Pin Hole Camera for Solar Viewing?

[MooEy]

should be la, since both of us tried b4 and din get blind. i heard that method over the radio, bet many others tried too.

~MooEy~

[ykchia]

Hi folks:


do not use this developed film method for visual .... NEVER.... not recomended at all , there are always chances for people to make mistake



rgds
ykchia

[kayheem]

Hi folks:


do not use this developed film method for visual .... NEVER.... not recomended at all , there are always chances for people to make mistake

rgds
ykchia

I second what YK has said.

DO NOT USE ANY OF THE FOLLOWING FOR NAKED-EYE SOLAR VIEWING:
1. Developed film (colour)
2. Smoked glass
3. Photographic neutral density filters, polarizing filters etc

They filter out the visible part of spectrum, but it is the UV that will damage your eyes. Not going blind does not mean no damage has been done. No. 14 type (darkest) welder goggles is supposed to be OK.

Take a look at:
http://www.perkins-observatory.org/eclipsesafety.html
http://www.transitofvenus.org/safety.htm

Kay Heem

[weixing]

Hi,

They filter out the visible part of spectrum, but it is the UV that will damage your eyes. Not going blind does not mean no damage has been done. No. 14 type (darkest) welder goggles is supposed to be OK.

Yes... please do not use developed film or any dark colour filter not for solar viewing. This is what happen: when you use a developed film or any filter that do not block UV, but will dim down the sun significantly, your eye pupil will open wider, because the sun is now a lots dimer. This will cause more UV to enter your eye and will start damaging your eye.

By the way, this also applied to sun glasses.... make sure your sun glasses is UV protected, or else you eye may receive more UV than without sun glasses.

Have a nice day.

[chrisyeo]

Yes.
Chunghooi is selling baader astrosolar film for only $6.50. Can cut many pieces for a solar viewer. That is a much safer way.

Cheers
Chris

[MooEy]

colour film not safe, but b/w film should be somewhat safe. b/w film absorb uv, that's why we use uv/skylight filter with b/w film to cut down haze for photography.

but then, solar specs are quite cheap la, go buy a pair, think should feel more at ease.

~MooEy~

[Q]

I know this is a stupid advice, but I just have to say it anyways in case someone thought of it as well...
I once suggest wearing the solar specs and then using the binos to view the transit, luckily remus told me that it is dangerous as the sun rays will converge at the end of the binos making it hazardous for viewing...
Probably it will burn a hole in the solar specs, I dun know, but please try not to do that, thanks!

[Airconvent]

I know this is a stupid advice, but I just have to say it anyways in case someone thought of it as well...
I once suggest wearing the solar specs and then using the binos to view the transit, luckily remus told me that it is dangerous as the sun rays will converge at the end of the binos making it hazardous for viewing...
Probably it will burn a hole in the solar specs, I dun know, but please try not to do that, thanks!

That's true. The filter was designed to shield the sun light up to the degree expected for normal use. A bino or telescope would have increased the intensity into a small area and exceeding the protection limit of the filter.
Do take care!

rich