Re: [Utah-astronomy] Utah-Astronomy Digest, Vol 172, Issue 4
Yes, Joe, and much appreciated. I misspoke. I meant to be addressing 'Sun Parties' as there are many opportunities for weeknight sky viewing. Maybe I can fit a telrad filter and an eyepiece filter into a borrowed Dob? Is this possible and if not, maybe not the right way to go about viewing the sun in a Dob due to its major light collecting bucket function! Thanks, Shoshana
Hi Shoshana; Let me jump in here and strongly warn against using an eyepiece filter to view the sun. It is much safer to use a full aperture filter. Especially with a larger aperture dobsonian, so much light is concentrated at the eyepiece that if an eyepiece filter alone is used, all that light energy can cause the filter to fail and therefore do damage to your viewing eyeball. A proper solar filter which covers the aperture of the telescope will filter the sunlight to safe levels before it is focused. Safe solar observing! Mat -----Original Message----- From: Utah-Astronomy [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Sue Ellen Ebertz Sent: Thursday, June 08, 2017 5:07 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Utah-Astronomy Digest, Vol 172, Issue 4 Yes, Joe, and much appreciated. I misspoke. I meant to be addressing 'Sun Parties' as there are many opportunities for weeknight sky viewing. Maybe I can fit a telrad filter and an eyepiece filter into a borrowed Dob? Is this possible and if not, maybe not the right way to go about viewing the sun in a Dob due to its major light collecting bucket function! Thanks, Shoshana _______________________________________________ Utah-Astronomy mailing list http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Send messages to the list to Utah-Astronomy@mailman.xmission.com The Utah-Astronomy mailing list is not affiliated with any astronomy club. To unsubscribe go to: http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Then enter your email address in the space provided and click on "Unsubscribe or edit options". This message and any attachments are solely for the use of intended recipients. The information contained herein may include trade secrets, protected health or personal information, privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you are not an intended recipient, you are hereby notified that you received this email in error, and that any review, dissemination, distribution or copying of this email and any attachment is strictly prohibited. If you have received this email in error, please contact the sender and delete the message and any attachment from your system. Thank you for your cooperation
Mat is 100% correct. Eyepiece solar filters are no longer considered safe- by anyone. Don't use it. Another option that I use is a Lunt Hershel wedge, with a ND filter and an IR/UV blocking filter. I use the wedge for 4" and smaller refractors, anything larger should have a full-aperture filter. On Thu, Jun 8, 2017 at 6:27 PM, Hutchings, Mat < mat.hutchings@siemens-healthineers.com> wrote:
Hi Shoshana;
Let me jump in here and strongly warn against using an eyepiece filter to view the sun. It is much safer to use a full aperture filter.
Especially with a larger aperture dobsonian, so much light is concentrated at the eyepiece that if an eyepiece filter alone is used, all that light energy can cause the filter to fail and therefore do damage to your viewing eyeball. A proper solar filter which covers the aperture of the telescope will filter the sunlight to safe levels before it is focused.
Safe solar observing!
Mat
-----Original Message----- From: Utah-Astronomy [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Sue Ellen Ebertz Sent: Thursday, June 08, 2017 5:07 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Utah-Astronomy Digest, Vol 172, Issue 4
Yes, Joe, and much appreciated. I misspoke. I meant to be addressing 'Sun Parties' as there are many opportunities for weeknight sky viewing.
Maybe I can fit a telrad filter and an eyepiece filter into a borrowed Dob?
Is this possible and if not, maybe not the right way to go about viewing the sun in a Dob due to its major light collecting bucket function!
Thanks, Shoshana
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This message and any attachments are solely for the use of intended recipients. The information contained herein may include trade secrets, protected health or personal information, privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you are not an intended recipient, you are hereby notified that you received this email in error, and that any review, dissemination, distribution or copying of this email and any attachment is strictly prohibited. If you have received this email in error, please contact the sender and delete the message and any attachment from your system. Thank you for your cooperation
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I would not use a Dob as a solar scope! Too dangerous! Sent from my iPhone
On Jun 8, 2017, at 5:06 PM, Sue Ellen Ebertz <ebertzs@comcast.net> wrote:
Yes, Joe, and much appreciated. I misspoke. I meant to be addressing 'Sun Parties' as there are many opportunities for weeknight sky viewing.
Maybe I can fit a telrad filter and an eyepiece filter into a borrowed Dob?
Is this possible and if not, maybe not the right way to go about viewing the sun in a Dob due to its major light collecting bucket function!
Thanks, Shoshana
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Send messages to the list to Utah-Astronomy@mailman.xmission.com
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participants (4)
-
Chuck Hards -
Hutchings, Mat -
Joe Bauman -
Sue Ellen Ebertz