Reply #10 - April 12, 2007, 11:56:35 AM
Hi Leen- When I saw the term- Vari- I assumed that we were talking about the graduated filters- those are the ones I refer to in my post. As far as a single density ND filter there are others on the market that will do the job. I do however, prefer the Sing-Ray and the B+W filters and some of the other high end brands because of their optical quality. I always though that if one invests in top of the line lenses, there is no use buying filters of a lesser quality and end up degrading the image quality because of poor optical performance of the filter.
Whenever you add a more air to glass surfaces to an optical system there is a greater chance of some quality loss due to some shortcoming in the manufacture of the filter. I like "dyed in the glass" filters because the don't de-laminate as do the ones with a colored optical plastic or gel sandwiched between to elements of glass. I have Zeiss (Hasselblad) filters for over 30 years that are still in fine shape.
I have invested in some pretty expensive polarizers as well- I need them for my architectural, commercial , and art reproduction. Theses to have given me years of service and have never introduced any optical distortion or loss of sharpness.
I don't consider myself an equipment freak by any means and I improvise when I can- especially for odd jobs that I don't get all the time but when it comes to things that I place between the sublet and the front element of my lenses, I am very discriminating.
I am sorry that I want on about a filter that was not mentioned in the original post but I hope this information is useful to someone out there.
Best regards, Ed Shapiro

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Ed Shapiro
The Hintonburg Studio
Suite 201 78 Hinton Avenue North
Ottawa, Ontario CANADA K1Y 0Z8
613-792-4837 Email:
edshapiro@rogers.com