Sun Funnel

Talk or ask questions about the hardware used in astronomy.
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Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Sun Funnel

Post by Christopher K. » May 30th, 2012, 11:31 am

A special homemade observing device is currently being touted for the upcoming Transit of Venus and sunspot numbers. Two of the "ingredients" can be found at a hardware store--hose clamps and a black funnel (Gary Seronik recommends Lowe's Blitz Super Funnel #05034). The special component, Da-Tex screen, is available from Cousin's Video at http://store.cousinsvideo.com/95774.html.

If one wants the entire solar disk on the screen, one should divide the telescope's focal length by 43 and choose the eyepiece with a focal length closest to the answer.

More information:
Sky and Telescope, June 2012, p. 60.
http://cdn.transitofvenus.org/docs/Buil ... Funnel.pdf

Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: Sun Funnel

Post by Christopher K. » January 25th, 2014, 11:26 am

Considering the current activity and the upcoming partial eclipse in October, I was curious if anyone besides John L. has a sun funnel at this time. I would like to read reports of use with different scopes.

Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: Sun Funnel

Post by Christopher K. » October 19th, 2014, 2:26 pm

A preliminary communication with John L. indicates he'll try his best to have his telescope and sun funnel at the Burbank Soccer Complex for the partial solar eclipse. If so, we'll have six instruments there for the public.

Christopher K.
Posts: 4376
Joined: October 12th, 2009, 3:28 pm
Location: Baton Rouge, LA

Re: Sun Funnel

Post by Christopher K. » August 3rd, 2017, 5:41 pm

The Highland Road Park Observatory will have a Science Academy session called "Solar Safety" for eight- to twelve-year-olds this Saturday the 5th from 10am to 12pm. This session is placed into HRPO programming at this time to provide an opportunity for those youngsters interested in firsthand experience with the Great American Eclipse to be prepared and to be able to distinguish safe viewings of the Sun (including using sun funnels) from dangerous techniques. The cost is five dollars per in-parish child and six dollars per out-of-parish child. Limit sixteen children, but there must be at least four registered for the program to occur.

More information:
http://hrpo.lsu.edu/programs/academy.html

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