General > General Technical Chat

Eclipse watchers in America on April 8th.

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Gyro:
If I'd realized the next total eclipse in the UK is 2090, I'd have made more effort to join the rush to Cornwall in 1999. :(

BrokenYugo:

--- Quote from: jpanhalt on April 07, 2024, 12:27:03 pm ---In the US, our "experts" have warned that welding helmets should be avoided, because they are often "not dark enough."  Mine happen to be shade 11 for small electrodes and less than 250A; the experts say at least a 12 is needed.  My store-bought eclipse glasses are a little darker than my helmets are.


--- End quote ---

Yeah, I'd say 12-14 based on some halfass testing I did with an auto darkening helmet today. On a clear dry sunny day near noon #11 was blown out and would have you seeing a spot if you stared, 12 was marginal, 13 (max) was dim enough I could see some irregularity on the surface, probably about right.

jbeng:

--- Quote from: jpanhalt on April 07, 2024, 12:27:03 pm ---... the experts say at least a 12 is needed.
--- End quote ---

I have a #12 filter plate, which I find works pretty well; it makes the sun appear a monochrome gray.  I also have a piece of the standard solar film which makes the sun appear orange, as the viewer glasses do.  I don't really like using the orange filter though, as I've never been able to get a sharp image.  The edge of the solar disk always has a fuzzy appearance regardless of settings.

My setup is a Canon 7D body, a 250mm lens + 2x converter and the filter plate.  The settings I've used for a reasonably sharp image are: 1000 ISO, f25, 1/400th sec, manual focus.  I can easily see sunspots on the solar disk with those settings.

For the 2017 total eclipse in southern Illinois USA, I removed the filter during totality and was able to see red solar prominences embedded in the corona.  I'm hoping to see/shoot comet 12P/Pons-Brooks during totality as well; it should appear near Jupiter.

Ground_Loop:

--- Quote from: jpanhalt on April 07, 2024, 12:27:03 pm ---In the US, our "experts" have warned that welding helmets should be avoided, because they are often "not dark enough."

--- End quote ---

How did we ever survive without the phrase “experts say.”

PwrElectronics:
 A person in my office that sits near in the cube farm took a couple vacation days and went to I think Arkansas to see it.  Will find out later this week how it was.

I don't even expect to see a partial here as its cloudy and rainy.  The last partial in 2017 it was clear skies so some effect could be seen.

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