I have four lenses that I have tested with a shutter speed tester. Most of the shutter speeds are as they should be apart from the 1/250 and Higher speeds. Is it common for the higher speeds to be slow by 1/2- 1 stop?
I have four lenses that I have tested with a shutter speed tester. Most of the shutter speeds are as they should be apart from the 1/250 and Higher speeds. Is it common for the higher speeds to be slow by 1/2- 1 stop?
Only one of my shutter where acurate, a Fujinon-W 210mm, sold to a man in need. Else both small and big where not up to the task of giving 1 stop shorter than the next.
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I find 1/125th and above are generally optimistic. Age of the shutter doesn’t seem to matter.
Shutter speeds are,within manufacturer’s specification if they are +\- 30% of their marked speeds.
So at which range will a shutter be most accurate aside from B and T
Normally I never have a need to shoot above 1/60 but I always shoot my Cooke PS945 (Copal 3) at the fastest speed which is 1/125. I’ll take the +/- 30% error because I have not seen anything amiss yet.
Hmm. Shutter efficiency? Remember, shutter speed testers measure the time that the shutter is open at all. At higher speeds, leaf shutters are only partially open for most of the time they're open. Jes' sayin'.
Dan is right. Checking between-the-lens shutter speeds is best done with an oscilloscope. This can also be used for checking sync timing and shutter bounce.
Not to be flippant, but after 40 years of LF photography I've never used a speed above 1/60. I would highly doubt that the faster speeds are accurate. The only one I'm sure that's not accurate at the higher speeds is my Ilex #4; it was serviced by Carol Flutot a well back and she provides a test list of all the actual speeds.
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