That's about the situation for me too, although I've tried to avoid adding another format to the mix.
I already shoot 6.5x9cm, 9x12cm, 13x18cm, 18x24cm, 24x30cm and 30x40cm, as well as 4x5" and 5x7". And there's a 4.5x6cm plate camera and a 8x10" Gandolfi under restoration...
The 13x18cm would be the German metric equivalent of half-plate, one of my old photo books calls it "the smallest usable plate size for serious photography"
Mine is a classic "Reisekamera" or "travel camera" - rear focusing, rigid front with shift&rise on the lens board. It takes bookform plate holders.
My 18x24cm is a (probably) German made camera of what that same book calls the "Englische Type" - the kind that folds up with the lensboard inside and the ground glass exposed. The "Reisekamera" has the lens exposed and the ground glass inside, covered by the folded-up bed.
As to lenses I have - most of them. Ranging from simple meniscus through Petzval and Rapid Rectilinear trough Periskop and Doppel-Protars to modern Tessars and Plasmats, including some very nice old "thingies" like Heliars and an Amatar...
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