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> Square filters and lens hoods. |
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#11
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Quote:
Ian |
#12
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Films like Velvia supposedly shift to the green end not magenta though during long exposure, and even with exposures of many minutes in real world conditions I've never seen any appreciable green (or magenta) shift...and I've shot a lot of long exposures.....and it'd be odd to shift only in the sky (which is what I saw using grads). This shift wasn't a true clean magenta, more a weird reddy magenta.
Anyway, I don't doubt other brands of grad do have colour shifts, but in my own tests directly comparing Cokin, Hitech, and Lee, Cokin were the worst by a country mile. |
#13
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I've used Cokin filters with black and white film, on SLRs for years, without any problems; they work well.
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#14
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Graeme and other users of Cokin, was your satisfaction with both the "ordinary" Cokin filter such as the B&W ones plus say any colour warm-up ones or was it with those plus the ND grad?
It might be that only the Grad ND filters are or are said to be affected by a cast One of our posters helped me identify what I was thinking when I questioned Cokin quality based on what I had read and that was in relation to the Grad ND filters such as used to equalise the sky/ground difference. Thanks Mike |
#15
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I thought the problem with Cokin and other Perspex filters is the fact that they are not multi-coated or even single coated.
If you shoot with landscapes with the sun behind to (at what ever angle) you have a low chance of flare. With the sun in front of you there is an increased risk of flare between all those uncoated surfaces. The filter hood just narrows the angle over which flare can occur. The deeper the hood, the less chance of flare. However vignetting becomes a problem with very wide/wide angled lenses. So, do you need a filter hood - well if you are getting flare without one - it will help. How deep should it be - well you probably need a range of depths to cover your arsenal lenses and vision angles. Martin |
#16
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Quote:
I don't use ND filters, with lenses that stop down to f64 or even f90 it's not something I need Ian |
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