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  #11  
Old 15th April 2014, 07:47 AM
Lostlabours Lostlabours is offline
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Originally Posted by DaveP View Post
I've definitely got some colour medium format slides where I used a Cokin 3 stop grad with a terrible magenta cast, which was then accentuated by Velvia. Their 2 stop grad seemed OK. Never used their b&w colour contrast filters but they should be fine.
I've seen the same purple casts where people have used other brands of ND filters, some of it's due excessive colour shifts due to reciprocity failure.

Ian
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  #12  
Old 15th April 2014, 07:55 AM
DaveP DaveP is offline
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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.
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  #13  
Old 16th April 2014, 04:14 PM
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Graeme Graeme is offline
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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  
Old 16th April 2014, 06:36 PM
Mike O'Pray Mike O'Pray is offline
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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.

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Mike
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  #15  
Old 16th April 2014, 07:46 PM
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Martin Aislabie Martin Aislabie is offline
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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
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  #16  
Old 17th April 2014, 07:43 AM
Lostlabours Lostlabours is offline
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Quote:
Originally Posted by Martin Aislabie View Post
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
In 30+ years of using Cokin filters I've not had an issue. I shoot into the light quite regularly and I've never had a problem or lost a shot because of a Cokin filter.

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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