The TT Signature lens is a single-element meniscus design that has a custom-turned barrel system that allows you to exchange elements from 9″ to 30″ in the same barrel. Literally, one lens barrel with various single elements is all that is needed. I currently own the 9″, 10.5″, 18″, 24″, and working on the 30″. You can check out my My YouTube review of this lens.
If you are a photographer or interested in learning about analog photography, we have an Analog Photography Membership Community that is the only community of its kind where you can learn and explore analog photography in depth. I also have an extensive training library of video workshops and guidebooks if you prefer to download the videos and books for offline use.
I have a dedicated Ultra Large Format Photography playlist on my YouTube Channel.