A friend of mine has this lens and I am trying to track down more information on this lens to help with the research.
I thought someone here may be able to shed some light on this lens.
Here is the link to the lens: https://www.wetplatedreams.com/early...tzval-300mm-f4
Also, if anyone knows of a resource to learn about the history of the Derogy lenses, please let me know.
Thank you
Larry
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