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FORUMS Photo Sharing & Visual Enjoyment Still Life, B/W & Experimental 
Thread started 15 Oct 2009 (Thursday) 10:31
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Welding Glass (£1/$1 ND Filter) Exposures

 
apixelintime
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Jun 15, 2012 08:54 |  #1996

Just be careful - warp the filter frame just a little and it will lock on your lens...

Check to see if one side of the filter has a little retaining ring. Some have them. Remove it and the glass will pop right out...


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Jun 15, 2012 09:41 |  #1997

apixelintime wrote in post #14582686 (external link)
Just be careful - warp the filter frame just a little and it will lock on your lens...

Check to see if one side of the filter has a little retaining ring. Some have them. Remove it and the glass will pop right out...

Thats a good point, never new about the retaining ring .... learned my one thing for the day time to go enjoy the little bit of sun we have here today :D




  
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c2thew
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Jun 15, 2012 12:34 |  #1998

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just finished dremmeling off the fingers that hold the filters.
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An 82mm ring adapter just fits the height of the welding filter which is a plus.
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Below are 3 sample cokin setups that i purchased on ebay. These would be the sample variations from cokin holders to show the potential light leak issue when using this welding filter for long exposures.

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Light leak issue that i was mentioning with the cokin filter. YOU might not see that little space inbetween the cokin filter and the ring adapter, however light will leak into the lens/welding filter and will create a purple flare to the image.

I did dremmel the cokin filter holder however before i go ahead and gorilla glue the filter to the cokin adapter, i've been thinking about just gluing the filter to the ring adapter directly to prevent ANY light leak issues. The only problem with that is that in order to focus, I would have to take off the welding filter, live view x 10, then screw back in the filter and shoot. I like having the ability to pop the cokin holder on and off, but the light leak issue could be a major concern. Perhaps some electrical tape for that gap might work?

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c2thew
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Jun 15, 2012 12:46 |  #1999

stetzam wrote in post #14428452 (external link)
after a long time I managed to have my glass cut and fitted in a Cokin holder.

QUOTED IMAGE

look toward the top middle of this image at the purple flare, just as an example of how light leaking can be an issue with this filter.


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Jun 15, 2012 14:13 as a reply to  @ c2thew's post |  #2000

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Jun 15, 2012 22:10 |  #2001

apixelintime wrote in post #14582686 (external link)
Just be careful - warp the filter frame just a little and it will lock on your lens...

Check to see if one side of the filter has a little retaining ring. Some have them. Remove it and the glass will pop right out...

Well I tried to remove the retaining ring with a chisel but that would have taken hours, So I pretty much just used the hammer approach and it worked out perfectly! I'll try to post some sample pictures in the next week or two just figuring out all the settings and the white balance.


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Jun 16, 2012 00:54 |  #2002

Viperr wrote in post #14584176 (external link)
QUOTED IMAGE

You seemed to pull back pretty natural colours in this one.


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Jun 16, 2012 18:16 |  #2003

Alrighty then. I decided to glue the step ring directly onto the glass filter using gorilla glue rather than gluing it to the cokin filter holder. This results in better light leakage control. however, Once i mounted the filter on the lens and did the custom white balance using the coffee filter, I realized that what causes the purple flaring in the images is the sun hitting the glass filter itself. So if the shade is not covered even on the sides, there will be purple flaring. I suppose the work around is to use a dremmel and cut off the filter to make it smaller, however I'm worried that the dremmel might fracture the welding filter due to the vibration.

step 1: white balance using the coffee filter 30sec, f/2.8 16mm, iso 200 3pm in the afternoon shade 11 filter

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The resulting white balance after setting it to custom
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Purple flaring resulting in the sun hitting the sides of the welding filter even though the lens was not pointed at the sun.
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By standing over the camera and casting a shadow onto the filter, the sun is no longer causing any purple fringing.
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Now to find some more interesting subjects.

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Jun 16, 2012 18:29 |  #2004

Hmmm. So what do you do with this coffee filter? Just hold it over the glass while it's exposing or do you have a better way to hold it on the filter during exposure? Also, would a regular sheet of paper work just as well?


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Jun 16, 2012 19:00 |  #2005

I think I may have answered my own question but it's starting to get too dark here for me to try it out. I'll play tomorrow. :)


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Jun 17, 2012 13:20 |  #2006

Took a dremmel diamond wheel attachment and cut around the filter. took about 20 minutes but the payoff was worth it.

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lens flare should no longer be an issue now that I can attach the hood, and then the filter afterwords. I need to do more sanding to see if i can attach the hood without taking the filter off since the filter does not clear the hood.

live view barely works which is a huge plus of not having to take off the filter to manual focus. Having a f/2.8 aperture REALLY helps.

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Jun 18, 2012 17:21 |  #2007

I decided today would be a good day to test out that coffee filter trick... Looks like it's a pretty spiffy idea. I was able to get really good color in this test shot in my back yard.

10mm @ 154 seconds, f/9, ISO 100

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Jun 19, 2012 00:31 |  #2008

CameraMan wrote in post #14597439 (external link)
I decided today would be a good day to test out that coffee filter trick... Looks like it's a pretty spiffy idea. I was able to get really good color in this test shot in my back yard.

10mm @ 154 seconds, f/9, ISO 100
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Coffee Filter Test #1 (external link) by CameraMan65 (external link), on Flickr

looks good. :cool:

I did finish rounding out the welding filter to the 82mm ring. Now there is no issue of mounting the lens hood with the 16-35mk2. I'm happy.


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Jun 19, 2012 22:08 as a reply to  @ c2thew's post |  #2009

Glass came today. Five bucks from eBay, shipped, arrived safe and sound.

Just waiting on my knockoff cokin ring and then I'll mess around with it. The ring is coming from China, so it might be another week or two, but I won't have time to mess with it until this weekend at the earliest, anyway.


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Jun 20, 2012 01:24 |  #2010

Got some ESAB glass (shade 10) from Ebay for £4 so I thought I would test it.

Pic from my window over Loch Ness at 6.30am.

27mm, 180 sec, F9, ISO 100.


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