David, thanks for the comprehensive reply.
I am an actually a ‘legacy’ NPN member :). Have not done much photography for some time but hoping to re-ignite this hobby with some new toys and travel.
I forgot to mention that I also have the DX Nikon 10-24 for my D90. I have tried using the DX lens on my D610 and the image is acceptable at 16 mm onwards; thus there is no advantage in getting a 16-35mm FX lens which is heavier than the DX lens. The total weight of D610 (850g) and 10-24 DX lens (462g) is 1.31 kg
I am tempted get a mirrorless system to complement my DSLR gear and I am attracted to the Fujifilm system. However there is nothing much to be gained in terms of total weight X-T30 (869 g) and 10-24 f/4 (410g) of 1.28kg. The 8-16mm would be wider but it is double the weight of the 10-24 and cost twice as much!
Therefore I think a compact camera will be a more suitable supplement/backup to my D610 + 10-24Dx lens. How does the Lumix TZ200 compare to the Sony RX100? The formal has a longer zoom range of 24-360mm compared to the Sony’s 24-200mm