Help with ND filter
Apr 8, 2013 17:08:56 #
I was out playing with my variable ND filter and had a few shots come out with blue in them. Is this a bad filter or was I doing something wrong.
bad
not so bad
Apr 8, 2013 17:27:26 #
Whoa! That looks bad! Is it a graduated filter? Kinda looks like it's graduated all over the place ;)
Apr 8, 2013 17:50:12 #
Apr 8, 2013 17:50:33 #
Ithink is a cheap filter,they make that blue issue in the center,is much better use one no variable unless is a good one
Apr 8, 2013 17:54:37 #
This has been covered before......... :)
I have a cheap variable ND filter and if I turn it too far I can recreate that same cross pattern. Back it off a little and it is fine.
I have a cheap variable ND filter and if I turn it too far I can recreate that same cross pattern. Back it off a little and it is fine.
Apr 8, 2013 18:15:00 #
77firebird wrote:
I was out playing with my variable ND filter and had a few shots come out with blue in them. Is this a bad filter or was I doing something wrong.
Looks like a bad filter to me.
Apr 8, 2013 21:23:46 #
77firebird wrote:
I was out playing with my variable ND filter and had a few shots come out with blue in them. Is this a bad filter or was I doing something wrong.
A varible density ND filter is essentially two circular polarizing filters. You should only use variable NDs within their recommended 2 to 8 stop range.
If you go beyond the MAX, you may experience an uneven exposure or color shift that appears as an X bar in the image.
This is more common when using higher densities on full frame cameras and at shorter focal lengths especially with lesser quality filters; however, it can be experienced with any variable ND filter on any camera and at any any focal length. Lesser quality filters may only allow a 5 stop range before a pronounced "x" bar appears.
This is a common issue its the law of physics when combining two polarizing filters; however, it can be eliminated.
First, adjust your focal length and then reduce the density (stop value) setting by rotating the filter ring until the color shift disappears.
Rather than spend $$$$ I've built my own vari-ND filters with two CPL's. It is quite easy and as long as you are mindful of the above limitations they work quite well.
Apr 8, 2013 22:02:46 #
robert-photos wrote:
A varible density ND filter is essentially two cir... (show quote)
I have the ProMaster I did not think at 65.00 bucks that it was not cheap. Did go out and do what you suggested and it work just fine.
Thank for all the comments
Apr 8, 2013 22:30:24 #
77firebird wrote:
I have the ProMaster I did not think at 65.00 bucks that it was not cheap. Did go out and do what you suggested and it work just fine.
Thank for all the comments
Thank for all the comments
Top of the line is Singh-Ray 77mm Vari-N-Trio Variable ND Filter going for ~$540 at B & H 8-)
You can DIY one for less than $20 off of eBay ;)
Apr 8, 2013 22:49:50 #
robert-photos wrote:
Top of the line is Singh-Ray 77mm Vari-N-Trio Variable ND Filter going for ~$540 at B & H 8-)
You can DIY one for less than $20 off of eBay ;)
You can DIY one for less than $20 off of eBay ;)
Care to share your plans for this?
Apr 8, 2013 23:38:15 #
jerryc41 wrote:
Care to share your plans for this?
Easy...just Google "diy varible nd filter"
Should get you over 50,000 hits. Select your flavor...video or PDF.
The best CPL's are the thinest....a bit more expensive but they work better.
Basically you take apart one CPL, reverse the glass, reassemble and put the two together.
You'll have to calibrate the min and max.
Apr 9, 2013 05:30:14 #
Apr 9, 2013 05:59:00 #
jolusanu wrote:
Ithink is a cheap filter,they make that blue issue in the center,is much better use one no variable unless is a good one
It's not a cheap filter problem; it happens even with very expensive ones..it's just what happens with variable ND filters.
When you "max them out" or come close to maxing them, AND you are using a "fairly short" lens....that's what you get....the dreaded X....
Just back it off a few stops and/or use a longer lens.
Apr 9, 2013 08:12:31 #
JR1 wrote:
Some info
Thanks for the article. :thumbup:
Those people look sooo happy.
Apr 9, 2013 08:13:45 #
robert-photos wrote:
Easy...just Google "diy varible nd filter"
Should get you over 50,000 hits. Select your flavor...video or PDF.
The best CPL's are the thinest....a bit more expensive but they work better.
Basically you take apart one CPL, reverse the glass, reassemble and put the two together.
You'll have to calibrate the min and max.
Should get you over 50,000 hits. Select your flavor...video or PDF.
The best CPL's are the thinest....a bit more expensive but they work better.
Basically you take apart one CPL, reverse the glass, reassemble and put the two together.
You'll have to calibrate the min and max.
I got 746,000 hits in .36 seconds. I guess I know what I'll be doing for the next three months. :D
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