Center filter needed for 90mm5.6XL ?

I recently got a s 90mm5.6XL I only intend to use it on a 4X5 for landscape work, do I need be concerened with a center filter.

I shoot 4x5 landscapes without using a cf on a 90/4.5. I don't encounter enough fall off problems to warrant a cf for that lens, even when using RVP. But there _is_ some visible marginal fall off, and I always keep that in mind when composing, especially when using a lot of shift or rise. Your shooting habits may differ from mine, and so might your sensitivity to fall off.

 

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At the 90mm focal length for 4x5, some landscape photographers use a cf and some don't. Since you already have the lens, I suggest you just try it and critique your results without the cf. It's your call.

See also "What is the story with center filters?", http://www.greenspun.com/bboard/q-and-a-fetch-msg.tcl?msg_id=0007xb

 

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As you've already got the lens, you can judge the results you get. Is there too much fall-off for your purposes? If not, then don't worry about it.