Sorting through a box of old gear, I re-discovered an old shutter tester. I believe I bought it as a re-badged Calumet device, perhaps in the late 1970's? I scanned the operating aids on the body of the device in case they were of any interest to anyone as the subject has come up in recent posts. I recall the manual suggesting 3 run throughs; first from slowest to fastest, fastest to slowest and a final slowest to fastest. I had a spreadsheet that graphed out the averages and the erratic behavior of each shutter speed. This was done on a Quattro spreadsheet to give an example of the age of this activity! These testers were extremely inexpensive ($25 or so) if I recall but it seemed to be a legitimate piece of gear with logical results.
I was using Konica 35mm gear with their Seikosha bulletproof shutters, Koni Omega and Rolleiflex TLR's and I recall testing what equipment I used to not vary from expectations. The Konicas only fell off a tiny bit at the very highest shutter speeds and the leaf shutter rigs being 1/2 to 2/3 stops slow at the extreme high speeds.
I was using Konica 35mm gear with their Seikosha bulletproof shutters, Koni Omega and Rolleiflex TLR's and I recall testing what equipment I used to not vary from expectations. The Konicas only fell off a tiny bit at the very highest shutter speeds and the leaf shutter rigs being 1/2 to 2/3 stops slow at the extreme high speeds.