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Thread started 06 Apr 2011 (Wednesday) 19:32   
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Jon
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FILTER FAQ

-= PROTECTIVE FILTERS FAQ =-
Recommendations here on filter quality and multicoating will apply to all other filter types as well.

-=What is the effect of a Polarizer Filter=-
and why it can't be replicated in PhotoShop

-=Beginner's Guide to Neutral Density Filters=-
Including solid and graduated ND filters

-=GND Buyers FAQ=-

Post #1, Apr 06, 2011 19:32:04


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Jon
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Because it's not spelled out in any of the above links:
Neutral density filters are variously reported any of three ways.
First, there's the filter factor - a filter may be 2x, 4x, 8x, . . . which is how much you need to increase the exposure time over when you're not using a filter.
Then there's the number of stops you'll need to increase the exposure - 1, 2, 3 . . . stops
Then there's the "log density" value 0.3, 0.6, 0.9 . . .
Different vendors will use their own preferred one of the above. They all work out to the same thing in the end

  • 2x, 1 stop and 0.3 all mean the same
  • 4x, 2 stops and 0.6 again all mean the same
  • 8x, 3 stops and 0.9 all mean the same
  • and at the high end, 1024x, 10 stop and 3.0 all work out to the same.

Post #2, Mar 03, 2012 16:33:39


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Stuntman ­ Mike
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Wish I had read this before ordering an 85mm filter set. :oops: *Formatt was kind enough to change the order to 100mm, just found out!*

I figured 85mm > my 77mm lenses but didn't consider the filter holder extending into the frame at 17mm on a FF sensor.

Ordered the 85mm Colby Brown Signature set to stay welded to my 17-40mm, realized that I needed the 100mm set at the 17mm end.

https://www.formatt-hitech.com ...pe---Colby-Brown~148.htmlexternal link

Informative thread!

Post #3, Dec 28, 2013 07:55:10 as a reply to Jon's post over 1 year earlier.


5DmkII | 60D | Roc 14mm f/2.8 | 17-40mmf/4 L | 17-55mm f/2.8 | Σ 35mm f/1.4 | 40mm f/2.8 | 50mm f/1.4 | 70-200 f/4 L | 70-200 f/2.8 L II | 70-300mm f/4-5.6 | 135 f/2 L | 2X EF III
Flickrexternal link | Gear

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Augphoto
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Hello to all.

I hope this subject hasn't been covered before.

I am ecstatic because I have finally got the Big Stopper coming my way!!!

I have yet to order the foundation kit, however, or the adapter ring(s). Which brings me to my question. All of my lenses but two take a 77mm filter. The ones which do not are the 70-200 which takes a 67mm and my 100 macro which takes a 58mm filter.

So, I was going to purchase a 77mm adapter (of course) and a 67mm adapter for the 70-200, then maybe a 58mm for my macro. Whew, this is an expensive game we're in isn't it ?

Then I got to thinking. Is there ever a need for filters (including nd grads, solid nd filters, or the Big Stopper) on either the 100 macro or the 70-200 zoom. I obviously want them for my wider lenses but does anyone find a use for them on longer lenses as well ?

Now, if I may bother you with a secondary question or questions. I see that Lee sells an expensive polarizer for the front of the foundation kit. I like polarizers but I've read that some won't use them with wide-angles anyway because they make the sky uneven. Do any of you experience this issue? Do you even both with a polarizer when using grads, etc ? If you do use them, do any of you use a polarizer other than the Lee on the front of the foundation kit ?

I ask this later series of questions because I already own a B + W 77 MM (MC) Kaesemann Circular Polarizing Filter which I love and paid good money for. Would I not be able to use this with the Lee System ? It is only a 77mm filter thread after all. Is there no way to make it work ? Or, again, would it even pay to use one ?

In case it matters, I am using Canon equipment. Specifically the 7D but do plan on purchasing a full frame body in the future. Currently my widest lens is a 17-40.

Thanks, for bearing with me on my long post and I thank everyone in advance for responding. As you can see, I am not well-versed in this filter stuff so, if anyone has any other tips or knowledge on this system or things I should know, please chime in.

Post #4, Feb 21, 2014 20:28:07


Cameras - 7D, 5D MkIII Lenses - 100mm f2.8L Macro IS USM, 100-400 f4.5-5.6L IS USM, 17-40 f/4L USM, 24-70 f/2.8L USM, 24-105 f/4L IS USM 70-200 f/4L IS USM, also a Canon Extender EF 1.4 III
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