The Universal Zoom Finder is not very accurate as a composing frame for the different focal lengths, mine stays in a drawer. The extension bellows however, are a very good item to have, tucks away nicely in my backpack, as the posts come in sections and can be unscrewed. I bought mine recently off ebay very cheaply it was missing a knob. Be aware that using a copal 1 or larger shutter will require an extension lens board of about 12mm, or the shutter wont fit due to the front standard uprights hitting the shutter.
I have a few 4x5, but always go back to the trusty horseman, I have also found that the fresnel on the horseman is very good, possibly not quite as bright as the maxwell, but I can focus a lot easier with the horseman.
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