Does anyone have any experience with the R.D. Gray No. 6 periscope lens? I picked one up some time ago and just now put it on my 8x10. In fact, due to its diminutive size, I put it on my 4x5 first and then realized I did not have enough bellows.
Anyways, I have measured it to be 320mm focal length with an internal, non adjustable stop of f/16.
Please, any info on this would be great (including weather or not my measurements are correct).
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