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<DIV>Dear Mark,</DIV>
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<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">Thanks for
the advice. My apologies but the lens is only 60 mm, not 90 mm as mentioned
before. When I use it for solar observation, I use the small solar opening of 38
mm (11/2\u201d) in the large lens cap along with the solar filter. It was used to
observe the entire annular eclipse that passed through the area on May 10, 1994
without incident as well as for general solar observation through the years. I
have never had any heat issues at all generated on the eyepiece even when the
image is rear projected through an eyepiece without the solar filter. Although
the filter is good, rear projection of the sun through the telescope is the best
and safest route for solar observations, especially for large groups. I have not
blinded anyone yet in the 40 years of using it in this regard. Your concerns are
noted and will be taken under advisement for the transit.</DIV>
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style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt"> </DIV>
<DIV
style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">Regards,</DIV>
<DIV style="FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: 12pt">Ron
Shields</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=mark.kaye@sympatico.ca
href="mailto:mark.kaye@sympatico.ca">Mark Kaye</A> </DIV>
<DIV><B>Sent:</B> Saturday, May 12, 2012 7:01 AM</DIV>
<DIV><B>To:</B> <A title=astronomers@hamiltonrasc.ca
href="mailto:astronomers@hamiltonrasc.ca">astronomers@hamiltonrasc.ca</A> </DIV>
<DIV><B>Subject:</B> Re: RASC Hamilton [ Special Announcement] Transit of Venus
- June 5</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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style="FONT-STYLE: normal; DISPLAY: inline; FONT-FAMILY: 'Calibri'; COLOR: #000000; FONT-SIZE: small; FONT-WEIGHT: normal; TEXT-DECORATION: none">On
12-5-12 3:26, <A class=moz-txt-link-abbreviated
href="mailto:rjshields@sympatico.ca">rjshields@sympatico.ca</A> wrote:
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I have a 90mm refractor with a solar filter that threads into the eyepiece. I
can bring it to the gathering. Have used it over the years for solar
observations and eclipses. It is what got me interested in the stars in the
first place. Hate parting with an old friend.<BR></BLOCKQUOTE><BR>
This type of solar filter is dangerous and should not be used. The only
method of solar viewing that is safe has the filter in front of the
telescope. The heat generated by the Sun hitting that filter will cause it
to break and allow the Sun through. Please do not use this eyepiece
filter.<BR><PRE class=moz-signature cols="72">--
Clear Skies!
MK
<A class=moz-txt-link-freetext href="http://www3.sympatico.ca/mark.kaye/index.htm">http://www3.sympatico.ca/mark.kaye/index.htm</A></PRE>
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