Jerold,
Given the two lenses that you already have, I would choose the Fuji 240A.
Call Jim at Midwest (mpex.com). I got mine from him at a reasonable price.
Another good 8x10 lens is the older Fuji 250 f6.7. Coverage spec is 398mm. Only single coated. It has it's fans.
How about a Cooke XVa? Cooke will have a batch of them ready for sale in a couple of months.
My three lens Tachihara 8x10 kit is based on the longest and shortest lenses that the bellows will accommodate plus a 300mm "normal" focal length.
The longest is a 740mm f16 achromat, middle is a Fujinon-W 300 f5.6, and the wide is a 121mm f8 Super Angulon. The big gaps between the focal lengths I make up for by "foot zooming". So far, so good.
Photography:first utterance. Sir John Herschel, 14 March 1839 at the Royal Society. "...Photography or the application of the Chemical rays of light to the purpose of pictorial representation,..".
Not all lens designs exhibit significantly expanded coverage when stopped down past f/22. Lens such as the G-Claron and Germinar W do. The Nikon M, Fuji A and Fuji C series lenses and most plasmats do not.
The wild card here is the "A" word (architecture), which traditionally imposes much more extensive coverage requirements than landscapes/nature. Your Nikon 300M is a very sharp lens, but its coverage of 8x10 is fairly tight, and the coverage of the Fuji 240A is even tighter (roughly one inch of movement before vignetting occurs). If you indeed use "a fair amount of rise and tilt," then you may have to revisit your 300mm lens choice as well as pick a wide angle. For example, the Nikon 300M and Fuji 240A definitely do not have enough coverage for traditional architectural applications.
If you back off the architecture requirement, then you have a lot of leeway for lens selection, and the previous posts have already listed a lot of good options. If you must have architecture, then you might initially try a 240mm G-Claron or 240mm Germinar W (the Germinar is slightly better in that it is multi-coated; the G-Claron is more commonly available); these lenses will have adequate coverage for architecture when stopped down, are small and light, and reasonably priced on the used market. If after working with your 8x10 system for awhile you subsequently determine that your Nikon 300M has insufficient coverage, then you can replace it with something like a Fuji 300A (420mm image circle), 305mm G-Claron or a much larger plasmat. Or you could just keep the 300M and use the 240 (and crop the negative) whenever extended coverage is required.
210mm 8x10 lenses with sufficient coverage for architecture are either rare (Graphic Kowa, Computar, Fuji W) or huge and expensive, so you are probably better off with a 240mm lens, at least for now.
Based on the original post, I would recommend either the 240 G-Claron or the Germinar-W. I have both and have used both on 8x10.
I use my Fuji 240A on my 8x10 a lot and I love this lens. You do have to be careful because you will run out of coverage real quick. 1" of movement is about right.
Jim
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