10 stop ND filter ok for sun?
PhotoCamel: Your friendly photo community, with free discussion forums, digital photography reviews, photo sharing, galleries, downloads, blogs, photography contests, and prizes.
 

Go Back   PhotoCamel - Your Friendly Photography Forum > Cameras and Lenses > Other Cameras and Lenses

Reply
 
LinkBack Thread Tools Display Modes
Old 10-22-2014   #1
Bactrian
 
wildmaven's Avatar
 
Location: Ridgecrest, CA
Posts: 2,179
CamelKarma: 3038224
Editing OK?: Yes
Constructive Critique?: Yes
Default 10 stop ND filter ok for sun?

As the title says, is such a filter ok for solar photos?

__________________
Members don't see ads in threads. Register for your free account today and become a member of PhotoCamel to open up the site's many benefits and features.
__________________
Wildmaven Art and Photography
wildmaven is offline   Reply With Quote
Old 10-22-2014   #2
F1 Camel
 
Tat2Duck's Avatar
 
Location: CT, USA
Posts: 2,505
CamelKarma: 6617978
Editing OK?: No
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

While I can not answer that question, I have heard of people using the glass shield from a welder's helmet. Maybe that can lead to some answers.
Tat2Duck is offline   Reply With Quote
Old 03-16-2015   #3
F1 Camel
 
Golem's Avatar
 
Posts: 2,791
CamelKarma: 683702
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

No. 10EV is just NOTHING ....

You know those mirror coated plastic
bags such as computer parts ship in ?
Not the barely silvered ones, but the
fully mirrorized ones ? Multiple layers
of that stuff would be safe. Someone
might chime in below that this stuff
is not "optical grade". That claim is:
A. Accurate
B. A big "so what?"
C. Both of the above

Answer:
"C. Both of the above"

Dense dyes do not make great sun
filters, but metalized surfaces do.



`
Golem is offline   Reply With Quote
Old 03-17-2015   #4
PhotoCamel Supporter DONATED
Bactrian
 
Jim Jones's Avatar
 
Location: Rural Missouri
Posts: 2,341
CamelKarma: 501383
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

I've used crossed polarizers to shoot solar eclipses.
Jim Jones is offline   Reply With Quote
Old 03-18-2015   #5
F1 Camel
 
Golem's Avatar
 
Posts: 2,791
CamelKarma: 683702
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by Jim Jones View Post
I've used crossed polarizers to
shoot solar eclipses.
Wowza ....
that seems like the perfect tool !

I just KNOW someone is gonna say that
will screw up your AF or your metering,
but we'll just pretend they are speaking
Ancient Babylonian, or Punk Rock.

`
Golem is offline   Reply With Quote
Old 03-18-2015   #6
Guanaco
 
Posts: 477
CamelKarma: 322787
Editing OK?: No
Constructive Critique?: No
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by wildmaven View Post
As the title says, is such a filter ok for solar photos?
Online sources say everything from a welder's filter at shade 10 to shade 14, bt more suggest shade 14.

I measured a Shade 8 at 12 stops; shade 10 is about 14 stops, and it blocks UV and IR, which an ND filter might not. Even if enough visible light is blocked, the UV / IR could fry your retina immediately while looking through the viewfinder.

So I think it would be unsafe.

If you do use a welder's filter, they have a brutal green tint, more than can be removed in LR. Some editing programs can manage it.
serendipitous is offline   Reply With Quote
Old 03-19-2015   #7
F1 Camel
 
Golem's Avatar
 
Posts: 2,791
CamelKarma: 683702
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by serendipitous View Post
Online sources say everything
from a welder's filter at shade 10 to shade 14, bt more suggest
shade 14.

I measured a Shade 8 at 12 stops; shade 10 is about 14 stops,
and it blocks UV and IR, which an ND filter might not. Even if
enough visible light is blocked, the UV / IR could fry your
retina immediately while looking through the viewfinder.

So I think it would be unsafe.

If you do use a welder's filter, they have a brutal green tint,
more than can be removed in LR. Some editing programs can
manage it.
Complete agreement especially concerning the section I've
underlined. OTOH, what might happen, or could probably
happen, whilst looking THROUGH the viewfinder shouldn't
even be under discussion. Looking THROUGH the viewfinder
implied a completely optical viewing system, the very use
of which is absolutely verboten regardless of filters.

