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Sure Paul. I used a Hoya R72 on the kit lens of my D70S. Basically I had to fiddle around with exposure a bit until I found something that worked. In this case it was 1/60 at f11 (ISO 400). There was enough light for the camera to autofocus through the filter, so I did not have to remove it to focus manually as is often necessary.
In PS I corrected levels through all channels except the main RGB channel. In the channel mixer I swapped the Red and Blue channels and that was it. Hope this helps...
In PS I corrected levels through all channels except the main RGB channel. In the channel mixer I swapped the Red and Blue channels and that was it. Hope this helps...

Yeah it does Sean, I have been using longer exposures, 5 secs at f3.5 at iso 100 so I'll try the other end of the settings. I understand swapping the channels in PS channel mixer but what do you mean by not correcting levels in the RGB channel? Do you go to the channels pallet (as opposed to channel mixer) and alter them there? And also did you use a green/custom white balance? PAul

Paul, if you go into the levels dialogue, you will see a drop-down box with the channels listed. If you adjust R, G and B independently, you have much greater control over your level. I never adjust the R,G,B midtones, just the 'Black' and 'White' points (if you can call them that). 90% of the time, this will correct your white-balance too. I think that you would be able to do the same thing by adjusting levels in the channels pallet for each channel.
I did use a green custome white balance through the filter.
Take care,
Seano
I did use a green custome white balance through the filter.
Take care,
Seano