Canon Rumors General > Australia
ND filters
neuroanatomist:
--- Quote from: gmrza on December 07, 2011, 05:53:04 PM ---You probably would be shooting with the aperture stopped down as well to get sharper images and reduce vignetting (mainly an issue with the 24-105 on full frame however), so you probably would not want to bother with using a ND on a fast prime. As neuro said, you can also get adapter rings.
--- End quote ---
For landscapes, true. Also true for a 10-stop filter.
But another common use of ND filters is when using fast primes for outdoor portraits - on a bright day, at f/1.2 even 1/8000 s may not be short enough. Also, using even f/2.8 on a bright day where you want to use fill flash will result in overexposure if you're limited to your max sync speed - so, you can either use HSS if your flash supports that (and blow through your batteries), or use an ND filter to knock down the light (as long as you have enough flash power).
In addition to my usual 82mm and 77mm filters, I have a 72mm 3-stop ND for outdoor portraits - it's great that the 35L, 85L, and 135L all use a 72mm filter...
gmrza:
--- Quote from: neuroanatomist on December 08, 2011, 01:07:38 PM ---
--- Quote from: gmrza on December 07, 2011, 05:53:04 PM ---You probably would be shooting with the aperture stopped down as well to get sharper images and reduce vignetting (mainly an issue with the 24-105 on full frame however), so you probably would not want to bother with using a ND on a fast prime. As neuro said, you can also get adapter rings.
--- End quote ---
For landscapes, true. Also true for a 10-stop filter.
But another common use of ND filters is when using fast primes for outdoor portraits - on a bright day, at f/1.2 even 1/8000 s may not be short enough. Also, using even f/2.8 on a bright day where you want to use fill flash will result in overexposure if you're limited to your max sync speed - so, you can either use HSS if your flash supports that (and blow through your batteries), or use an ND filter to knock down the light (as long as you have enough flash power).
In addition to my usual 82mm and 77mm filters, I have a 72mm 3-stop ND for outdoor portraits - it's great that the 35L, 85L, and 135L all use a 72mm filter...
--- End quote ---
I have to admit I was thinking totally in "landscape mode" - which is the main use for a 10 stop ND. I would agree about the 72mm 3 stop - as its use is mainly for portraits. On a crop frame body, a 58mm may be a good idea for use with a 50mm f/1.4. My 3 stop ND is still a square Cokin (from film shooting days) so I just need the appropriate size ring for each lens. Those are a lot more cumbersome to work with though. - For my wife's work, Cokin filters aren't an option as she doesn't have the time to mess with them, but then she finances my gear addiction. 8)
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