No matter how badly one might screw up and possibly ruin
a sensor or viewing screen, including the mini screen thaz
in a mirrorless camera's eyepiece viewfinder, all you need
is a new camera body. Your eyes are protected. You're just
watching an image of the sun "on TV" ..... but you are NOT
watching the sun itself. The live view function of an SLR is
virtually as safe, since it's not at all an optical viewfinder.

OK, just to be extreme, worst case but ridiculously highly
unlikely scenario, you would be looking at your solar event
on the rear LCD and the solar image melts a hole in the
sensor and a hole right thru the LCD and is now gleaming
directly from the camera lens ... thru those holes ... into
your eye. Fortunately, the image would not be sharply
focused cuz your eye is not in the plane where the sensor
had been ... but small comfort, huh ?

Well, the worst case scenario is simply not really gonna
happen, but even if it did, you'd be saved if you were
looking thru the eyepiece viewfinder, cuz it's not lined
up behind the camera lens and so out of the line of fire.

So, it's not question of which filter allows you to safely
view thru an optical finder, but a question of which filter
works image-wise and sensor-wise. Viewing THROUGH an
optical finder is simply not an option. Reports from those
who have successfully done it have no bearing other any
other persons. Miscommunication is rampant and the risk
is just too intolerable. Yes, I really HAVE seen the sun
directly thru a certain expensive little telescope wearing
its expensive sun filter. I will not name the brand cuz I'd
be communicating a possible way to violate my own
advice by recommending gear. Even tho that gear was
safe and I was unharmed, I would not view thru the same
gear again today, even tho it is recognized as the best.
But I would, with no worry, hook my camera up to that
same rig for image capture !

The OP asks about filters for solar photos. Those exist.
But solar photos is not the same pursuit as solar viewing.
Direct solar viewing is too risky. Viewing by proxy image
is the reliably safe route.


`
Golem is offline   Reply With Quote
Old 03-19-2015   #8
Bactrian
 
wildmaven's Avatar
 
Location: Ridgecrest, CA
Posts: 2,179
CamelKarma: 3038224
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by Golem View Post
The OP asks about filters for solar photos. Those exist.
`
Yup, that's what I was asking.
__________________
Wildmaven Art and Photography
wildmaven is offline   Reply With Quote
Old 03-19-2015   #9
F1 Camel
 
Golem's Avatar
 
Posts: 2,791
CamelKarma: 683702
Editing OK?: Yes
Constructive Critique?: Yes
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by wildmaven View Post
Yup, that's what I was asking.
In your shoes, first advice I'd activate is the
crossed polarizers. FWIW the reason I went
off into the hazard of improper viewing is
that certain posts seemed as if they might
result in risky behavior and people really do
take such risks and then suffer serious injury.

BTW, if you have access to a mirror lens a
special advantage applies. Because the axis
doubles back on itself, the front element is
located behind [closer to sensor] than the
optical center. IOW, the iris blades, if such
lenses had any, would be at, or near, that
front element.

What the above offers us is freedom to put
a smaller aperture in place simply as a "lens
cap" with a hole in it. The cap can block off
most of the front "donut" leaving just a hole
open. The hole is NOT concentric to the lens
barrel. No need for that with these lenses.
The hole sits anywhere along the donut and
the center of the hole is half way from the
edge to the blackout spot [backside of the
small front end mirror.

A typical f/8 mirror lens is about T/10. If the
diameter of the hole spans from the edge all
the way to blackout spot, the lens will then
be about T/40. Off course, you can make the
hole smaller, and you can add filter sheets
over the hole. Do NOT rely SOLEY on filters
in the rear of the lens. There could be enuf
heat build-up at that location to crack that
filter [assuming no light attenuators mounted
on the front of the lens].

`
Golem is offline   Reply With Quote
Old 03-20-2015   #10
Guanaco
 
Posts: 477
CamelKarma: 322787
Editing OK?: No
Constructive Critique?: No
Default Re: 10 stop ND filter ok for sun?

Quote:
Originally Posted by wildmaven View Post
Yup, that's what I was asking.
okay then.
Solar Filters
Orion Telescopes: Search Results on 'solar filter'
Shop at OPT - White Light Filters - Solar - OPT Telescopes


__________________
Members don't see ads in threads. Register for your free account today and become a member of PhotoCamel to open up the site's many benefits and features.
serendipitous is offline   Reply With Quote
Reply

« PhotoCamel - Your Friendly Photography Forum > Cameras and Lenses > Other Cameras and Lenses »


Share this topic:

Thread Tools
Display Modes