Here's a good site to compare lenses in different formats. I set the parameters for your lens.
https://www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/#{%22c%22:[{%22f%22:18,%22av%22:%222.5%22,%22fl%22:105,%22d%22:3048,%22cm%22:%220%22}],%22m%22:0}
Flickr Home Page: https://www.flickr.com/photos/alanklein2000/albums
You might have a look at the Kodak Ektar 152/4.5 lens. A fine optic stopped down, and fast enough to have razor-thin DOF wide open.
The Fujinon 105/8 SW (old style with inside writing ) and Fujinon 105/8 NSW (outside writing, multicoated) will both cover 5x7 with reasonable movements (250mm good image circle). They can be found online in the $400 range. I have the NSW style and it is an excellent lens, 77mm filters. Not too large and heavy, relatively speaking.
I use a Xenotar 135mm f/3.5 and I have used the Zeiss 135mm as well. They are essentially the same lens and go for around the same price. Some are rather expensive but if you look around they can be had for $400-$700 bucks. You can view my work with it at https://www.bryanbirks.com/
All of the portraits on the homepage were shot with a Xenotar 135mm. I have also used the Xenotar 150mm f/2.8 but opted for the 135mm because of the price and it being a bit wider for landscapes.
As mentioned by a couple of respondents, for the same perspective you'll need something like 180mm in 4x5". The faster versions at this focal length are usually about f4.5 -- which will give you the same DOF approximately. Fujinon made three 180mm f4.5 lenses, but they were all BARREL lenses with a 56mm rear thread. The good news is that they are pretty inexpensive. There are probably similar lenses from other manufacturers.
If you want to go wider, the max f-stop will be f5.6 or smaller -- combine this smaller f-stop with a perspective that is wider, and the DOF will not be as narrow.
http://www.subclub.org/fujinon/byfl.htm
The 190 optar (tessar lenses) for the graflex SLRs are stunning. You'd need a sinar shutter to use them of course.
img904 by Jason Philbrook, on Flickr
Some Fuji 180mm tessars are options. If you go to 210mm you have tons of options. Trioplan, Fujinar, Xenar, Nikkor etc..
The lens choice is of high importance, but background choice is also important... Distance to background versus distance to subject, texture/uniformity of background, etc...
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