Because dagors consists of a pair of cemented triplets, that equates to only four air to glass interfaces total. Then if you coat that, or even
multicoat it (as with the very last series of Kern dagors), you get the highest contrast of any camera lenses ever made. When I used to shoot multicoated dagors that contrast was just too much for color chrome work. But the hue purity and microcontrast were stunning. I disliked its Compur 3 shutter due to the high vibration and lack of a T setting, so have since converted to the single-coated 360 Kern in the older 3S Copal. Still a relatively modern lens with superb color and reasonably crisp contrast, equivalent to most other modern multicoated view lenses, but not over the top. The asking price for these things is getting downright silly. .. more a cult mentality than what they're really worth compared to other options. By comparison, commercial Ektars are in huge no. 5 shutter, need big lensboards, and are much lower contrast dialytes (6.3 version), with four airspaced elements and typically a single coating. Good color rendition but a much softer look, with a huge image circle. There is a rarer 4.5 Tessar version too, but it's not labeled "Commercial". Some of the 6.3 lenses were private labeled Caltar for Calumet and sell cheaper.
These things are just too big and clunky for typical 4x5 use. If you want something relatively small but incredibly sharp, buy an Apo Nikkor
305 or 360 process lens in barrel. They're fairly compact and a relative bargain, and will easily cover 8x10, but you'll either have to use the lenscap exp technique or spend the extra bucks to put them in a Copal 3 shutter. A more common excellent performer already in shutter is the 355 G Claron. I personally use my 360 Fuji A the most. It's in a no.1 shutter and is an incredibly versatile multicoated lens. But these are hard to find and generally fetch top dollar. A 300 Nikkor M is almost on par with a dagor in terms of color and contrast, actually better in
terms of sharpness, and is quite common. But it won't give much wiggle room on 8x10. Plenty of image circle for 4x5, however, and quite lightwt and compact. But there is a 450 Nikkor M, as well as the sleeper tessar out there, the single-coated 420 Fuji L (a tad heavy for 4x5).
Lots of good choices if you don't want to smash your piggy bank. Regular 5.6 plastmats are just, well... huge and heavy, so not very popular
for field photography.