I am interested in purchasing a series of square filters (4x4 inches) for my Hasselblad ProShade. So, I would like to know if reliable and objective information exists about who makes the best filters.
On the internet I could find a number of pages and forums about filters, but no tests and reviews comparing various brands and makes.

What I found were mostly conflicting (and confusing) opinions from users and never ending debates about resin vs glass, single/multicoated vs uncoated, sandwiched gelatine vs dyed in the mass glass, cheap filters vs expensive ones, japanese vs german, real filters vs photoshop job, filters vs no filters, etc. These were users opinions or makers selling points. No definite and independent reviews and tests conducted over a large spectrum of brands.

Here is a comparison of some prices (in euros) for a particular 4x4 filter, from the cheaper up to the most expensive:

1) Van Diemen (resin):50

2) Cromatek (resin):54

3) Lee (resin):57

4) Van Diemen (glass):88

5) Harrison & Harrison (glass):97

6) Format (glass):95

7) Tiffen (glass):120

8) Schneider (glass):156.

This is not a comprehensive list (Cokin, Heliopan, Singh-Ray, HighTech, BW, among others, are missing). But that list is good enough to show that the price is tripling. So, the decider is : Are we getting what we pay for?

Thank you very much in advance for your contribution.

Arthur Delabie