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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses
Thread started 18 Jul 2007 (Wednesday) 11:57
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Solar filter for solar photography?

 
Grimm75
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Jul 18, 2007 11:57 |  #1

Does anyone know of solar filters that can be used to photograph the sun? There are plenty out there for telescopes but I've not seen any for actual solar photography on DLSR cameras alone (without telescopes). Just curious.


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asylumxl
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Jul 18, 2007 12:00 |  #2

Hoya makes an insane ND which may be usable for this purpose. It's called ND x400 i believe. Could always stack them lol.

http://www.hoyafilter.​com/products/hoya/oef-07.htmlexternal link <--heres a link.


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Grimm75
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Jul 18, 2007 12:04 |  #3

Actually, the second photo on that page, the one showing the sun is exactly what I was loking for. Thanks!


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pwm2
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Jul 18, 2007 12:06 |  #4

B+W has a ND 3.0 that is 1000x.

Just remember that the ND filters may not block IR or UV radiation to the same degree, so it may still be dangerous to look in the view finder and potentially harmful for the camera sensor.


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Sathi
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Jul 18, 2007 14:18 |  #5

Anyone have any examples of sun shots? The sun is about the same size as the moon from our prespective right? So you would need like 1000mm focal length to get an up close pic?


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Grimm75
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Jul 18, 2007 14:37 |  #6

Ok, I spoke Hoya, the NDx400 does allow for safe shots of the sun without camera sensor damage however, it is NOT for viewing. I was told it is safe to look through it long enough to compose the shot but then take your eyes away and take the shot.

So yeah, wear sunglasses and you should be ok. :)


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Grimm75
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Jul 18, 2007 14:38 |  #7

Sathi wrote in post #3568036external link
Anyone have any examples of sun shots? The sun is about the same size as the moon from our prespective right? So you would need like 1000mm focal length to get an up close pic?

I looked high and low and all I could really find were photos from DSLRs on telescopes.

I would imagine the types of shots you would get would be similar in size to moon shots. So if you have tack sharp glass and use a little USM you could crop a pretty decent photo or two.


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cspratt
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Jul 18, 2007 15:32 |  #8

Try here:

http://www.thousandoak​soptical.com/external link


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canon_fire
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Jul 18, 2007 15:44 |  #9

Does B&H have the Hoya NDx400? I am not able to find it on their site ...

EDIT: N/M , found them ......




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pwm2
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Jul 19, 2007 05:27 |  #10

Safe viewing - but still hurtfull - when looking directly at the sun without camera or telescope is normally around 0.1%. The Hoya filter is marginally in that range (for visible light) and with a camera lens the filter factor is much too low for viewing. And that is still under the assumption that the ND400x has the same amount of filtering of UV and IR. UV is normally trivial to block, but IR is not!!!

Hoya doesn't seem to give any info about their ND400x - they name it 400x but their text says 500x.

B+W do speicfy the transfer function for their filters. The filter 110 (1000x) are recommended for photographing glowing metal and similar.

The filter 113 (10,000x) for photographing the sun.

The filter 120 (1000,000x) for longer exposures.

They specifically say that the filters may not be used for viewing, since they do not block enough IR.

Be very careful!


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Grimm75
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Jul 19, 2007 06:43 |  #11

Now that's a bit better. Think I'll give them a call and see what they can tell me.

Thanks!


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billh101
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Jul 19, 2007 07:34 |  #12

Grimm75 wrote in post #3567133external link
Does anyone know of solar filters that can be used to photograph the sun? There are plenty out there for telescopes but I've not seen any for actual solar photography on DLSR cameras alone (without telescopes). Just curious.

For plain white light photos of the sun, you can easily make your own filter. I ordered a sheet of this film which allows 0.00001 light transmission through it, for around $30.

http://www.astro-physics.com ...ries/solar_acc/astr​osolarexternal link

Make a holder that slides over the end of your lens with some cardboard and tape and you're set. Here is a shot I took with the film to give you an idea. This was through my telescope, which is a 750 mm scope. So, that will give you an idea of what you can expect for size through your lenses.

http://www.pbase.com/b​illhuegerich/image/478​27483external link

I had enough left over from that sheet to make solar filters for my binoculars too. :-)

If you google it, you'll find directions on how to put it together, but it's pretty simple. Here's an example.

http://www.jotabout.co​m ...i/astro/solar_filte​r.htmlexternal link

They just made a small aperture filter in this example, because they had a big aperture telescope. For normal lenses, I imagine you'd probably want to make the filter the same size as the lens.

If this is kind of what you are looking for, it's pretty cheap and easy to make. I wouldn't trust anything that isn't make for looking at the sun through. I have viewed the sun without magnification through #14 welders glass ($6), but even that was pretty bright and probably not entirely safe to my eyes.


Bill
www.pbase.com/billhueg​erich

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asylumxl
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Jul 19, 2007 07:59 |  #13

billh101 wrote in post #3572499external link
For plain white light photos of the sun, you can easily make your own filter. I ordered a sheet of this film which allows 0.00001 light transmission through it, for around $30.

http://www.astro-physics.com ...ries/solar_acc/astr​osolarexternal link

Make a holder that slides over the end of your lens with some cardboard and tape and you're set. Here is a shot I took with the film to give you an idea. This was through my telescope, which is a 750 mm scope. So, that will give you an idea of what you can expect for size through your lenses.

http://www.pbase.com/b​illhuegerich/image/478​27483external link

I had enough left over from that sheet to make solar filters for my binoculars too. :-)

If you google it, you'll find directions on how to put it together, but it's pretty simple. Here's an example.

http://www.jotabout.co​m ...i/astro/solar_filte​r.htmlexternal link

They just made a small aperture filter in this example, because they had a big aperture telescope. For normal lenses, I imagine you'd probably want to make the filter the same size as the lens.

If this is kind of what you are looking for, it's pretty cheap and easy to make. I wouldn't trust anything that isn't make for looking at the sun through. I have viewed the sun without magnification through #14 welders glass ($6), but even that was pretty bright and probably not entirely safe to my eyes.

why not get a sheet and cut it to fit a cokin filter holder :)?


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billh101
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Jul 19, 2007 08:25 |  #14

asylumxl wrote in post #3572575external link
why not get a sheet and cut it to fit a cokin filter holder :)?

You'll need it to be pretty much light tight so you don't get stray light in from the sides.

Also, keep in mind that you will only see white light. So, you will not see flares or prominences, just the disk and sunspots. If you want flares and prominences, then you're looking at an Ha filter, and you won't find any cheap solution for that one.


Bill
www.pbase.com/billhueg​erich

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Grimm75
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Jul 19, 2007 08:32 |  #15

Great info, thanks! Do you know of anywhere that actually makes Ha filters for DSLR's though?


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