Want to Buy 4x5 vacuum film holder

Hi everyone, I am looking for 4x5 vacuum film holders. I do medium format astrophotography but I want to upgrade. PM me, thanks

Fdelconte, I've been fooling with 4x5 astrophotography for years. If you're inclined, you could to build your own vacuum holder. See this really old thread of mine and scroll down to posting 13. https://www.cloudynights.com/forums/topic/436086-large-format-astrophotography/. I've got a bit over here as well with a fancier film holder and a more lightweight camera setup: https://www.largeformatphotography.info/forum/showthread.php?177894-4x5-Astrophotography