File:Sand Harbor, Lake Tahoe, CA BAADER AstroSolar Safety Film (optical density 5.0) (12556243103).jpg

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This image was made through a piece of BAADER AstroSolar™ Safety Film (optical density 5.0). It worked fabulously when I shot the Venus transit a year or two ago, using a carefully made filter holder for my lens, and shooting images of the Sun at 1/500th of a second.

But for this shoot, I intended to use it as an ultra-dense "ND" filter for very long exposures. So I cut the filter down to a size that would fit in my Chinese knock-off of the Cokin P square filter holder. I found a piece of thin card stock that would fit well in the filter slots, then carefully taped the Baader film to the card stock, within the limits of my shaky hands. Last time, my surgeon girlfriend helped me get it all taut and straight.

Unfortunately, there was enough of a gap between the card stock and the filter holder that a lot of light could leak through, so I intended to tape it all up with black vinyl electrical tape.

And of course, I left the tape in the car, so this is my result after a 30-second exposure. Color shift was not as bad as I expected, despite this certainly not being a "Neutral Density" filter. So I'll try again, and be sure to seal up all the light gaps.

An optical density of 5.0 translates to 16-2/3 stops! That's a ND100000 filter.

My, my...
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Sand Harbor, Lake Tahoe, CA BAADER AstroSolar™ Safety Film (optical density 5.0)

Author Darron Birgenheier from Reno, NV, USA

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image, originally posted to Flickr, was reviewed on 2 March 2014 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date.

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Date/TimeThumbnailDimensionsUserComment
current17:35, 2 March 2014Thumbnail for version as of 17:35, 2 March 20146,016 × 4,016 (7.56 MB)File Upload Bot (Magnus Manske) (talk | contribs)Transferred from Flickr by User:ComputerHotline

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