The only 300mm lens I have except for some "project" Tessar 1c's and a Heliar is a 12" Gold Dot Dagor I use mostly on 8x10. I'm keeping it because it belonged to a friend and has a nice tonality in B&W that I like and is sharp, and you can't just go out and buy one at a reasonable price most of the time. Something you have to think about with vintage lenses as you have discovered getting your 270mm G-Claron. But I doubt I'd go looking for a 12".
When I started out in 4x5, I started with a 150mm and a 210mm, the standard set. As time went by, I discovered that I saw "wide" and switched to a 135mm and 180mm set. Will you see a difference between 135mm and 150mm, or 180mm versus 210mm? Probably not in any given instance, but over time I think you'll decide you like one focal length better than the other. This also doesn't mean that in any given instance you wouldn't prefer a different focal length. But, a 270mm is the 8x10 equivalent of a 135mm on 4x5. The next step up for me is a 360mm, the equivalent of a 180mm on 4x5.
The odds are you'll like the 300 mm if you like the 150mm and 210mm, it's the natural progression and what most people are happy with. But the only way you can tell is to go shoot a lot. Don't sell before you know unless you have to.
So in short, yes you can tell a difference in small differences in focal length, but you'll have to be quite familiar with your lenses and your usual subjects.
Cheers, Steve
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