I would be concerned about the amount of energy they allow to pass. They are OK for eyes at 3-4mm aperture, but a 60mm refractor gathers 225 times more light than a 4mm eyeball, and nearly 60 times more than a constricted upil. Brent --- Richard Tenney <retenney@yahoo.com> wrote:
Okay, any reason why these wouldn't make GREAT solar filters for small refractors? When a 60mm filter from Orion costs nearly $60... thoughts anyone? -Rich
--- Joe Borgione <jborgion@xmission.com> wrote:
Check around with other welding supply stores; Norco carries the larger size, but they were out of them at the time I went there. The size is about 4 x 5, which is the size of the #12 I bought.
Joe Borgione
Richard Tenney wrote:
Does anyone know if the glass ever comes in a larger size? I thought I had seen welder's masks with a larger faceplate than the 2x4. -Rich
--- Joe Borgione <jborgion@xmission.com> wrote:
Jim, et al-
I purchased 2" x 4" #14 welders glass from Norco, a welding supply company in Salt Lake City. They are located at 2006 West, 1500 South, just south of the Sap Brothers truck stop at I-215 & California Ave. When I was there (friday, 5/31) they had a couple dozen in stock.
Joe Borgione
Jim Stitley wrote:
Joe, WHERE did you buy these? Locally? For the $1.50 price each??? Thanks, Jim Stitley
--- Joe Borgione <jborgion@xmission.com> wrote:
This list always provides the best advice; After purchasing the #12 lense, I made a couple of phone calls and found a place that had #14s and for $1.50 apiece I bought 3 and framed them individually in some cardboard. By the time I tested them on the naked eye sunspot, it was up at about the 10:00 position on the disk.
Bring on the eclipse!
Joe Borgione
>>>fron Patrick: >Hi,
>The difference between a 12 and a 14 is the 14 is safe for looking at the Sun >while the 12 is not. I would recommend you NOT use a #12 to view the Sun.
>See:
http://www.mreclipse.com/Totality/TotalityCh11.html#Welder
>Patrick :-)
>>>> From Brent:
>Joe, >I have used #12 before, and without any noticable >effect. I only used them for VERY short periods of >time. I DO NOT RECOMEND USING THEM. I have purchased >#14 glass from the welding supply shops around town >(US Welding, Gas House, etc.) You would do much >better with the #14.
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