My widest lens at this time is 90mm (on 4x5) and I have no desire for a center filter at this time.
But what if you were to use that same 90mm lens on 5x7? Then you may find a center filter necessary. Yet another reason not to build the center filter into the lens. The 110mm Super Symmar XL is one of my all time favorite lenses. I bought it originally for 4x5, and have used it on that format for years without ever feeling the need for a center filter. Once I began using the same lens on 5x7, and more recently 4x10, I found a center filter absolutely neceesary (for my needs).
Fortunately, it takes the same center filter that I use with my 80mm Super Symmar XL on 4x5. And, yet anopther reason still not to build the center filter into the lens - one filter can be used with multiple lenses.
Kerry
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