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P-FLAT 4 with ED80
has anyone used the william optics p-flat 4 flattener with an ED80. I am going to be using it with a canon 550D, and am wondering how it performs - specifically in regards to vignetting?
I am currently using the orion flattener/reducer that screws directly onto the drawtube. It provides a great secure mount, but there is nowhere to put my lovely 2" IDAS LPS filter
Cheers
Adam
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