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Last edited by Greg Davis; 30-Jul-2021 at 11:47.
It's best to call KHB, their website is terrible.
I suspect the opening in the lightbox is a few mm larger for use with the 240mm lens. How are the edges of your prints with the 240mm? Too light or Ok? If you are not making huge enlargements, it may not make much difference which light box you use with the 240mm.
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