06-29-2011, 11:11 AM
[quote name='Frank' timestamp='1309266934' post='9598']
I bought a set of 85x110mm Hitech GND filters and a P-typw Cokin filter holder. I found that the set does not work well on my AF-S 16-35mm F4 lens, which causes heavy dark shades from about 26mm downward. From the Cokin document I read that Cokin has a wide-angle holder but it appears that the wide-angle holder only works down to 20mm. According to the document, only the X-PRO series of holders can work down to the 16mm, but the X-PRO holder takes filters of 130mm width. Here I have a few questions:
1. Do I really need the huge X-PRO filters and holder for my 16-35mm lens? Is there a smaller holder that work with the lens at the 16mm end?
2. What do you do when you use square GND filters with a super-wide angle lens? Is hand-holding is a common approach?
3. If I have to hand-hold the filter, is long-time exposure a problem? Will the movement of the filter affect the quality of the image? For hand-holding, is a 85-110mm filter too smaller?
Any comments and advices are welcome.
Best regards，
Frank
[/quote]
You didn't specify what camera format you are using, though I presume it's FF.
Yes, I expect you would get vignetting at 16mm on FF.
With a Canon 10-22 on a crop camera, P-size works with a single slot, i..e this would be the wide-angle adapter.
http://photonius.wikispaces.com/Vignetting
You can make your own wide-angle adapter by just cutting off two slots.
I can't comment how well it will work for 16-35 on FF, but it should be roughly similar.
If you want more flexibility, then indeed you need to get the larger filters.
I bought a set of 85x110mm Hitech GND filters and a P-typw Cokin filter holder. I found that the set does not work well on my AF-S 16-35mm F4 lens, which causes heavy dark shades from about 26mm downward. From the Cokin document I read that Cokin has a wide-angle holder but it appears that the wide-angle holder only works down to 20mm. According to the document, only the X-PRO series of holders can work down to the 16mm, but the X-PRO holder takes filters of 130mm width. Here I have a few questions:
1. Do I really need the huge X-PRO filters and holder for my 16-35mm lens? Is there a smaller holder that work with the lens at the 16mm end?
2. What do you do when you use square GND filters with a super-wide angle lens? Is hand-holding is a common approach?
3. If I have to hand-hold the filter, is long-time exposure a problem? Will the movement of the filter affect the quality of the image? For hand-holding, is a 85-110mm filter too smaller?
Any comments and advices are welcome.
Best regards，
Frank
[/quote]
You didn't specify what camera format you are using, though I presume it's FF.
Yes, I expect you would get vignetting at 16mm on FF.
With a Canon 10-22 on a crop camera, P-size works with a single slot, i..e this would be the wide-angle adapter.
http://photonius.wikispaces.com/Vignetting
You can make your own wide-angle adapter by just cutting off two slots.
I can't comment how well it will work for 16-35 on FF, but it should be roughly similar.
If you want more flexibility, then indeed you need to get the larger filters.