I haven't noticed any problem mounting a heavy lens, but the heaviest lens that I have is a Fujinon SW 125mm f8 that's not used very often (my Intrepid is 5x7). For 4x5 I typically carry a 135mm f5.6 Sironar N (very small lens) and a Fujinon A 240mm f8 (only slightly larger). My 4x5 is a Tachihara which is only slightly heavier than an Intrepid.
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