>From the NASA guidance on solar eclipses: "One of the most widely available filters for safe solar viewing is a number 14 welder's glass, available through welding supply outlets."
Full guidance here https://eclipse.gsfc.nasa.gov/SEhelp/safety.html When we had a near total eclipse in my bit of the UK a few years ago, I used a reversed 50mm Pentax manual lens to project it. That worked pretty well. Chris On 27 April 2017 at 07:59, Richard Klein <rich...@gmail.com> wrote: > I wonder how similar the filters are to the glass used in welding masks? > Optical clarity probably isn't as important for welding masks. > > On Apr 19, 2017 4:13 PM, "John Sessoms" <johnsess...@yahoo.com> wrote: > >> Update on my preparations (if anyone is interested). >> >> Stopped by my local Pentax dealer here in Raleigh. >> >> I got a Manfrotto 700RC2 fluid head that will take my existing mounting >> plates for my 3021 legs. >> >> He ordered an Astrozap AZ-1514 Glass full aperture Solar Filter to fit >> over the lens hood of my 300mm f/2.8 (124-130mm). >> >> https://www.astrozap.com/scripts/prodView.asp?idproduct=61 >> >> I hope to be able to start practicing safely shooting the sun by next >> week to see how much of the frame I'll fill & whether or not I'm going >> to need to use the 1.4x tele-converter. I want to have enough of the >> frame filled to get some detail on the sun, but loose enough to get the >> corona & solar prominences un-cropped. >> >> I'd like to have that lens on the K-1 because of the articulated screen, >> but I'll switch it to the K-3 if I find out I need the 1.5 crop factor. >> >> -- >> PDML Pentax-Discuss Mail List >> PDML@pdml.net >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. >> > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
