendar last week, there was one on the 21st.
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It's close enough! On Mon, Mar 16, 2015 at 6:17 PM, Siegfried Jachmann <siegfried@jachmann.org> wrote:
Normal for you is not normal. :)
On Mar 16, 2015 6:16 PM, "Chuck Hards" <chuck.hards@gmail.com> wrote:
Just very, very busy lately and running on not enough sleep. Things are settling-down again and should be back to "normal" soon.
Makes more sense to me to put all the filters behind the wedge, I was just going by what an experienced solar observer had posted on CN. I have 12.5% & 25% ND filters, but also just picked-up a variable polarizing filter, so I can dial-in the exact amount of extinction desired. I've looked through your Baader wedge and solar spectrum filter, it's a very sharp view. I'll be using my setup with an 80mm f/7 University Optics "kitscope" from the old days. Turns out it's the same OTA offered by Unitron for a few years before they folded and semi-APO in performance. Your wedge setup is what convinced me to abandon the Baader film for white-light. It's good, and ecconomical, but not nearly as sharp as a good filtered wedge. On Mon, Mar 16, 2015 at 2:55 PM, Siegfried Jachmann <siegfried@jachmann.org> wrote:
You may want to re-think putting the filter ahead of the wedge. My ND3 and solar spectrum filters are behind the wedge.
I find using just the ND3 filter is too bright. If you want white light you may want to use an additional 12.5% filter. I consider the green solar spectrum filter also as "white" light. But id you want really white "white" light use just a series of ND filters.
participants (2)
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Chuck Hards -
Siegfried Jachmann